heat resistant temperature: 1200 degreeC Clear quartz plate,quartz plate,quartz sheet,quartz disc, quartz panel Technique index sign : 1.Material:Quartz glass JGS1.JGS2.JGS3 either through the far ultraviolet, but also through the visible and near infrared spectroscopy.Very small thermal expansion coefficient, chemical stability, bubbles, stripes, uniformity, there can birefringence comparable ...