GreenThinking^®PF91 is an insulating nano reinforcing agent with hydroxyl removal and surface activation treatment, which is refined by processing selected non-conductive high-whiteness natural composite mineral raw materials, retaining raw materials through special processing technology and strict internal quality control process, so that the products have uniform chemical purity and stable particle size distribution. Most of the particle sizes are distributed in the nanometer level, the porosity is large, the impurity is less, and the surface is activated. As a reinforcing functional filler in the rubber and plastic industry, it has outstanding advantages such as good insulation, good dispersion, high reinforcement and high whiteness, and is widely used in rubber and plastic industries.