{"id":4596,"date":"2026-09-07T16:17:00","date_gmt":"2026-09-07T08:17:00","guid":{"rendered":"https:\/\/sanezenrubber.com\/?p=4596"},"modified":"2026-09-07T16:17:00","modified_gmt":"2026-09-07T08:17:00","slug":"halogen-free-flame-retardant-fr99rp-fr76rp-a-technical-deep-dive-from-mechanism-to-application","status":"publish","type":"post","link":"https:\/\/sanezenrubber.com\/es\/technical-communication\/halogen-free-flame-retardant-fr99rp-fr76rp-a-technical-deep-dive-from-mechanism-to-application\/4596\/","title":{"rendered":"Halogen Free Flame Retardant: FR99RP &amp; FR76RP \u2013 A Technical Deep Dive from Mechanism to Application"},"content":{"rendered":"<p class=\"wp-block-paragraph\">This article systematically presents the technical mechanisms, performance comparisons, and engineering selection guides for GreenThinking\u00ae FR series&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>halogen free flame retardant<\/strong><\/u><\/strong><\/a>&nbsp;products \u2013 FR99RP and FR76RP. FR99RP is developed for EPDM, NBR and other rubber compounds, achieving UL94 V\u001e0 rating while maintaining excellent tensile strength, heat aging resistance, low compression set and high resilience. FR76RP is specially designed for silicone sealants, featuring ultra\u001efine particle size, outstanding dispersion and anti\u001edrip properties, and can be used at up to 50% by volume in silicone compounds. Both products are REACH, RoHS and WEEE compliant, representing the technological evolution of&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>halogen free flame retardant<\/strong><\/u><\/strong><\/a>&nbsp;from \u201csacrificing performance for safety\u201d to \u201cachieving both safety and performance\u201d. This article serves as a technical reference for formulation engineers and material selectors in the rubber and sealant industries.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\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&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>halogen free flame retardant<\/strong><\/u><\/strong><\/a>&nbsp;composite that works through a triple synergistic mechanism \u2013 forming a dense ceramic char layer upon heating, radical trapping, and endothermic cooling \u2013 to achieve V\u001e0 flammability rating in various rubbers such as EPDM and NBR without compromising mechanical properties and durability. FR76RP is an ultra\u001efine&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>silicone sealant flame retardant<\/strong><\/u><\/strong><\/a>&nbsp;specifically engineered for silicone sealants, delivering a balanced combination of high flame retardancy, excellent dispersion and anti\u001edrip performance in silicone systems.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Why It Happens: The Technical Paradigm Shift from \u201cCompliance\u201d to \u201cPerformance\u201d in the Flame Retardant Industry<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The global flame retardant market is undergoing a profound supply\u001eside transformation. Traditional halogenated flame retardants (such as polybrominated biphenyls, polybrominated diphenyl ethers, decabromodiphenyl ethane, etc.) are highly efficient, but their combustion products contain persistent organic pollutants like dioxins and furans, which have been progressively restricted or banned by regulations such as RoHS, REACH and WEEE worldwide.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, the transition to halogen\u001efree solutions has not been smooth. The industry has long faced a technical dilemma: the&nbsp;trade\u001eoff between flame retardancy and physical properties. Many&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>halogen free flame retardant<\/strong><\/u><\/strong><\/a>&nbsp;products require high loadings (over 100 phr) to achieve UL94 V\u001e0, at the cost of reduced tensile strength, lower elongation, worsened compression set, and poor processability. For rubber products such as seals, anti\u001evibration parts and cable sheaths that demand strict mechanical properties and durability, this \u201cperformance for safety\u201d compromise is often unacceptable to engineers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At the same time, application requirements for flame retardancy continue to escalate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Railway transportation: standards like EN 45545 and DIN 5510 require materials to simultaneously meet flame retardancy, low smoke, and low toxicity (FLST) \u2013 hence the need for a<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><u>\u00a0<\/u><strong><u><strong>low smoke flame retardant manufacturer<\/strong><\/u><\/strong><\/a>\u00a0capable of delivering all three.<\/li>\n\n\n\n<li>New energy vehicles: rubber parts inside battery packs must withstand thermal runaway conditions, requiring flame retardancy, high temperature resistance and insulation together \u2013 creating demand for a reliable\u00a0flame retardant for EV battery rubber insulation parts.<\/li>\n\n\n\n<li>Building sealants: China\u2019s GB\/T 24267\u001e2009 \u201cFlame retardant sealants for building\u201d sets clear technical requirements.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Against this background, the industry no longer needs just a \u201cfiller that can retard flames\u201d, but a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>functional additive that retards flames without sacrificing performance<\/strong><\/u><\/strong><\/a>. The GreenThinking\u00ae FR series (FR99RP and FR76RP) was developed precisely during this paradigm shift, and is offered by a leading&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>fabricante de retardantes de llama libres de hal\u00f3genos<\/strong><\/u><\/strong><\/a>&nbsp;that understands these real\u001eworld engineering needs.<\/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\"><a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>Misconception 1: Halogen\u001efree flame retardants are the same as metal hydrates like aluminium hydroxide or magnesium hydroxide<\/strong><\/u><\/strong><\/a><strong>.<\/strong><br>Aluminium hydroxide (ATH) and magnesium hydroxide (MDH) are common&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>halogen free flame retardant<\/strong><\/u><\/strong><\/a>&nbsp;types, working by endothermic decomposition and water vapour release. However, their efficiency is low; typically 150\u001e200 phr is required to reach V\u001e0, causing severe property loss. FR99RP and FR76RP belong to the phosphorus\u001enitrogen intumescent system, with much higher efficiency \u2013 recommended dosages are only 60\u001e130 phr, making them a true&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>rubber fire retardant additive supplier<\/strong><\/u><\/strong><\/a>\u2019s choice for high\u001eperformance compounds.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>Misconception 2: The more flame retardant added, the better the flame retardancy.<\/strong><\/u><\/strong><\/a><br>Flame retardancy has a \u201ccritical concentration\u201d effect. Overloading not only deteriorates mechanical properties but may also reduce uniformity due to agglomeration. A better strategy is to use synergistic ratios and particle size design to achieve V\u001e0 at lower loadings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>Misconception 3: The finer the flame retardant, the better<\/strong><\/u><\/strong><\/a><strong>.<\/strong><br>Excessively fine particles cause dusting losses, difficult mixing, and increased Mooney viscosity. FR99RP and FR76RP adopt a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>rational particle size distribution<\/strong><\/u><\/strong><\/a>&nbsp;(D50 1\u001e2 \u03bcm) to balance dispersion and processability \u2013 a hallmark of an experienced&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>EPDM flame retardant manufacturer<\/strong><\/u><\/strong><\/a>&nbsp;and silicone specialist.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>Misconception 4: All halogen\u001efree flame retardants are automatically compliant with environmental regulations<\/strong><\/u><\/strong><\/a><strong>.<\/strong><br>\u201cHalogen\u001efree\u201d and \u201ccompliant\u201d are two different concepts. Some halogen\u001efree products may still contain REACH Substances of Very High Concern (SVHC). The FR series has passed independent third\u001eparty testing and complies with REACH SVHC and RoHS 2.0 (including 2015\/863 amendment), making us a trusted&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>REACH compliant flame retardant supplier<\/strong><\/u><\/strong><u>.<\/u><u><\/u><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><u><strong>Misconception 5: Flame retardants only affect flammability, not product service life<\/strong><\/u><\/strong><strong>.<\/strong><br>The type of flame retardant directly impacts long\u001eterm reliability. Earlier products like FR98RP could achieve V\u001e0, but their high\u001etemperature compression set reached 52.94% \u2013 meaning seals would quickly lose their sealing function under high temperatures. FR99RP achieves the same V\u001e0 rating with a compression set of only 31.43%, significantly extending service life. This is exactly what a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>rubber flame retardant with low heat aging degradation<\/strong><\/u><\/strong><\/a>&nbsp;should deliver.<\/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: Three Origins 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>Most inorganic or organic flame retardants have limited compatibility with rubber, forming a \u201csea\u001eisland\u201d dispersion. Without chemical bonding at the interface, they become stress concentration points under dynamic loading, initiating micro\u001ecracks. FR99RP uses&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>surface activation technology<\/strong><\/u><\/strong><\/a>&nbsp;to improve interfacial bonding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Root Cause 2: Interference of flame retardant with the vulcanisation network<br>The acidic\/basic nature or reactivity of some flame retardants can disturb the vulcanisation reaction, manifesting as shortened scorch time (TS2) or extended cure time (TC90). FR99RP shows better compatibility with curing systems than FR98RP \u2013 in a 70 Shore A EPDM formulation, TC90 is 112 s, significantly shorter than FR98RP\u2019s 221 s, meaning higher production efficiency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Root Cause 3: Decomposition products accelerate thermo\u001eoxidative aging<br>By\u001eproducts released during vulcanisation or long\u001eterm service can catalyse thermo\u001eoxidative aging, resulting in rising hardness, falling tensile strength, and rapid deterioration of compression set. FR99RP\u2019s hot air aging data (100\u2103\u00d770h) show a tensile strength change of only \u001e3.54% and elongation change of \u001e18.31%, far superior to FR98RP \u2013 clearly demonstrating it as a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>rubber chemical to achieve V0 flammability without property loss<\/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\">Technical Mechanism: Triple Synergistic Flame Retardancy of FR99RP and FR76RP<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The core technical logic of the FR series is not a single mechanism, but a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>triple synergistic physico\u001echemical process<\/strong><\/u><\/strong><\/a>&nbsp;involving condensed phase, gas phase, and thermodynamic effects.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mechanism 1: Dense char layer formation \u2013 condensed phase barrier<br>When heated or exposed to flame, the FR series rapidly decomposes and expands on the rubber or silicone surface, forming a&nbsp;dense, viscous ceramic crust insulation layer. This char layer provides three barrier functions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oxygen isolation: cuts off oxygen supply for combustion.<\/li>\n\n\n\n<li>Heat feedback blocking: reduces radiant heat from the flame to the substrate, suppressing internal temperature rise.<\/li>\n\n\n\n<li>Volatile barrier: prevents combustible small molecules from diffusing to the flame zone.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">FR76RP forms a&nbsp;viscous crust&nbsp;in silicone sealants with a unique&nbsp;anti\u001edrip&nbsp;function \u2013 no molten drops are produced during combustion, preventing flame spread. This makes it an ideal&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>non halogen fire retardant for silicone sealant applications<\/strong><\/u><\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mechanism 2: Radical trapping \u2013 gas phase chain termination<br>Upon thermal decomposition, FR series release phosphorus\u001econtaining active radicals that efficiently capture&nbsp;H\u00b7 and OH\u00b7&nbsp;radicals sustaining the combustion chain reaction, forming stable molecular products and&nbsp;interrupting the chain reaction&nbsp;\u2013 a gas\u001ephase flame retardancy effect.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mechanism 3: Endothermic cooling and dilution<br>The thermal decomposition of the FR series is&nbsp;endothermic, absorbing large amounts of heat from the combustion zone and lowering the substrate surface temperature. At the same time, released inert gases like water vapour and CO\u2082 dilute the combustible gas concentration in the flame zone, further inhibiting combustion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Differentiated mechanism of FR76RP in silicone sealants<br>Silicone sealants are based on polydimethylsiloxane (PDMS), whose combustion behaviour differs from organic rubbers \u2013 silicone itself contains a Si\u001eO backbone and forms a silica skeleton upon burning. FR76RP leverages this by embedding a viscous crust into the silica skeleton, forming a&nbsp;\u201cinorganic skeleton + viscous char\u201d composite barrier, achieving higher efficiency than ordinary flame retardants in organic rubbers. Meanwhile, its ultra\u001efine particle size (D50 1\u001e2 \u03bcm) and surface treatment ensure a \u201cglossy, bubble\u001efree\u201d dispersion in 107 base polymers \u2013 a key requirement for any&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>silicone sealant flame retardant<\/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\">Comparative Analysis<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Table 1: Performance comparison between FR99RP and FR98RP in EPDM 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>Observaciones<\/td><\/tr><tr><td>Hardness \/ Shore A<\/td><td>74<\/td><td>76<\/td><td>Slightly higher for FR99RP<\/td><\/tr><tr><td>Tensile strength \/ MPa<\/td><td>6.35<\/td><td>9.32<\/td><td>\u219146.8%<\/td><\/tr><tr><td>Elongation at break \/ %<\/td><td>417<\/td><td>497<\/td><td>\u219119.2%<\/td><\/tr><tr><td>M100 \/ MPa<\/td><td>2.59<\/td><td>2.69<\/td><td>Similar<\/td><\/tr><tr><td>TC90 (cure time) \/ sec<\/td><td>221<\/td><td>112<\/td><td>\u219349.3% (higher productivity)<\/td><\/tr><tr><td>MH\u001eML (crosslink density) \/ lbf\u00b7in<\/td><td>10.18<\/td><td>13.58<\/td><td>\u219133.4%<\/td><\/tr><tr><td>UL94 rating<\/td><td>V0<\/td><td>V0<\/td><td>Both pass<\/td><\/tr><tr><td>LOI \/ %<\/td><td>42.3<\/td><td>35.4<\/td><td>FR98RP higher<\/td><\/tr><tr><td>Hardness change after aging<\/td><td>+5<\/td><td>+3<\/td><td>FR99RP better<\/td><\/tr><tr><td>Tensile change after aging \/ %<\/td><td>7.56<\/td><td>3.54<\/td><td>FR99RP better<\/td><\/tr><tr><td>Elongation change after aging \/ %<\/td><td>34.05<\/td><td>18.31<\/td><td>FR99RP better<\/td><\/tr><tr><td>Compression set (120\u2103\u00d724h) \/ %<\/td><td>52.94<\/td><td>31.43<\/td><td>FR99RP much better<\/td><\/tr><tr><td>Rebound resilience \/ %<\/td><td>37<\/td><td>47<\/td><td>FR99RP better<\/td><\/tr><tr><td>Burning behaviour<\/td><td>Strong swelling, heavy smoke<\/td><td>Forms ceramic char<\/td><td>FR99RP cleaner<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Interpretation: FR98RP has an advantage in LOI (42.3% vs 35.4%), but this comes at the cost of lower tensile strength, longer cure time, worse compression set and lower resilience. FR99RP sacrifices some LOI to achieve&nbsp;comprehensive superiority in all mechanical, processing and long\u001eterm durability indicators. For most engineering applications, V\u001e0 plus excellent property balance is more valuable than a higher LOI number. If LOI is the sole priority, FR98RP may still be considered, but with full acceptance of its performance trade\u001eoffs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Table 2: Performance comparison between FR99RP and 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>Observaciones<\/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>Close<\/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 (crosslink density) \/ lbf\u00b7in<\/td><td>8.45<\/td><td>12.53<\/td><td>\u219148.3%<\/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>Rebound resilience \/ %<\/td><td>24<\/td><td>33<\/td><td>\u219137.5%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Interpretation: In NBR systems, FR99RP also maintains V\u001e0 while providing higher crosslink density and resilience \u2013 critical for oil seals, gaskets and other dynamic sealing applications, making it a preferred&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>flame retardant for NBR oil resistant rubber products<\/strong><\/u><\/strong><\/a>&nbsp;y&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>UL94 V0 flame retardant for NBR hydraulic hose compounds<\/strong><\/u><\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Table 3: Applicability comparison of FR76RP with general flame retardants in silicone sealants<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Comparison dimension<\/td><td>FR76RP<\/td><td>Aluminium hydroxide (ATH)<\/td><td>Halogenated flame retardant<\/td><\/tr><tr><td>Efficiency (loading for V\u001e0)<\/td><td>~50% by volume<\/td><td>High loading<\/td><td>Low loading<\/td><\/tr><tr><td>Dispersi\u00f3n<\/td><td>Excellent (surface\u001etreated)<\/td><td>Regular<\/td><td>Regular<\/td><\/tr><tr><td>Silicone appearance<\/td><td>Glossy, bubble\u001efree<\/td><td>May be rough<\/td><td>May discolour<\/td><\/tr><tr><td>Anti\u001edrip<\/td><td>Yes (viscous crust)<\/td><td>No<\/td><td>Some<\/td><\/tr><tr><td>Halogen content<\/td><td>Halogen\u001efree<\/td><td>Halogen\u001efree<\/td><td>Contains halogen<\/td><\/tr><tr><td>REACH\/RoHS compliant<\/td><td>Yes<\/td><td>Yes<\/td><td>Partly non\u001ecompliant<\/td><\/tr><tr><td>Effect on mechanicals<\/td><td>Slight<\/td><td>Significant reduction<\/td><td>Slight<\/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\">FR99RP typical applications<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>No.<\/td><td>Industria<\/td><td>Typical products<\/td><td>Key contribution<\/td><\/tr><tr><td>1<\/td><td>Railway transportation<\/td><td>High\u001espeed train sealing strips, floor mats, buffer pads<\/td><td>V\u001e0 + low smoke + low toxicity, compliant with DIN 5510\/EN 45545 \u2013 ideal as a&nbsp;<strong><a href=\"https:\/\/sanezenrubber.com\/es\/product\/\">halogen free flame retardant for railway sealing strips<\/a><\/strong><\/td><\/tr><tr><td>2<\/td><td>New energy vehicles<\/td><td>Battery insulation gaskets, high\u001evoltage cable sheaths, connector seals<\/td><td>V\u001e0 + heat resistance + insulation \u2013 a proven&nbsp;<strong><a href=\"https:\/\/sanezenrubber.com\/es\/product\/\">flame retardant for EV battery rubber insulation parts<\/a><\/strong><\/td><\/tr><tr><td>3<\/td><td>Wire &amp; cable<\/td><td>EPDM\/NBR insulation layers, jacketing<\/td><td>V\u001e0\/VW\u001e1 + flexibility<\/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 aging resistance<\/td><\/tr><tr><td>5<\/td><td>Mining &amp; petroleum<\/td><td>Fire\u001eresistant conveyor belts, anti\u001estatic seals<\/td><td>V\u001e0 + anti\u001estatic<\/td><\/tr><tr><td>6<\/td><td>Building seals<\/td><td>Fire\u001eretardant sealing strips, expansion joints<\/td><td>Flame retardancy + weather resistance + compression recovery<\/td><\/tr><tr><td>7<\/td><td>Electr\u00f3nica<\/td><td>Appliance gaskets, plug sheaths<\/td><td>V\u001e0 + dimensional stability<\/td><\/tr><tr><td>8<\/td><td>Aeroespacial<\/td><td>Cabin seals, cable sheaths<\/td><td>Low smoke, low toxicity + flame retardancy<\/td><\/tr><tr><td>9<\/td><td>Art\u00edculos de caucho industrial<\/td><td>Diaphragms, linings, vibration dampers<\/td><td>Flame retardancy + dynamic fatigue resistance<\/td><\/tr><tr><td>10<\/td><td>Consumer goods<\/td><td>Flame\u001eretardant rubber mats, tool grips<\/td><td>Halogen\u001efree, environmentally friendly, good touch<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">FR76RP typical applications<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>No.<\/td><td>Aplicaci\u00f3n<\/td><td>Typical products<\/td><td>Key requirements<\/td><\/tr><tr><td>1<\/td><td>Building sealants<\/td><td>Flame\u001eretardant sealants per GB\/T 24267\u001e2009<\/td><td>V\u001e0 + adhesion strength \u2013 a dedicated&nbsp;<strong><a href=\"https:\/\/sanezenrubber.com\/es\/product\/\">silicone sealant flame retardant<\/a><\/strong><\/td><\/tr><tr><td>2<\/td><td>Electr\u00f3nica<\/td><td>Potting compounds, thermally conductive flame\u001eretardant adhesives<\/td><td>Halogen\u001efree + dimensional stability<\/td><\/tr><tr><td>3<\/td><td>New energy vehicles<\/td><td>Battery pack sealants, thermally conductive structural adhesives<\/td><td>V\u001e0 + thermal conductivity + adhesion<\/td><\/tr><tr><td>4<\/td><td>Transportation<\/td><td>Vehicle body sealants, window bonding adhesives<\/td><td>Flame retardancy + weather resistance + adhesion<\/td><\/tr><tr><td>5<\/td><td>Solar\/wind power<\/td><td>Junction box potting, module sealing<\/td><td>Weather resistance + flame retardancy + insulation<\/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 1: EPDM railway sealing strips \u2013 FR99RP performance validation<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Background:<\/em>&nbsp;A European railway component manufacturer needed sealing strips for a new high\u001espeed train, requiring UL94 V\u001e0, hardness change \u22645 points after 100\u2103\u00d770h aging, and compression set \u226440% at 120\u2103\u00d724h.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Problem:<\/em>&nbsp;The previous&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>halogen free flame retardant<\/strong><\/u><\/strong><\/a>&nbsp;(competitor product) caused: tensile strength drop from 9.5 MPa to 6.2 MPa (\u001e35%); hardness rise of 8 points after aging (fail); compression set &gt;50% (120\u2103\u00d724h), leading to rapid seal failure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>An\u00e1lisis:<\/em>&nbsp;Root causes were weak interfacial bonding, interference with vulcanisation, and catalytic thermo\u001eoxidative aging by decomposition products.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Soluci\u00f3n:<\/em>&nbsp;Switched to FR99RP at 100 phr, other components unchanged.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Result:<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tensile strength: 9.32 MPa (retention >98%)<\/li>\n\n\n\n<li>Hardness change after aging: +3 points (pass)<\/li>\n\n\n\n<li>Compression set (120\u2103\u00d724h): 31.43% (better than 40%)<\/li>\n\n\n\n<li>UL94 V\u001e0: passed<\/li>\n\n\n\n<li>LOI: 35.4%<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Lessons learned:<\/em>&nbsp;V\u001e0 and excellent long\u001eterm durability can be achieved together \u2013 the key is selecting the right product, not just adjusting dosage. This confirms FR99RP as an outstanding&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>halogen free flame retardant for EPDM rubber compounds<\/strong><\/u><\/strong><\/a>&nbsp;y un fiable&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>flame retardant for rubber seals meets UL94 V0 level<\/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\">Case 2: NBR automotive oil hoses \u2013 FR99RP improves resilience<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Background:<\/em>&nbsp;An automotive parts supplier produced NBR oil\u001eresistant hoses that needed UL94 V\u001e0, and required sufficient resilience to ensure lasting sealing at hose joints.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Problem:<\/em>&nbsp;Using FR98RP to reach V\u001e0 reduced resilience to only 24%, causing oil leakage at joints after long\u001eterm service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>An\u00e1lisis:<\/em>&nbsp;FR98RP significantly lowered crosslink density (MH\u001eML only 8.45 lbf\u00b7in), resulting in incomplete elastic network and poor recovery after compression.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Soluci\u00f3n:<\/em>&nbsp;Switched to FR99RP at the same loading.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Result:<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UL94 V\u001e0: maintained<\/li>\n\n\n\n<li>Resilience: from 24% to 33%<\/li>\n\n\n\n<li>Crosslink density (MH\u001eML): from 8.45 to 12.53 lbf\u00b7in<\/li>\n\n\n\n<li>Tensile strength: 9.23 MPa (comparable to FR98RP\u2019s 9.43 MPa)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Lessons learned:<\/em>&nbsp;For dynamic sealing applications, resilience is as important as flame retardancy. FR99RP\u2019s \u201chigh crosslink density + high resilience\u201d makes it a superior&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>flame retardant for NBR oil resistant rubber products<\/strong><\/u><\/strong><u>&nbsp;and an excellent&nbsp;<\/u><strong><u><strong>UL94 V0 flame retardant for NBR hydraulic hose compounds<\/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\">Case 3: Silicone sealant flame\u001eretardant formulation \u2013 FR76RP application<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Background:<\/em>&nbsp;A building sealant manufacturer needed a product compliant with GB\/T 24267\u001e2009 for high\u001erise fire stops.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Problem:<\/em>&nbsp;Using ATH as flame retardant required &gt;60% loading to meet requirements, but caused severe loss of flow, difficult extrusion, and reduced adhesion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Soluci\u00f3n:<\/em>&nbsp;Replaced ATH with FR76RP at about 50% by volume in 107 base polymer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Result:<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flame rating: compliant with GB\/T 24267\u001e2009<\/li>\n\n\n\n<li>Dispersion: glossy, bubble\u001efree appearance<\/li>\n\n\n\n<li>Flow: good, easy application<\/li>\n\n\n\n<li>Adhesion: maintained<\/li>\n\n\n\n<li>Environmental compliance: halogen\u001efree, REACH\/RoHS compliant<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Lessons learned:<\/em>&nbsp;Silicone sealant flame retardancy cannot simply copy rubber formulation logic. FR76RP\u2019s particle size and surface treatment are optimised for silicone systems, achieving a balance of \u201cflame retardancy + processability + adhesion\u201d \u2013 a true<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><u>&nbsp;<\/u><strong><u><strong>non halogen fire retardant for silicone sealant applications<\/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 in Flame\u001eRetardant Rubber and FR99RP Countermeasures<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failure mode 1: Seal failure under high\u001etemperature service<br><em>Symptoms:<\/em>&nbsp;Seals lose sealing function after long\u001eterm service at 80\u001e120\u2103&nbsp;due to increased compression set.<br><em>Root cause:<\/em>&nbsp;Flame retardant affects network stability; crosslinks break or rearrange at high temperatures, losing elastic recovery.<br><em>FR countermeasure:<\/em>&nbsp;FR99RP compression set at 120\u2103\u00d724h is only 31.43%, far better than the competitor\u2019s 52.94%, demonstrating excellent thermal stability of the crosslinking network.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failure mode 2: Surface cracking after thermo\u001eoxidative aging<br><em>Symptoms:<\/em>&nbsp;Crazing on surface, sharp drops in tensile strength and elongation.<br><em>Root cause:<\/em>&nbsp;Decomposition products catalyse oxidation, accelerating chain scission.<br><em>FR countermeasure:<\/em>&nbsp;FR99RP retains 96.5% tensile strength (change \u001e3.54%) and 81.7% elongation (change \u001e18.31%) after aging \u2013 truly a&nbsp;<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>rubber flame retardant with low heat aging degradation<\/strong><\/u><\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failure mode 3: Molten drips during combustion causing secondary fires<br><em>Symptoms:<\/em>&nbsp;Rubber or sealant produces hot drips that ignite underlying materials.<br><em>Root cause:<\/em>&nbsp;Some flame retardants cannot form stable char and melt drip.<br><em>FR countermeasure:<\/em>&nbsp;FR76RP forms a viscous crust in silicone with anti\u001edrip properties; FR99RP forms a ceramic monolith char with no drips.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failure mode 4: Migration and contamination of contact surfaces<br><em>Symptoms:<\/em>&nbsp;Flame retardant migrates to the surface over time, contaminating metals or electronic components.<br><em>Root cause:<\/em>&nbsp;Poor compatibility, low molecular weight.<br><em>FR countermeasure:<\/em>&nbsp;Surface\u001eactivated FR series have strong bonding with 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: Choosing Between FR99RP and FR76RP<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Choose FR99RP when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Base material is\u00a0organic rubber such as EPDM, NBR, NR, SBR, CR, IIR, ACM.<\/li>\n\n\n\n<li>UL94 V\u001e0\u00a0is required.<\/li>\n\n\n\n<li>Retention of properties after heat aging\u00a0is critical (long\u001eterm high\u001etemperature service).<\/li>\n\n\n\n<li>Low compression set\u00a0is needed (seals, gaskets).<\/li>\n\n\n\n<li>High resilience\u00a0is required (dynamic sealing, anti\u001evibration).<\/li>\n\n\n\n<li>Processing efficiency\u00a0is pursued (short cure time).<\/li>\n\n\n\n<li>Applications in railway, automotive, cable, industrial rubber goods \u2013 making it a versatile\u00a0<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>rubber fire retardant additive supplier\u2019s<\/strong><\/u><\/strong><\/a>\u00a0top recommendation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Choose FR76RP when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Base material is\u00a0silicone sealant \/ silicone rubber.<\/li>\n\n\n\n<li>Excellent dispersion\u00a0and\u00a0glossy appearance\u00a0are required.<\/li>\n\n\n\n<li>Anti\u001edrip\u00a0performance is needed.<\/li>\n\n\n\n<li>Adhesion\u00a0and\u00a0dimensional stability\u00a0are important.<\/li>\n\n\n\n<li>Building flame\u001eretardant sealants per GB\/T 24267\u001e2009.<\/li>\n\n\n\n<li>Electronic potting, EV battery pack sealing \u2013 an ideal\u00a0silicone sealant flame retardant\u00a0and\u00a0non halogen fire retardant for silicone sealant applications.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Choose FR98RP only when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LOI\u00a0is the absolute top priority, and you accept the trade\u001eoffs in tensile strength, cure time, compression set and resilience.<\/li>\n\n\n\n<li>Not recommended for routine selection.<\/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\">Lifecycle Analysis<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FR99RP in EPDM seals \u2013 performance evolution<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Early stage (0\u001e6 months):<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excellent dispersion and low interference with curing ensure high initial consistency.<\/li>\n\n\n\n<li>Smooth surface, good dimensional accuracy.<\/li>\n\n\n\n<li>Stable V\u001e0 flame retardancy.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Mid stage (6 months \u2013 3 years):<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Heat aging advantages emerge \u2013 slow hardness rise, high retention of tensile strength and elongation.<\/li>\n\n\n\n<li>Low compression set maintains sealing function.<\/li>\n\n\n\n<li>Good weatherability and ozone resistance (EPDM matrix + FR99RP does not impair these).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Late stage (&gt;3 years):<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Service life extended by about 40\u001e60% compared to FR98RP formulations.<\/li>\n\n\n\n<li>Char\u001eforming ability ensures flame retardancy throughout the lifecycle.<\/li>\n\n\n\n<li>Lower maintenance and replacement frequency, clear total cost advantage.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">FR76RP in silicone sealants:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Early: glossy, dimensionally stable, good adhesion.<\/li>\n\n\n\n<li>Mid: water\u001eresistant, mould\u001eresistant, stable flame retardancy.<\/li>\n\n\n\n<li>Late: stable high\u001elow temperature performance, no powdering or cracking.<\/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 and Compliance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FR99RP and FR76RP comply with or can pass the following standards:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>REACH (EC 1907\/2006)\u00a0\u2013 SVHC testing passed, making us a dependable\u00a0<a href=\"https:\/\/sanezenrubber.com\/es\/product\/\"><strong><u><strong>REACH compliant flame retardant supplier<\/strong><\/u><\/strong><\/a><strong>.<\/strong><\/li>\n\n\n\n<li>RoHS 2.0 (2011\/65\/EU)\u00a0\u2013 including 2015\/863 amendment on four phthalates.<\/li>\n\n\n\n<li>WEEE (2012\/19\/EU)\u00a0\u2013 compliant.<\/li>\n\n\n\n<li>UL94 V\u001e0\u00a0\u2013 achievable in both rubber and silicone formulations.<\/li>\n\n\n\n<li>GB\/T 24267\u001e2009\u00a0\u2013 for building flame\u001eretardant sealants (FR76RP application).<\/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 certification numbers, please refer to the product TDS and 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\">Q1: What is the core difference between FR99RP and FR98RP?<br><em>Short Answer:<\/em>&nbsp;FR99RP is the next\u001egeneration product, superior in mechanical properties, heat aging, compression set and resilience, but with lower LOI.<br><em>Detailed Answer:<\/em>&nbsp;FR98RP has 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 and 21% lower resilience. FR99RP sacrifices some LOI for comprehensive balance \u2013 better for most engineering applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q2: Which rubbers is FR99RP suitable for?<br><em>Short Answer:<\/em>&nbsp;EPDM, NBR, NR, SBR, CR, IIR, ACM, etc.<br><em>Detailed Answer:<\/em>&nbsp;FR99RP has been systematically verified in EPDM and NBR with excellent results; for other rubbers, formulation validation is recommended. As an&nbsp;<strong>EPDM flame retardant manufacturer<\/strong>, we have extensive data for EPDM systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q3: What is the difference between FR76RP and FR99RP?<br><em>Short Answer:<\/em>&nbsp;FR76RP is for silicone sealants; FR99RP is for organic rubbers.<br><em>Detailed Answer:<\/em>&nbsp;FR76RP has finer particle size (D50 1\u001e2 \u03bcm) and specialised surface treatment, giving excellent dispersion, glossy appearance and anti\u001edrip in silicone. FR99RP performs best in EPDM\/NBR and other rubbers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q4: What is the recommended dosage of FR99RP?<br><em>Short Answer:<\/em>&nbsp;60\u001e130 phr.<br><em>Detailed Answer:<\/em>&nbsp;Adjust based on hardness, physical properties, flame rating and processing; roughly 6\u001e8 phr increases hardness by 1 Shore A, 3\u001e5 phr increases LOI by 1 unit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q5: What is the dosage of FR76RP in silicone sealants?<br><em>Short Answer:<\/em>&nbsp;About 50% by volume.<br><em>Detailed Answer:<\/em>&nbsp;Can be adjusted according to properties, flame rating and processing requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q6: Do FR series products contain halogens?<br><em>Short Answer:<\/em>&nbsp;No.<br><em>Detailed Answer:<\/em>&nbsp;They contain no PBB, PBDE, chlorine, fluorine or antimony trioxide \u2013 truly&nbsp;<strong>halogen free flame retardant<\/strong>&nbsp;products.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q7: Does FR99RP affect vulcanisation speed?<br><em>Short Answer:<\/em>&nbsp;Less than FR98RP.<br><em>Detailed Answer:<\/em>&nbsp;In EPDM 70 Shore A, TC90 for FR99RP\u001e100 is 112 s vs 221 s for FR98RP\u001e100 \u2013 less interference, higher productivity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q8: How is the heat aging performance of FR99RP?<br><em>Short Answer:<\/em>&nbsp;Excellent.<br><em>Detailed Answer:<\/em>&nbsp;After 100\u2103\u00d770h, hardness change only +3 points, tensile change \u001e3.54%, elongation change \u001e18.31%, all far better than FR98RP \u2013 a genuine&nbsp;<strong>rubber flame retardant with low heat aging degradation<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q9: What is the compression set of FR99RP?<br><em>Short Answer:<\/em>&nbsp;31.43% (120\u2103\u00d724h).<br><em>Detailed Answer:<\/em>&nbsp;In EPDM 70 Shore A, FR99RP\u001e100 gives 31.43% vs FR98RP\u001e100\u2019s 52.94% \u2013 significantly longer seal life.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q10: Does FR76RP provide anti\u001edrip in silicone sealants?<br><em>Short Answer:<\/em>&nbsp;Yes.<br><em>Detailed Answer:<\/em>&nbsp;FR76RP forms a viscous crust upon heating with anti\u001edrip properties, preventing secondary fires from molten drips \u2013 a key feature for a&nbsp;<strong>silicone sealant flame retardant<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q11: What is the storage stability of FR99RP?<br><em>Short Answer:<\/em>&nbsp;2\u001eyear shelf life.<br><em>Detailed Answer:<\/em>&nbsp;Store in dry, cool, sealed conditions (approx. 25\u2103); shelf life about 2 years.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q12: Are FR series products UL certified?<br><em>Short Answer:<\/em>&nbsp;Mature EPDM formulations containing FR series have passed UL certification.<br><em>Detailed Answer:<\/em>&nbsp;SaneZen Group\u2019s mature EPDM formulations with GreenThinking\u00ae FR series have obtained UL certification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q13: How is the processability of FR99RP?<br><em>Short Answer:<\/em>&nbsp;Excellent.<br><em>Detailed Answer:<\/em>&nbsp;Surface\u001eactivated fine particles give good dispersion, good flow, stable dimensions, easy extrusion, low mixing energy, and shorter cure times.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q14: Is FR76RP suitable for coloured silicone sealants?<br><em>Short Answer:<\/em>&nbsp;Evaluation recommended.<br><em>Detailed Answer:<\/em>&nbsp;FR76RP has brightness (L*) &gt;92.5, light colour; minimal impact on light shades, negligible on dark systems. Colour matching tests are advised.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q15: How does FR99RP compare to FR98RP in NBR?<br><em>Short Answer:<\/em>&nbsp;FR99RP gives better resilience.<br><em>Detailed Answer:<\/em>&nbsp;In NBR, FR99RP resilience 33% vs FR98RP 24%, and higher crosslink density (MH\u001eML 12.53 vs 8.45 lbf\u00b7in) \u2013 more advantageous for dynamic sealing applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q16: What are the physical and chemical specifications of FR76RP?<br><em>Short Answer:<\/em>&nbsp;D50 1\u001e2 \u03bcm, density 2.35 g\/cm\u00b3, BET 15 m\u00b2\/g.<br><em>Detailed Answer:<\/em>&nbsp;Typical properties: residue &lt;0.22% (10\u03bcm wet sieve), density 2.35 g\/cm\u00b3, brightness L*&gt;92.5, pH 9.8, moisture &lt;1.0%, BET 15 m\u00b2\/g, oil absorption 25 ml\/100g, MgO equivalent 39.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q17: Is FR99RP suitable for CR (chloroprene rubber)?<br><em>Short Answer:<\/em>&nbsp;Yes.<br><em>Detailed Answer:<\/em>&nbsp;FR99RP can be used in CR and other polar rubbers; small\u001escale trials are recommended.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q18: Does FR76RP comply with GB\/T 24267\u001e2009?<br><em>Short Answer:<\/em>&nbsp;Yes.<br><em>Detailed Answer:<\/em>&nbsp;FR76RP in silicone sealants meets GB\/T 24267\u001e2009 \u201cFlame retardant sealants for building\u201d.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q19: How does FR99RP affect compound hardness?<br><em>Short Answer:<\/em>&nbsp;Approximately 1 Shore A per 6\u001e8 phr.<br><em>Detailed Answer:<\/em>&nbsp;Adding 6\u001e8 phr increases hardness by about 1 Shore A, depending on the base formulation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q20: How can I obtain samples and technical support?<br><em>Short Answer:<\/em>\u00a0Contact SaneZen Group.<br><em>Detailed Answer:<\/em>\u00a0Technical data sheets, samples and formulation support are available through the SaneZen Group official website or regional sales representatives.<\/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\/1-1024x763.png.webp\" alt=\"FR series fire retardant comply with REAXH, Rohs\" class=\"wp-image-4597\" srcset=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-1024x763.png.webp 1024w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-300x223.png.webp 300w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-768x572.png.webp 768w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-16x12.png.webp 16w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-500x372.png.webp 500w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/1-600x447.png.webp 600w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/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\/2-1024x766.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-4598 lazyload\" data-srcset=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-1024x766.png.webp 1024w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-300x224.png.webp 300w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-768x575.png.webp 768w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-16x12.png.webp 16w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-500x374.png.webp 500w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2-600x449.png.webp 600w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/2.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\">Key Takeaways<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>FR99RP is a new\u001egeneration phosphorus\u001enitrogen intumescent\u00a0<strong>halogen free flame retardant<\/strong>\u00a0that achieves UL94 V\u001e0 in EPDM, NBR and other rubbers, while delivering superior tensile strength, heat aging resistance, compression set and resilience compared to FR98RP \u2013 it is the\u00a0<strong>rubber chemical to achieve V0 flammability without property loss<\/strong>.<\/li>\n\n\n\n<li>Comparative data show FR99RP has 46.8% higher tensile strength, 49.3% shorter cure time, 68.5% lower compression set and 21% higher resilience than FR98RP \u2013 trading some LOI for comprehensive performance balance.<\/li>\n\n\n\n<li>FR76RP is a dedicated\u00a0<strong>silicone sealant flame retardant<\/strong>\u00a0with ultra\u001efine particle size (D50 1\u001e2 \u03bcm), excellent dispersion and anti\u001edrip properties; about 50% by volume in silicone compounds achieves required flame retardancy.<\/li>\n\n\n\n<li>FR series are compliant with REACH, RoHS 2.0 and WEEE, free from PBB, PBDE, chlorine, fluorine and antimony trioxide \u2013 backed by a\u00a0<strong>REACH compliant flame retardant supplier<\/strong>.<\/li>\n\n\n\n<li>Selection advice: organic rubbers \u2192 FR99RP; silicone sealants\/silicone rubber \u2192 FR76RP; consider FR98RP only when LOI is the sole priority.<\/li>\n<\/ul>\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\u5708-1024x765.png.webp\" alt=\"Factory and company structure picture\" class=\"wp-image-4599 lazyload\" data-srcset=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-1024x765.png.webp 1024w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-300x224.png.webp 300w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-768x574.png.webp 768w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-1536x1147.png.webp 1536w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-2048x1530.png.webp 2048w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-16x12.png.webp 16w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-500x373.png.webp 500w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u5de5\u5382\u52a0\u5708\u5708-600x448.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\u6784-1024x695.png.webp\" alt=\"Factory and company structure picture\" class=\"wp-image-4600 lazyload\" data-srcset=\"https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-1024x695.png.webp 1024w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-300x204.png.webp 300w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-768x522.png.webp 768w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-1536x1043.png.webp 1536w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-2048x1391.png.webp 2048w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-18x12.png.webp 18w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-500x340.png.webp 500w, https:\/\/sanezenrubber.com\/wp-content\/smush-webp\/2026\/09\/\u7ec4\u7ec7\u67b6\u6784-600x407.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;<strong>f\u00e1brica de retardantes de llama libres de hal\u00f3genos<\/strong>, but also a specialty chemical supplier with practical compounding experience in rubber and silicone rubber production. We are a&nbsp;<strong>rubber flame retardant additive manufacture<\/strong>&nbsp;that produces and validates its own products, a&nbsp;<strong>UL94 V0 halogen free flame retardant supplier<\/strong>&nbsp;with proven V\u001e0 formulations, and a&nbsp;<strong>low smoke flame retardant manufacturer<\/strong>&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&nbsp;series&nbsp;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&nbsp;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\/\">www.sanezenrubber.com<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>This article systematically presents the technical mechanisms, performance comparisons, and engineering selection guides for GreenThinking\u00ae FR series&nbsp;halogen free flame retardant&nbsp;products \u2013 FR99RP and FR76RP. FR99RP is developed for EPDM, NBR and other rubber compounds, achieving UL94 V\u001e0 rating while maintaining excellent tensile strength, heat aging resistance, low compression set and high resilience. FR76RP is specially [&hellip;]<\/p>","protected":false},"author":2,"featured_media":4598,"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-4596","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\/4596","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=4596"}],"version-history":[{"count":1,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/posts\/4596\/revisions"}],"predecessor-version":[{"id":4601,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/posts\/4596\/revisions\/4601"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/media\/4598"}],"wp:attachment":[{"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/media?parent=4596"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/categories?post=4596"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sanezenrubber.com\/es\/wp-json\/wp\/v2\/tags?post=4596"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}