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