Detailed Product Description White silica was made by choiceness high qualiy ore with complex processing. My companys product was made of natural quartz ,which is made through the offal, washing and selecting.(1) Quartz sand hardness of 7.5.the proportion of 2.66.(2)Size:0.5-1mm,1-2mm,2-4mm,4-8mm,8-16mm,16-32mmIt main usage filter material,highgrade glass,precision casting spray sand .etc . ...