Now there are 2 sorts quartz glass products for semiconductors in China according to purity:molten from nature crystal,impurity contents(Alã€eã€Caã€Mgã€Tiã€Niã€Cuã€Coã€Mnã€Bã€Kã€Naã€Liect)<50ppm,and molten through high temperature hydrolysis from high pure tetrachlosilane,impurity of these metals<2ppm,but this product is very enpensive,besides soft point is 80’c lower than that of quartz glass made from rock crystal, ...
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