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By certification 
Silica sand for optical glass for its high content of sio2 and low impurity.
Refined silica sand is processed from natural silica stone for its high content of sio2 and low impurity
free sample is available
1.not more than 1000g of each grit,only need to pay the express freight charges
2.more than 1000g, please purchase the sample
Refined silica sand is processed from natural silica stone for its high content of sio2 and low impurity
free sample is available
1.not more than 1000g of each grit,only need to pay the express freight charges
2.more than 1000g, please purchase the sample
