... ,OHSAS18001 Mintolerance+/-0.2mm quartz window plate, quartz plate, quartz disc Company: Donghai Shengda Quartz Products Co., LtdCertification: ISO 9001, ISO14001 ... plate, quartz plateService: We can produce according to your size and other requirements.SiO2 content: 99.99%UV transmission : 80%-95 ... % at 253.7 nanometersApplication: lighting, semi conductor, optical and vacuum instruments,etc.