... glass plates tube,optical glass,quartz glass. The temperature of softening point of quartz glass is about 1730 ,May use for a ... highest using may reach 1450!Besides the fluorine acid of removal of hydrogen embrittlement, quartz glass nearly does not occur chemical ... ,Its acidresisting ability is the 30 times of porcelain, the 150 times of stainless steel ,Especially under high temperature chemical ...