optical quartz glass plates are with high clear color, and polish them, if client need Specification:Material: JGS1, ... 60/40, 80/50Form: circle, square, ellipse, or upon requirement Quartz glass has some excellent characters, such as high temperatura resistance ... expansion, good chemical stablity, good uniformity etc. It can made quartz plate, optical lens, prismand other shape accroding to customer's ...