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Food-grade silica gel is non-toxic and tasteless, has no toxic and side effects to the human body, and has stable chemical properties. Under normal conditions, it does not react with any acid, alkali and salt except caustic alkali and hydrofluoric acid. It has the advantages of high transparency, no yellowing, no blooming, etc., especially to solve the problems of black hose blooming, blue products fading, soft, high tear resistance, high insulation, abrasion resistance, high temperature resistance, flame retardant It has the advantages of resistance, aging resistance, environmental protection, tensile strength, stable performance and so on.