... in glass ,cast , Man-made stone plate ,plastic ,rubber,etc. quartz sandCrystal power is manufactured from natural high quality crystal stone ... can be used as material of producing optical fiber, fused quartz glass tube , rod and crucible which can be used in ... %If you are interested in our products, please do not hesitate to contact us.Donghai Shengda Quartz Products Co., Ltd.Tel: 86-518 ...