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Looking to convert USA domestic production of fused silica to imported supply for investment casting inductry. Need 1000 tons per month of fused silica. Chemical Specification: less than 0.1% each of the following metal impurities (Na, Fe, Al, Ca). Size Specification: Two major sizes are required: grain, with sizes between 20 and 40 mesh (0.84 to 0.42 mm) and powder, minus 325 mesh (less than 0.044 mm). We are looking for pricing CNF, Long Beach, California, USA. fused, silica, quartz Fused silica grain and powder