... content:0.5% •IntroductionQuartz Sand is manufactured from natural quartz stone,it 's high content of SiO2, low impurity, ... optical fiber, fused quartz glass tube , rod and crucible which can be used in fiber communication, lighting and semiconductor industry ... ,Anthracite Filter Media,Walnut Shell Filter,Manganese Sand Filter,Quartz Fiter Sand,Ceramic Filter Sand,Biological Particulate Filters. For ...