What Is Use Of Silica Sand

I am tryin to sand blast paint off of jeep rims from world war 2 used in africa and they have abrasive or scrath resistent paint on them and im usin 80 psi and a green sand that costs 160 a pound or bag and im use to soda blasting but never used any thing heavier in grain than this green silica sand and im wondering if its calcium carbide or what and this most have silica in it sometimes i.

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