{"id":4616,"date":"2026-09-11T14:38:16","date_gmt":"2026-09-11T06:38:16","guid":{"rendered":"https:\/\/sanezenrubber.com\/?p=4616"},"modified":"2026-09-18T17:57:55","modified_gmt":"2026-09-18T09:57:55","slug":"from-a-halogen-free-flame-retardant-rubber-manufacturer-and-ul94-v0-flame-retardant-rubber-supplier-eco-friendly-flame-retardant-for-nbr-rubber-and-low-smoke-flame-retardant-rubber","status":"publish","type":"post","link":"https:\/\/sanezenrubber.com\/es\/technical-communication\/from-a-halogen-free-flame-retardant-rubber-manufacturer-and-ul94-v0-flame-retardant-rubber-supplier-eco-friendly-flame-retardant-for-nbr-rubber-and-low-smoke-flame-retardant-rubber\/4616\/","title":{"rendered":"From a Halogen Free Flame Retardant Rubber Manufacturer and UL94 V0 Flame Retardant Rubber Supplier: Eco friendly Flame Retardant for NBR Rubber and Low Smoke Flame Retardant Rubber"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><strong>Halogen\u001eFree Flame Retardant FR99RP: Achieving UL94 V\u001e0 and Mechanical Performance Balance in EPDM and NBR<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This paper systematically presents the application mechanisms and performance data of GreenThinking\u00ae FR99RP, a halogen\u001efree phosphorus\u001enitrogen intumescent flame retardant, in EPDM, NBR and other rubbers. Through a triple\u001esynergy mechanism of \u201ccondensed\u001ephase charring + gas\u001ephase radical trapping + endothermic cooling\u201d, FR99RP achieves UL94 V\u001e0 rating at 100 phr loading in a 70 Shore A EPDM formulation, while delivering a tensile strength of 9.32 MPa, a TC90 cure time of only 112 seconds, a compression set of just 31.43% (120\u00b0C\u00d724h) and a rebound resilience of 47%. Compared with the previous\u001egeneration product FR98RP, FR99RP shows comprehensive superiority in mechanical properties, processing efficiency, heat ageing resistance and long\u001eterm durability. This paper serves as a technical reference for rubber compounders in railway, electric vehicle, wire &amp; cable and other industries.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"763\" src=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-1-1024x763.png.webp\" alt=\"FR series fire retardant comply with REAXH, Rohs\" class=\"wp-image-4617\" srcset=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-1-1024x763.png.webp 1024w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-1-300x223.png.webp 300w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-1-768x572.png.webp 768w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-1-16x12.png.webp 16w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-1-500x372.png.webp 500w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-1-600x447.png.webp 600w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-1.png.webp 1222w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"766\" data-src=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-1-1024x766.png.webp\" alt=\"Vista a\u00e9rea del complejo de fabricaci\u00f3n de pol\u00edmeros Sanexin en la ciudad de Xuancheng, provincia de Anhui, China, con l\u00edneas de producci\u00f3n avanzadas y centros de I+D dedicados a retardantes de llama de la serie GreenThinking\u00ae FR.\" class=\"wp-image-4618 lazyload\" data-srcset=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-1-1024x766.png.webp 1024w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-1-300x224.png.webp 300w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-1-768x575.png.webp 768w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-1-16x12.png.webp 16w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-1-500x374.png.webp 500w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-1-600x449.png.webp 600w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-1.png.webp 1215w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/766;\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">One\u001eSentence Definition<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FR99RP is a phosphorus\u001enitrogen intumescent halogen\u001efree composite flame retardant. Through a triple\u001esynergy mechanism \u2013 forming a dense ceramic\u001elike char layer upon heating, releasing free radicals to interrupt the combustion chain reaction, and absorbing heat to lower temperature \u2013 it achieves UL94 V\u001e0 rating in various rubbers including EPDM, NBR, NR, SBR and CR, while maintaining excellent tensile strength, heat ageing resistance and low compression set. As a dedicated<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><u>&nbsp;<\/u><strong><u><strong>halogen free flame retardant for rubber compound<\/strong><\/u><\/strong><\/a>, it is engineered to meet the most demanding fire\u001esafety requirements without sacrificing functional performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Why This Happens: The \u201cImpossible Triangle\u201d of Rubber Flame Retardancy and the FR99RP Breakthrough Logic<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ethylene\u001epropylene\u001ediene rubber (EPDM), owing to its saturated main chain with unsaturation only in the side branches, exhibits outstanding weatherability, ozone resistance, UV resistance and hot\u001eair ageing resistance, and is widely used in railway sealing strips, cable jackets, automotive components and new\u001eenergy vehicle (EV) battery seals. However, EPDM has a limiting oxygen index (LOI) of only about 18%, making it a typical flammable material. Nitrile rubber (NBR), though offering good oil resistance, also suffers from insufficient flame retardancy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Traditional rubber flame retardancy has long faced a so\u001ecalled&nbsp;\u201cimpossible triangle\u201d:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flame retardant efficiency: sufficient loading to meet strict ratings such as UL94 V\u001e0<\/li>\n\n\n\n<li>Physical properties: high loadings often lead to decreased tensile strength and elongation<\/li>\n\n\n\n<li>Environmental compliance: halogenated flame retardants, though efficient, face increasingly stringent regulations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Taking conventional metal hydrate flame retardants (e.g., aluminium hydroxide ATH, magnesium hydroxide MH) as an example, their efficiency is relatively low, typically requiring 150\u2013200 phr to reach V\u001e0 rating. Such high loadings inevitably cause significant deterioration in mechanical properties and processing difficulties.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Phosphorus\u001enitrogen intumescent flame retardants (IFR) are considered one of the most promising technological routes to solve this dilemma. However, the long\u001estanding challenge has been&nbsp;interference with the vulcanisation network&nbsp;\u2013 leading to reduced crosslink density, worsened compression set and accelerated heat\u001eageing degradation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The development logic of FR99RP is precisely based on this:&nbsp;through platelet\u001etype morphology design, surface activation treatment and a precisely balanced phosphorus\u001enitrogen synergy, it achieves V\u001e0 rating while minimising negative impacts on the rubber crosslinking network and long\u001eterm durability.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Common Misconceptions<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Misconception 1: Halogen\u001efree flame retardants are just aluminium hydroxide or magnesium hydroxide.<br>ATH and MH are common halogen\u001efree types, working by endothermic decomposition and water\u001evapour release, but their efficiency is low and requires extremely high loadings. FR99RP belongs to the phosphorus\u001enitrogen intumescent family, with far higher efficiency \u2013 only 60\u2013130 phr are typically needed to reach V\u001e0.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Misconception 2: The higher the loading, the better the flame retardancy.<br>Flame retardant performance has a \u201ccritical concentration\u201d effect. Overloading not only degrades mechanical properties but may also cause agglomeration and uneven flame retardancy. In the EPDM 70 Shore A formulation, both 80 phr and 100 phr of FR99RP achieve V\u001e0, but 100 phr gives better overall performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Misconception 3: Flame retardants inevitably sacrifice compression set and sealing performance.<br>This is a long\u001eheld industry belief. FR99RP test data prove otherwise: in EPDM 70 Shore A, compression set at 120\u00b0C\u00d724h is only 31.43% \u2013 an excellent level for flame\u001eretardant rubber, meeting most sealing application requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Misconception 4: All halogen\u001efree flame retardants are automatically environmentally compliant.<br>\u201cHalogen\u001efree\u201d and \u201ccompliant\u201d are different concepts. Some halogen\u001efree products may still contain REACH Substances of Very High Concern (SVHC). FR99RP has passed independent third\u001eparty testing and meets REACH and RoHS 2.0 requirements \u2013 confirming its position as an&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>Eco friendly flame retardant for NBR rubber<\/strong><\/u><\/strong><\/a>&nbsp;y otros pol\u00edmeros.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Misconception 5: Flame retardants only affect fire performance, not production efficiency.<br>Different flame retardants have vastly different effects on cure rate. FR99RP in EPDM shows a TC90 of 112 seconds, whereas some comparative products exceed 221 seconds \u2013 meaning FR99RP can nearly halve the cure cycle, directly boosting productivity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Misconception 6: Higher LOI is always better, and LOI is the sole selection criterion.<br>This is the most common technical mistake. Although FR98RP has a higher LOI (42.3% vs. 35.4% for FR99RP), it is inferior to FR99RP in almost all key engineering metrics \u2013 tensile strength, compression set, resilience, heat ageing performance, etc. For the vast majority of engineering applications,&nbsp;UL94 V\u001e0 rating combined with excellent overall performance balance is far more valuable than chasing a higher LOI number alone.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Root Cause Analysis: Four Root Causes of Performance Degradation in Flame\u001eRetardant Rubber<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Root Cause 1: Weak Interfacial Bonding between Flame Retardant and Rubber Matrix<br>Many inorganic or organic flame retardants have limited compatibility with rubber, forming \u201cisland\u001ein\u001esea\u201d structures. Without chemical bonding at the interface, these sites become stress concentrators under dynamic loading or thermal cycling, initiating micro\u001ecracks. FR99RP employs&nbsp;platelet morphology and surface activation&nbsp;to improve interfacial adhesion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Root Cause 2: Acidic Interference of Flame Retardants with the Curing System<br>Some phosphorus\u001enitrogen flame retardants (e.g., ammonium polyphosphate APP) have a certain acidity that can interfere with accelerator activity, manifesting as abnormal scorch time (TS2) and reduced cure extent (MH\u001eML). Through its compounded design and surface treatment, FR99RP&nbsp;minimises this interference&nbsp;\u2013 in EPDM 70 Shore A, FR99RP\u001e100 gives an MH\u001eML of 13.58 lbf\u00b7in, significantly higher than FR98RP\u001e100 at 10.18 lbf\u00b7in.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Root Cause 3: Decomposition Products Accelerating Thermo\u001eOxidative Ageing<br>By\u001eproducts released by some flame retardants during curing or long\u001eterm service can catalyse thermo\u001eoxidative ageing, leading to progressive hardness increase, tensile strength loss and elongation drop. FR99RP hot\u001eair ageing data (100\u00b0C\u00d770h) show: hardness change only +3 points, tensile strength change \u001e3.54%, elongation change \u001e18.31% \u2013 all far superior to the comparison product.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Root Cause 4: Poor Structural Integrity of the Intumescent Char Layer<br>The quality of the char layer formed by intumescent flame retardants directly determines fire performance and burning behaviour. Although FR98RP has a higher LOI, it produces&nbsp;vigorous expansion and copious smoke&nbsp;during combustion; FR99RP, in contrast, forms a&nbsp;dense, intact ceramic\u001elike monolithic char layer, offering better barrier performance and cleaner combustion.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Technical Mechanism<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FR99RP belongs to the&nbsp;phosphorus\u001enitrogen intumescent flame retardant (IFR)&nbsp;family. Its flame\u001eretardant mechanism can be broken down into&nbsp;three synergistic actions:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mechanism 1: Condensed\u001ePhase Charring \u2013 Dense Ceramic Char Barrier<br>Upon heating, the phosphorus component decomposes first to form phosphoric or polyphosphoric acids. These act as&nbsp;strong dehydrating agents, catalysing dehydration, crosslinking and carbonisation of the rubber surface. Simultaneously, the nitrogen component releases non\u001ecombustible gases such as ammonia, causing the char to&nbsp;expand&nbsp;into a&nbsp;porous intumescent char shell.<br>The unique feature of FR99RP is that \u2013 unlike the loose expanded char of FR98RP \u2013 it produces a&nbsp;dense, intact ceramic\u001elike monolithic char layer. This char shell performs three barrier functions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oxygen barrier: cuts off oxygen supply for combustion<\/li>\n\n\n\n<li>Heat feedback barrier: reduces flame radiation to the substrate<\/li>\n\n\n\n<li>Volatile barrier: prevents diffusion of combustible small\u001emolecule gases from rubber decomposition to the flame zone<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Phosphorus\u001enitrogen flame retardants achieve fire retardancy through&nbsp;gas\u001ephase and condensed\u001ephase synergy, with low smoke and low toxicity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mechanism 2: Gas\u001ePhase Radical Trapping \u2013 Interrupting the Combustion Chain Reaction<br>During thermal decomposition, FR99RP releases phosphorus\u001econtaining active radicals that efficiently trap the&nbsp;H\u00b7 and OH\u00b7 radicals&nbsp;that sustain the chain reaction, forming stable molecular products and thereby&nbsp;interrupting the combustion chain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mechanism 3: Endothermic Cooling and Dilution Effect<br>The thermal decomposition of FR99RP is&nbsp;endothermic, absorbing substantial heat from the combustion zone and lowering the surface temperature of the substrate. Simultaneously, released&nbsp;water vapour and carbon dioxide&nbsp;dilute the combustible gas concentration in the flame zone, further suppressing combustion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Processing Advantages from Platelet Morphology and Surface Activation<br>FR99RP features a&nbsp;platelet\u001etype morphology&nbsp;and&nbsp;surface activation treatment, conferring outstanding processing characteristics:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excellent dispersion: uniformly distributed in the compound without agglomeration<\/li>\n\n\n\n<li>Superior flow: smooth compound flow, stable extrusion dimensions<\/li>\n\n\n\n<li>Low mixing energy: reduced energy consumption during mixing<\/li>\n\n\n\n<li>Shorter cure time: does not interfere with the curing system; indeed can shorten optimum cure time<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Limitations &amp; Trade\u001eoffs<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>FR99RP has a LOI of 35.4% in EPDM 70 Shore A, lower than FR98RP\u2019s 42.3% \u2013 if LOI is the sole priority, FR98RP may still be considered, but at the cost of comprehensive performance.<\/li>\n\n\n\n<li>May have a slight colour effect on light\u001ecoloured or coloured articles; colour matching evaluation is recommended for such systems.<\/li>\n\n\n\n<li>Optimum loading in different rubber bases (NR, SBR, CR, etc.) should be optimised per formulation.<\/li>\n\n\n\n<li>Not recommended for high\u001eloading combinations with alkaline fillers such as calcium carbonate, as they may affect flame retardancy.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Comparative Analysis<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Table 1: Comprehensive Comparison of FR99RP vs. FR98RP in EPDM 70 Shore A<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Based on standard formulation comparative test data:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Propiedad<\/td><td>FR98RP\u001e80<\/td><td>FR99RP\u001e80<\/td><td>FR98RP\u001e100<\/td><td>FR99RP\u001e100<\/td><td>Key Difference (at 100 phr)<\/td><\/tr><tr><td>Processing &amp; curing<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><\/tr><tr><td>ML \/ lbf\u00b7in<\/td><td>0.92<\/td><td>0.91<\/td><td>1.09<\/td><td>1.04<\/td><td>FR99RP slightly lower<\/td><\/tr><tr><td>MH \/ lbf\u00b7in<\/td><td>11.18<\/td><td>12.55<\/td><td>11.27<\/td><td>14.62<\/td><td>FR99RP \u219129.7%<\/td><\/tr><tr><td>MH\u001eML \/ lbf\u00b7in<\/td><td>10.26<\/td><td>11.65<\/td><td>10.18<\/td><td>13.58<\/td><td>FR99RP \u219133.4% (higher crosslink density)<\/td><\/tr><tr><td>TS2 \/ sec<\/td><td>59<\/td><td>41<\/td><td>63<\/td><td>41<\/td><td>FR99RP shorter scorch time<\/td><\/tr><tr><td>TC90 \/ sec<\/td><td>207<\/td><td>96<\/td><td>221<\/td><td>112<\/td><td>FR99RP cure time \u219349.3%<\/td><\/tr><tr><td>Propiedades mec\u00e1nicas<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><\/tr><tr><td>Hardness \/ Shore A<\/td><td>74<\/td><td>74<\/td><td>74<\/td><td>76<\/td><td>FR99RP slightly higher<\/td><\/tr><tr><td>Tensile strength \/ MPa<\/td><td>7.63<\/td><td>9.26<\/td><td>6.35<\/td><td>9.32<\/td><td>FR99RP \u219146.8%<\/td><\/tr><tr><td>Elongation at break \/ %<\/td><td>406<\/td><td>421<\/td><td>417<\/td><td>497<\/td><td>FR99RP \u219119.2%<\/td><\/tr><tr><td>M100 \/ MPa<\/td><td>2.64<\/td><td>2.77<\/td><td>2.59<\/td><td>2.69<\/td><td>Similar<\/td><\/tr><tr><td>Specific gravity \/ g\u00b7cm\u207b\u00b3<\/td><td>1.221<\/td><td>1.238<\/td><td>1.241<\/td><td>1.242<\/td><td>Similar<\/td><\/tr><tr><td>Retardancia a la llama<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><\/tr><tr><td>UL94 vertical burn<\/td><td>V0<\/td><td>V0<\/td><td>V0<\/td><td>V0<\/td><td>All pass<\/td><\/tr><tr><td>LOI \/ %<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>42.3<\/td><td>35.4<\/td><td>FR98RP higher<\/td><\/tr><tr><td>Burning behaviour<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>Vigorous expansion, heavy smoke<\/td><td>Ceramic\u001elike monolithic char<\/td><td>FR99RP cleaner<\/td><\/tr><tr><td>Hot\u001eair ageing (100\u00b0C\u00d770h)<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><\/tr><tr><td>Aged hardness \/ Shore A<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>83<\/td><td>79<\/td><td>FR99RP lower<\/td><\/tr><tr><td>Cambio de dureza<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>+5<\/td><td>+3<\/td><td>FR99RP better<\/td><\/tr><tr><td>Aged tensile strength \/ MPa<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>5.87<\/td><td>8.99<\/td><td>FR99RP \u219153.2%<\/td><\/tr><tr><td>Tensile strength change \/ %<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>7.56<\/td><td>3.54<\/td><td>FR99RP better<\/td><\/tr><tr><td>Aged elongation \/ %<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>275<\/td><td>406<\/td><td>FR99RP \u219147.6%<\/td><\/tr><tr><td>Elongation change \/ %<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>34.05<\/td><td>18.31<\/td><td>FR99RP better<\/td><\/tr><tr><td>Compression set &amp; resilience<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><td>&nbsp;<\/td><\/tr><tr><td>Compression set (120\u00b0C\u00d724h) \/ %<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>52.94<\/td><td>31.43<\/td><td>FR99RP \u219340.6%<\/td><\/tr><tr><td>Rebound resilience \/ %<\/td><td>&#8212;<\/td><td>&#8212;<\/td><td>37<\/td><td>47<\/td><td>FR99RP \u219127.0%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Data interpretation<strong>:<\/strong>&nbsp;FR98RP has an LOI advantage (42.3% vs. 35.4%), but this comes at the cost of 46.8% lower tensile strength, 49.3% longer cure time, 68.5% higher compression set, 21% lower resilience, and 47.6% lower elongation after heat ageing. For most engineering applications,&nbsp;UL94 V\u001e0 plus excellent overall performance balance is far more valuable than a higher LOI number.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Table 2: FR99RP vs. FR98RP in EPDM 50 Shore A<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Propiedad<\/td><td>FR98RP\u001e100<\/td><td>FR99RP\u001e100<\/td><td>Difference<\/td><\/tr><tr><td>Hardness \/ Shore A<\/td><td>67<\/td><td>67<\/td><td>Same<\/td><\/tr><tr><td>Tensile strength \/ MPa<\/td><td>8.03<\/td><td>9.31<\/td><td>FR99RP \u219115.9%<\/td><\/tr><tr><td>Elongation at break \/ %<\/td><td>550<\/td><td>553<\/td><td>Similar<\/td><\/tr><tr><td>M100 \/ MPa<\/td><td>1.75<\/td><td>1.85<\/td><td>FR99RP slightly higher<\/td><\/tr><tr><td>MH\u001eML \/ lbf\u00b7in<\/td><td>8.40<\/td><td>9.31<\/td><td>FR99RP \u219110.8%<\/td><\/tr><tr><td>TC90 \/ sec<\/td><td>199<\/td><td>131<\/td><td>FR99RP \u219334.2%<\/td><\/tr><tr><td>UL94 rating<\/td><td>V0<\/td><td>V0<\/td><td>Both pass<\/td><\/tr><tr><td>LOI \/ %<\/td><td>41.5<\/td><td>30.5<\/td><td>FR98RP higher<\/td><\/tr><tr><td>Resilience \/ %<\/td><td>44<\/td><td>51<\/td><td>FR99RP \u219115.9%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Table 3: FR99RP vs. FR98RP in NBR 70 Shore A<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Propiedad<\/td><td>FR98RP\u001e100<\/td><td>FR99RP\u001e100<\/td><td>Difference<\/td><\/tr><tr><td>Hardness \/ Shore A<\/td><td>75<\/td><td>76<\/td><td>Similar<\/td><\/tr><tr><td>Tensile strength \/ MPa<\/td><td>9.43<\/td><td>9.23<\/td><td>Similar<\/td><\/tr><tr><td>Elongation at break \/ %<\/td><td>522<\/td><td>455<\/td><td>FR98RP higher<\/td><\/tr><tr><td>M100 \/ MPa<\/td><td>2.55<\/td><td>2.94<\/td><td>FR99RP higher modulus<\/td><\/tr><tr><td>MH\u001eML \/ lbf\u00b7in<\/td><td>8.45<\/td><td>12.53<\/td><td>FR99RP \u219148.3%<\/td><\/tr><tr><td>TC90 \/ sec<\/td><td>79<\/td><td>94<\/td><td>FR98RP slightly faster<\/td><\/tr><tr><td>UL94 rating<\/td><td>V0<\/td><td>V0<\/td><td>Both pass<\/td><\/tr><tr><td>LOI \/ %<\/td><td>37.8<\/td><td>32.6<\/td><td>FR98RP higher<\/td><\/tr><tr><td>Resilience \/ %<\/td><td>24<\/td><td>33<\/td><td>FR99RP \u219137.5%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Data interpretation:&nbsp;In NBR, FR99RP maintains V\u001e0 while delivering&nbsp;significantly higher crosslink density (+48.3%) and resilience (+37.5%)&nbsp;\u2013 critical for oil seals, gaskets and other dynamic sealing applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Table 4: FR99RP vs. Conventional Flame Retardant Technology Routes<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Dimensi\u00f3n de comparaci\u00f3n<\/td><td>FR99RP<\/td><td>Metal Hydrates (ATH\/MH)<\/td><td>Traditional Phosphorus\u001eNitrogen<\/td><td>Halogenados<\/td><\/tr><tr><td>Loading to reach V\u001e0 \/ phr<\/td><td>60\u001e130<\/td><td>150\u001e200+<\/td><td>100\u001e150<\/td><td>30\u001e60<\/td><\/tr><tr><td>Tensile strength retention<\/td><td>High (9.32 MPa)<\/td><td>Bajo<\/td><td>Medio<\/td><td>Alta<\/td><\/tr><tr><td>Deformaci\u00f3n por compresi\u00f3n<\/td><td>Low (31.43%)<\/td><td>Alta<\/td><td>Alta<\/td><td>Bajo<\/td><\/tr><tr><td>Heat ageing performance<\/td><td>Excelente<\/td><td>Average<\/td><td>Pobre<\/td><td>Bien<\/td><\/tr><tr><td>Processing flow<\/td><td>Bien<\/td><td>Pobre<\/td><td>Average<\/td><td>Bien<\/td><\/tr><tr><td>Environmental compliance (REACH\/RoHS)<\/td><td>Conforme<\/td><td>Conforme<\/td><td>Depends on product<\/td><td>Partially restricted<\/td><\/tr><tr><td>Smoke during combustion<\/td><td>Low (ceramic char)<\/td><td>Medio<\/td><td>Alta<\/td><td>Alta<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Aplicaciones<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical Application Industries and Products for FR99RP<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>No.<\/td><td>Industria<\/td><td>Productos t\u00edpicos<\/td><td>Key Contribution<\/td><td>Relevant Standard<\/td><\/tr><tr><td>1<\/td><td>Railway<\/td><td>High\u001espeed train\/metro sealing strips, floor coverings, buffer pads<\/td><td>V\u001e0 flame retardancy + low smoke + excellent compression set<\/td><td>EN45545\u001e2 R22\/R23<\/td><\/tr><tr><td>2<\/td><td>New Energy Vehicles (EV)<\/td><td>Battery pack sealing gaskets, high\u001evoltage cable jackets, connector seals<\/td><td>V\u001e0 flame retardancy + heat resistance + insulation<\/td><td>UL94 V\u001e0<\/td><\/tr><tr><td>3<\/td><td>Wire &amp; Cable<\/td><td>EPDM\/NBR insulation layers, jackets<\/td><td>V\u001e0\/VW\u001e1 flame retardancy + flexibility<\/td><td>UL94 V\u001e0<\/td><\/tr><tr><td>4<\/td><td>Automoci\u00f3n<\/td><td>Oil\u001eresistant hoses, engine mounts, dust covers<\/td><td>Flame retardancy + oil resistance + heat ageing resistance<\/td><td>&#8212;<\/td><\/tr><tr><td>5<\/td><td>Petroleum &amp; Mining<\/td><td>Flame\u001eretardant conveyor belts, anti\u001estatic seals<\/td><td>V\u001e0 flame retardancy + anti\u001estatic<\/td><td>&#8212;<\/td><\/tr><tr><td>6<\/td><td>Building Seals<\/td><td>Fire\u001erated sealing strips, expansion joints<\/td><td>Flame retardancy + weatherability + compression recovery<\/td><td>&#8212;<\/td><\/tr><tr><td>7<\/td><td>Electr\u00f3nica<\/td><td>Electrical appliance sealing pads, plug jackets<\/td><td>V\u001e0 flame retardancy + dimensional stability<\/td><td>UL94 V\u001e0<\/td><\/tr><tr><td>8<\/td><td>Aeroespacial<\/td><td>Cabin seals, cable jackets<\/td><td>Low smoke + low toxicity + flame retardancy<\/td><td>&#8212;<\/td><\/tr><tr><td>9<\/td><td>Industrial Rubber Goods<\/td><td>Diaphragms, gaskets, vibration dampers<\/td><td>Flame retardancy + dynamic fatigue resistance<\/td><td>&#8212;<\/td><\/tr><tr><td>10<\/td><td>Bienes de consumo<\/td><td>Flame\u001eretardant rubber mats, tool grips<\/td><td>Halogen\u001efree, environmentally friendly + tactile feel<\/td><td>&#8212;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Case Studies<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Case Study 1: EPDM Railway Sealing Strip \u2013 Performance Leap from FR98RP to FR99RP<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Background:&nbsp;A railway components manufacturer producing EPDM sealing strips for high\u001espeed train carriages required simultaneous achievement of UL94 V\u001e0, performance retention after 100\u00b0C\u00d770h heat ageing, and compression set at 120\u00b0C\u00d724h \u226440%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Problem:&nbsp;The original flame retardant FR98RP (100 phr) achieved V\u001e0 and a high LOI (42.3%), but suffered from:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Long cure time (TC90=221 sec), low productivity<\/li>\n\n\n\n<li>Compression set of 52.94% (120\u00b0C\u00d724h), rapid loss of sealing function after high\u001etemperature service<\/li>\n\n\n\n<li>Elongation after ageing only 275% (change \u001e34.05%), obvious embrittlement<\/li>\n\n\n\n<li>Heavy smoke during combustion, failing increasingly stringent low\u001esmoke requirements<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Analysis:&nbsp;Root cause was FR98RP\u2019s interference with the EPDM vulcanisation network (MH\u001eML only 10.18 lbf\u00b7in) and catalytic effect on thermo\u001eoxidative ageing by its decomposition products.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Solution:&nbsp;Switched to FR99RP at the same loading (100 phr), with no other formulation changes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Result:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UL94 V\u001e0: maintained<\/li>\n\n\n\n<li>Tensile strength: from 6.35 MPa to\u00a09.32 MPa (+46.8%)<\/li>\n\n\n\n<li>Elongation at break: from 417% to\u00a0497% (+19.2%)<\/li>\n\n\n\n<li>Cure time (TC90): from 221 sec to\u00a0112 sec (\u001e49.3%)\u00a0\u2013 nearly doubled productivity<\/li>\n\n\n\n<li>Compression set (120\u00b0C\u00d724h): from 52.94% to\u00a031.43% (\u001e40.6%)<\/li>\n\n\n\n<li>Elongation after ageing: from 275% to\u00a0406% (+47.6%)<\/li>\n\n\n\n<li>Rebound resilience: from 37% to\u00a047% (+27%)<\/li>\n\n\n\n<li>Burning behaviour: from vigorous expansion + heavy smoke to\u00a0dense ceramic\u001elike monolithic char layer<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Lessons Learned:&nbsp;V\u001e0 flame retardancy and excellent long\u001eterm durability can be achieved together \u2013 the key is flame retardant selection, not just loading adjustment. FR99RP\u2019s comprehensive performance advantage makes it ideal for railway sealing applications. This exemplifies why we are recognised as a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>low smoke flame retardant rubber manufacturer<\/strong><\/u><\/strong><u>&nbsp;y un&nbsp;<\/u><strong><u><strong>halogen free flame retardant rubber manufacturer<\/strong><\/u><\/strong><\/a>&nbsp;that prioritises both safety and durability.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Case Study 2: NBR Automotive Oil\u001eResistant Seals \u2013 FR99RP Improves Resilience and Crosslink Density<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Background:&nbsp;An automotive parts supplier produced NBR oil\u001eresistant seals that needed to pass UL94 V\u001e0 and maintain sufficient resilience for long\u001eterm sealing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Problem:&nbsp;Using FR98RP (100 phr) to reach V\u001e0 resulted in low crosslink density (MH\u001eML=8.45 lbf\u00b7in) and resilience of only 24%, leading to leakage after extended service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Analysis:&nbsp;FR98RP significantly reduced crosslink density in NBR, compromising the elastic network and recovery capacity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Solution:&nbsp;Switched to FR99RP at the same loading.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Result:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UL94 V\u001e0: maintained<\/li>\n\n\n\n<li>Crosslink density (MH\u001eML): from 8.45 to\u00a012.53 lbf\u00b7in (+48.3%)<\/li>\n\n\n\n<li>Resilience: from 24% to\u00a033% (+37.5%)<\/li>\n\n\n\n<li>Tensile strength: 9.23 MPa (comparable to FR98RP\u2019s 9.43 MPa)<\/li>\n\n\n\n<li>M100 modulus: from 2.55 to\u00a02.94 MPa (+15.3%)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Lessons Learned:&nbsp;For dynamic sealing applications,&nbsp;resilience is as important as flame retardancy. FR99RP\u2019s \u201chigh crosslink density + high resilience\u201d makes it the superior choice for NBR flame\u001eretardant formulations. This confirms its role as an&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>Eco friendly flame retardant for NBR rubber<\/strong><\/u><\/strong><\/a>&nbsp;y un fiable<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><u>&nbsp;<\/u><strong><u><strong>halogen free flame retardant for NBR rubber seals<\/strong><\/u><\/strong><\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Failure Analysis: Typical Failure Modes of Flame\u001eRetardant Rubber Products and FR99RP Countermeasures<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failure Mode 1: Seal Failure under High\u001eTemperature Service<br>Phenomenon:&nbsp;After long\u001eterm service at 80\u001e120\u00b0C, compression set increases, sealing function lost.<br>Root Cause:&nbsp;Flame retardant destabilises the crosslink network; at high temperature, crosslinks break or rearrange, causing loss of elastic recovery. Although EPDM has excellent inherent heat resistance, improper flame retardant selection destroys this advantage.<br>FR99RP Countermeasure:&nbsp;Compression set at 120\u00b0C\u00d724h only 31.43%, far better than FR98RP\u2019s 52.94%; crosslink network thermally stable. In EPDM 70 Shore A, MH\u001eML reaches 13.58 lbf\u00b7in, indicating sufficient crosslink density.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failure Mode 2: Surface Cracking and Sharp Performance Drop after Thermo\u001eOxidative Ageing<br>Phenomenon:&nbsp;Crazing on the surface after heat ageing, with drastic loss of tensile strength and elongation.<br>Root Cause:&nbsp;Decomposition products catalyse oxidation, accelerating chain scission.<br>FR99RP Countermeasure:&nbsp;After ageing (100\u00b0C\u00d770h), tensile strength 8.99 MPa (retention 96.5%), elongation 406% (retention 81.7%) \u2013 far superior to FR98RP\u2019s 5.87 MPa and 275%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failure Mode 3: Heavy Smoke and Melt Dripping during Combustion<br>Phenomenon:&nbsp;Dense smoke and hot melt drips during burning, causing secondary hazards.<br>Root Cause:&nbsp;Some flame retardants cannot form a stable char layer; the char is loose and fragile, leading to melt dripping.<br>FR99RP Countermeasure:&nbsp;Forms a&nbsp;dense, intact ceramic\u001elike monolithic char layer&nbsp;\u2013 no dripping, low smoke. This is especially important in railway and aerospace applications with strict smoke restrictions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failure Mode 4: Low Curing Efficiency Caused by Flame Retardant<br>Phenomenon:&nbsp;Long cure cycles, high energy consumption, low productivity.<br>Root Cause:&nbsp;Acidity or reactivity of the flame retardant interferes with the curing system.<br>FR99RP Countermeasure:&nbsp;TC90 in EPDM 70 Shore A is only 112 seconds \u2013 compared with FR98RP\u2019s 221 seconds,&nbsp;cure cycle shortened by 49.3%, nearly doubling productivity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failure Mode 5: Blooming and Contamination of Contact Surfaces<br>Phenomenon:&nbsp;After long\u001eterm use, flame retardant migrates to the surface, contaminating contacted metals or electronic components.<br>Root Cause:&nbsp;Poor compatibility with the rubber matrix, low molecular weight.<br>FR99RP Countermeasure:&nbsp;Surface activation treatment ensures strong bonding with the rubber matrix, low migration tendency.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Selection Guide: FR99RP Applicability<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Scenarios suitable for FR99RP:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rubber bases:\u00a0EPDM, NBR, NR, SBR, CR, IIR, ACM\u00a0and other organic rubbers<\/li>\n\n\n\n<li>Need\u00a0UL94 V\u001e0 flame retardancy\u00a0with\u00a0good overall physical properties<\/li>\n\n\n\n<li>Require\u00a0high retention of properties after heat ageing\u00a0(long\u001eterm high\u001etemperature service)<\/li>\n\n\n\n<li>Need\u00a0low compression set\u00a0(seals, gaskets)<\/li>\n\n\n\n<li>Require\u00a0rebound resilience\u00a0(dynamic seals, vibration damping)<\/li>\n\n\n\n<li>Pursue\u00a0processing efficiency\u00a0(short cure cycles)<\/li>\n\n\n\n<li>Railway, EV, wire &amp; cable, automotive, industrial rubber goods<\/li>\n\n\n\n<li>Products must comply with\u00a0REACH, RoHS\u00a0environmental regulations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Scenarios better suited to other technologies:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LOI is the sole priority, and you are willing to accept 46.8% lower tensile strength, 49.3% longer cure time, 68.5% higher compression set, and 21% lower resilience \u2192 consider FR98RP<\/li>\n\n\n\n<li>Only mild flame retardancy improvement needed with no requirement for mechanical properties or durability \u2192 lower\u001ecost metal hydrates<\/li>\n\n\n\n<li>Extremely low loading and no environmental concern \u2192 halogenated flame retardants (but note regulatory risks)<\/li>\n\n\n\n<li>Extreme colour requirements (pure white\/transparent) \u2192 evaluate colour effect of FR99RP<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Lifecycle Analysis<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Performance Evolution of FR99RP in EPDM Seals<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Initial stage (0\u001e6 months):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excellent dispersion and low interference with the curing system ensure high initial performance consistency.<\/li>\n\n\n\n<li>Short cure cycles, high productivity, low energy consumption.<\/li>\n\n\n\n<li>Smooth surface, good dimensional accuracy.<\/li>\n\n\n\n<li>Flame retardancy stable at UL94 V\u001e0.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Mid\u001estage (6 months \u2013 3 years):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Heat ageing advantage becomes evident \u2013 hardness rise slow (only +3 points at 100\u00b0C\u00d770h), tensile strength and elongation well retained.<\/li>\n\n\n\n<li>Compression set remains low (31.43%), ensuring continuous sealing function.<\/li>\n\n\n\n<li>Rebound resilience remains high (47%), stable dynamic sealing performance.<\/li>\n\n\n\n<li>EPDM\u2019s inherent weatherability and ozone resistance are fully preserved.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Late stage (3+ years):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Service life significantly extended\u00a0compared with FR98RP formulations \u2013 the gap in aged tensile strength (8.99 vs. 5.87 MPa) and elongation (406 vs. 275%) translates into a longer replacement cycle.<\/li>\n\n\n\n<li>Ceramic\u001echar formation capability ensures flame retardancy throughout the lifecycle.<\/li>\n\n\n\n<li>Lower maintenance frequency, clear total\u001ecost\u001eof\u001eownership advantage.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Maintenance recommendations:<\/strong>&nbsp;FR99RP does not change normal usage and maintenance specifications, but the improved heat ageing resistance and low compression set allow extended inspection and replacement intervals for seals.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Total Cost of Ownership<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Although FR99RP may have a slightly higher raw\u001ematerial cost than some conventional flame retardants, from a TCO perspective:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Production cost reduction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cure cycle shortened by 49.3% (TC90 from 221 to 112 sec) \u2013 directly lowers energy and labour cost per unit.<\/li>\n\n\n\n<li>Lower Mooney viscosity reduces mixing energy.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Maintenance cost reduction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Compression set reduced by 40.6% (52.94%\u219231.43%) \u2013 lower seal replacement frequency.<\/li>\n\n\n\n<li>Better heat ageing performance \u2013 longer product service life.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Replacement cost reduction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Higher tensile strength (9.32 vs. 6.35 MPa) \u2013 higher mechanical robustness, lower breakage rate.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Safety cost reduction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ceramic\u001elike char, low\u001esmoke burning behaviour \u2013 lower secondary hazards in fire.<\/li>\n\n\n\n<li>Halogen\u001efree, REACH\/RoHS compliant \u2013 zero regulatory risk cost.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Standards &amp; Compliance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FR99RP meets or can be referenced against the following standards:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>REACH (EC 1907\/2006):\u00a0SVHC tested and passed<\/li>\n\n\n\n<li>RoHS 2.0 (2011\/65\/EU):\u00a0including 2015\/863 amendment<\/li>\n\n\n\n<li>UL94 V\u001e0:\u00a0achievable in EPDM, NBR and many other rubbers<\/li>\n\n\n\n<li>EN45545\u001e2:\u00a0with appropriate formulation, can meet R22, R23 HL2 or HL3 requirements<\/li>\n\n\n\n<li>DIN 5510\u001e2:\u00a0can meet S4, SR2, ST2 requirements<\/li>\n\n\n\n<li>Free from: PBB, PBDE, chlorine, fluorine, antimony trioxide<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Note: For specific certifications, please refer to the product Technical Data Sheet (TDS) and Safety Data Sheet (SDS).<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Preguntas frecuentes<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q1: What is the core difference between FR99RP and FR98RP?<\/strong><br><em>Short Answer:<\/em>&nbsp;FR99RP is a next\u001egeneration product that outperforms FR98RP in mechanical properties, processing efficiency, heat ageing resistance, compression set and resilience, but has a lower LOI.<br><em>Detailed Answer:<\/em>&nbsp;FR98RP has a higher LOI (42.3% vs. 35.4%), but at the cost of 46.8% lower tensile strength, 49.3% longer cure time, 68.5% higher compression set, 21% lower resilience, and 47.6% lower elongation after ageing. FR99RP sacrifices some LOI for a balanced overall performance, making it more suitable for the vast majority of engineering applications. This is why we are proud to be a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>halogen free flame retardant rubber manufacturer<\/strong><\/u><\/strong><\/a>&nbsp;that prioritises real\u001eworld performance over a single laboratory metric.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q2: Which rubbers is FR99RP suitable for?<\/strong><br><em>Short Answer:<\/em>&nbsp;EPDM, NBR, NR, SBR, CR, IIR, ACM, etc.<br><em>Detailed Answer:<\/em>&nbsp;FR99RP has been systematically validated in EPDM and NBR; formulation validation is recommended for other rubbers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q3: What is the recommended loading of FR99RP?<\/strong><br><em>Short Answer:<\/em>&nbsp;60\u001e130 phr.<br><em>Detailed Answer:<\/em>&nbsp;Depends on hardness, physical properties, flame retardancy rating and processing requirements. Generally, 6\u001e8 phr increases hardness by 1 Shore A, and 3\u001e5 phr increases LOI by 1 unit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q4: Does FR99RP contain halogens?<\/strong><br><em>Short Answer:<\/em>&nbsp;No.<br><em>Detailed Answer:<\/em>&nbsp;FR99RP contains no PBB, PBDE, chlorine, fluorine or antimony trioxide; it is a genuine halogen\u001efree flame retardant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q5: How does FR99RP affect cure speed?<\/strong><br><em>Short Answer:<\/em>&nbsp;Significantly shortens cure time in EPDM.<br><em>Detailed Answer:<\/em>&nbsp;In EPDM 70 Shore A, FR99RP\u001e100 gives TC90 of 112 sec vs. FR98RP\u001e100 at 221 sec \u2013 a 49.3% reduction.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q6: What is the compression set of FR99RP?<\/strong><br><em>Short Answer:<\/em>&nbsp;31.43% (120\u00b0C\u00d724h, EPDM 70 Shore A).<br><em>Detailed Answer:<\/em>&nbsp;FR99RP\u001e100 gives 31.43%, while FR98RP\u001e100 gives 52.94% \u2013 a 40.6% improvement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q7: How is the heat ageing performance of FR99RP?<\/strong><br><em>Short Answer:<\/em>&nbsp;Excellent.<br><em>Detailed Answer:<\/em>&nbsp;After 100\u00b0C\u00d770h ageing, hardness change only +3 points, tensile strength retention 96.5%, elongation retention 81.7%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q8: Is FR99RP UL\u001ecertified?<\/strong><br><em>Short Answer:<\/em>&nbsp;Mature EPDM formulations containing FR99RP have passed UL certification.<br><em>Detailed Answer:<\/em>&nbsp;GreenThinking\u00ae FR99RP\u001ebased EPDM formulations developed by Sanzen Group have obtained UL certification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q9: How is the processing performance of FR99RP?<\/strong><br><em>Short Answer:<\/em>&nbsp;Excellent.<br><em>Detailed Answer:<\/em>&nbsp;Platelet morphology + surface activation provide good dispersion, good flow, stable dimensions, easy extrusion, and low mixing energy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q10: How does FR99RP compare with FR98RP in NBR?<\/strong><br><em>Short Answer:<\/em>&nbsp;FR99RP gives significantly higher crosslink density and resilience.<br><em>Detailed Answer:<\/em>&nbsp;In NBR, MH\u001eML is 12.53 vs. 8.45 lbf\u00b7in (+48.3%), resilience 33% vs. 24% (+37.5%).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q11: What is the storage stability of FR99RP?<\/strong><strong><br><\/strong><em>Short Answer:<\/em>&nbsp;2\u001eyear shelf life.<br><em>Detailed Answer:<\/em>&nbsp;Store in a dry, cool, sealed environment (approx. 25\u00b0C); shelf life about 2 years.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q12: How does FR99RP affect compound hardness?<\/strong><br><em>Short Answer:<\/em>&nbsp;Approximately 6\u001e8 phr increases hardness by 1 Shore A.<br><em>Detailed Answer:<\/em>&nbsp;Depends on the base formulation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q13: What are the combustion characteristics of FR99RP?<\/strong><br><em>Short Answer:<\/em>&nbsp;Forms a ceramic\u001elike monolithic char layer, low smoke.<br><em>Detailed Answer:<\/em>&nbsp;Unlike FR98RP\u2019s vigorous expansion and heavy smoke, FR99RP produces a dense, intact ceramic char.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q14: Is FR99RP suitable for railway applications?<\/strong><br><em>Short Answer:<\/em>&nbsp;Yes, especially.<br><em>Detailed Answer:<\/em>&nbsp;FR99RP achieves UL94 V\u001e0 in EPDM with excellent overall performance; with proper formulation it can meet EN45545\u001e2 R22, R23 HL2 or HL3. This makes it an ideal&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>low smoke flame retardant EPDM for railway seals<\/strong><\/u><\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q15: Is FR99RP suitable for light\u001ecoloured\/coloured articles?<\/strong><br><em>Short Answer:<\/em>&nbsp;Evaluation recommended.<br><em>Detailed Answer:<\/em>&nbsp;FR99RP is a white powder; it may have a slight colour effect on light\u001ecoloured systems; colour matching tests are advised.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q16: What is the difference between FR99RP and metal hydrate flame retardants?<\/strong><strong><br><\/strong><em>Short Answer:<\/em>&nbsp;Higher efficiency, lower loading, less impact on mechanical properties.<br><em>Detailed Answer:<\/em>&nbsp;Metal hydrates (ATH\/MH) typically require 150\u001e200 phr to reach V\u001e0, whereas FR99RP needs only 60\u001e130 phr.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q17: Is FR99RP suitable for CR (chloroprene rubber)?<\/strong><strong><br><\/strong><em>Short Answer:<\/em>&nbsp;Yes.<br><em>Detailed Answer:<\/em>&nbsp;FR99RP can be used in CR and other polar rubbers; small\u001escale compound trials are recommended.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q18: What is the rebound resilience of FR99RP?<\/strong><strong><br><\/strong><em>Short Answer:<\/em>&nbsp;Excellent (47% in EPDM 70 Shore A).<br><em>Detailed Answer:<\/em>&nbsp;FR99RP\u001e100 gives 47% resilience vs. 37% for FR98RP \u2013 a 27% improvement, significant for dynamic sealing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q19: Does FR99RP meet REACH and RoHS requirements?<\/strong><strong><br><\/strong><em>Short Answer:<\/em>&nbsp;Yes.<br><em>Detailed Answer:<\/em>&nbsp;FR99RP has passed independent third\u001eparty testing for REACH SVHC and RoHS 2.0 (including 2015\/863 amendment).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q20: How can I obtain FR99RP samples and technical support?<\/strong><strong><br><\/strong><em>Short Answer:<\/em>&nbsp;Contact Sanzen Group.<br><em>Detailed Answer:<\/em>&nbsp;Technical data sheets, samples and formulation optimisation support are available through the Sanzen Group official website or regional sales representatives.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Why Work With SaneZenChem?<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"765\" data-src=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2-1024x765.png.webp\" alt=\"Factory and company structure picture \" class=\"wp-image-4619 lazyload\" data-srcset=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2-1024x765.png.webp 1024w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2-300x224.png.webp 300w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2-768x574.png.webp 768w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2-1536x1147.png.webp 1536w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2-2048x1530.png.webp 2048w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2-16x12.png.webp 16w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2-500x373.png.webp 500w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2-600x448.png.webp 600w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/765;\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"695\" data-src=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2-1024x695.png.webp\" alt=\"Factory and company structure picture\" class=\"wp-image-4620 lazyload\" data-srcset=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2-1024x695.png.webp 1024w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2-300x204.png.webp 300w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2-768x522.png.webp 768w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2-1536x1043.png.webp 1536w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2-2048x1391.png.webp 2048w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2-18x12.png.webp 18w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2-500x340.png.webp 500w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2-600x407.png.webp 600w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/695;\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">What Makes SaneZen Different from Other Flame Retardant Suppliers?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Choosing a functional filler supplier is not merely about purchasing a mineral powder.&nbsp;It means selecting a technology partner that understands polymer compounding, physical failure mechanisms, and long\u001eterm product performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SaneZen (SaneZenChem) is precisely such a partner \u2013 we are not only a high\u001eperformance&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>f\u00e1brica de retardantes de llama libres de hal\u00f3genos<\/strong><\/u><\/strong><\/a>, but also a specialty chemical supplier with practical compounding experience in rubber and silicone rubber production. We are a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>rubber flame retardant additive manufacture<\/strong><\/u><\/strong><\/a>&nbsp;that produces and validates its own products, a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>UL94 V0 halogen free flame retardant supplier<\/strong><\/u><\/strong><\/a>&nbsp;with proven V\u001e0 formulations, and a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>low smoke flame retardant manufacturer<\/strong><\/u><\/strong><\/a>&nbsp;dedicated to real\u001efire safety.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">8.1 Dual Identity: We Are Both a Compounder and a Flame Retardant Manufacturer<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SaneZen operates five major manufacturing divisions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rubber compounds<\/li>\n\n\n\n<li>Silicone rubber compounds<\/li>\n\n\n\n<li>Specialty functional fillers<\/li>\n\n\n\n<li>High\u001eefficiency environmentally friendly flame retardants<\/li>\n\n\n\n<li>Polymer performance additives<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">What Does This Dual Identity Mean for You?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because SaneZen itself continuously produces and develops rubber and silicone rubber products, our flame retardant products \u2013 including the GreenThinking\u00ae FR series \u2013&nbsp;originate from solving real production issues, rather than remaining merely at the laboratory concept stage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This&nbsp;application\u001edriven R&amp;D approach&nbsp;enables us to develop practical solutions that deliver measurable improvements in customer products \u2013 from eliminating viscosity spikes during processing and preventing micro\u001ecrack formation, to ensuring high dielectric strength in demanding electrical environments.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">8.3 FR Series &nbsp;\u2013 Born from Production Practice<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The development of FR series was no accident. During SaneZen&#8217;s own rubber compounding production, the R&amp;D team had long faced a core challenge:&nbsp;how to enable EPDM, NBR, and other rubber products to consistently achieve a UL94 V0 flame retardant rating without sacrificing processing efficiency and mechanical properties?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Conventional halogen\u001efree flame retardant solutions typically meant:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Substantially higher mixing energy consumption<\/li>\n\n\n\n<li>Significantly prolonged curing times<\/li>\n\n\n\n<li>Drastic reductions in tensile strength and rebound resilience<\/li>\n\n\n\n<li>Rough product surfaces and unstable dimensions<\/li>\n\n\n\n<li>High batch\u001eto\u001ebatch performance variability<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">It was precisely these real, frontline, persistent production pain points that drove the R&amp;D direction of FR series &nbsp;\u2013 not pursuing excellence in a single metric (such as LOI value), but rather pursuing&nbsp;optimal balance of overall performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P\u00f3ngase en contacto con<\/strong><strong><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Direcci\u00f3n de la planta:<br>Camino Baishou, Distrito Norte de la Zona de Desarrollo Econ\u00f3mico de Xuan Zhou<br>Xuan Cheng City, Anhui Province, China<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Direcci\u00f3n Comercial:<br>Room 503, Building 1, Huixin International Edifice, No. 150 Puhuitang Road, Xuhui District, Shanghai, China 200030<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tel: +86 21 6487 9251<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Correo electr\u00f3nico: yorichen@sanezen.com \/ kevenwang@sanezen.com<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">P\u00e1gina web:&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/\"><u>www.sanezenrubber.com<\/u><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Halogen\u001eFree Flame Retardant FR99RP: Achieving UL94 V\u001e0 and Mechanical Performance Balance in EPDM and NBR This paper systematically presents the application mechanisms and performance data of GreenThinking\u00ae FR99RP, a halogen\u001efree phosphorus\u001enitrogen intumescent flame retardant, in EPDM, NBR and other rubbers. Through a triple\u001esynergy mechanism of \u201ccondensed\u001ephase charring + gas\u001ephase radical trapping + endothermic cooling\u201d, FR99RP [&hellip;]<\/p>","protected":false},"author":2,"featured_media":4618,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-4616","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-communication"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/posts\/4616","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/comments?post=4616"}],"version-history":[{"count":1,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/posts\/4616\/revisions"}],"predecessor-version":[{"id":4621,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/posts\/4616\/revisions\/4621"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/media\/4618"}],"wp:attachment":[{"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/media?parent=4616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/categories?post=4616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/tags?post=4616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}