In the epoxy resin, aluminum hydroxide has a significant effect of increasing the oxygen index. For example, adding 80 parts of aluminum hydroxide to 100 parts of epoxy resin, the oxygen index can be from the original 20. Increased to 27.5, such epoxy resin can be used for sealing materials, castings, epoxy glass fibers, and the like. In terms of electrical properties, aluminum hydroxide enhances the arc resistance and sag resistance of epoxy resins. Epoxy resin filled with aluminum hydroxide also has great development prospects in the production of transformers, insulation equipment, switchgear, etc. 

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