Physical and chemical properties of magnesium hydroxide: Colorless cubic column crystal (solid); magnesium hydroxide is insoluble in water and alcohol, soluble in dilute acid and ammonium salt solution, featuring a medium strong base. The solubility in water (18C) is 0.0009g/100g. When heated to more than 200C in alkaline solution, it produces hexagonal crystals and decomposes into magnesium oxide and water at 350C. The magnesium hydroxide by synthetic method, due to the excellent safety, can be used in the fields of plastic, coatings, building materials, pharmaceutical, food, electronics, etc. and in the materials of PE, PVC, EVA, PU, EPDM, unsaturated polyesters, epoxy resins, rubber, etc. The products in which it is applied include coated cloth of mine air guide tube, PVC solid-woven conveyor belt, fire-retarding rubber sheet, tarpaulin, PVC wire and cable materials, mine cable sheath, cable accessories, medicines, granulated sugar refining, magnesium salt manufacturing, oil additiv