69精品久久久久久久精品a片,人人妻人人澡人人爽人人精品,少妇荡乳情欲办公室456视频,国产精久久一区二区三区

Zinc Fluorosilicate

Zinc fluorosilicate, also known as zinc hexafluorosilicate, is a colorless hexagonal crystalline or white crystalline powder. The relative density is 2.104. Easy to dissolve in water, soluble in inorganic acids, insoluble in ethanol. When heated to 100 ℃, it decomposes into silicon tetrafluoride, water, and zinc fluoride. The pH value of its 1% aqueous solution is 3.2. Used as a rapid hardening ag