... 300mm*200mm*8mm 2.working temperature:1100C=2012F 3.surface: polished 4.shape:sauqre,round,rectangler and arch et 1.size ... :300mm*200mm*8mm 2.working temperature:1100C=2012F 3.surface: polished4.shape:sauqre,round,rectangler and arch etTransparent Quartz glass ... :1.high purity,2.low coefficinet of thermal expansion,3.temperature resistance,4.corrosion resistance,5.extensive optical transmission ...