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Silica Quartz Sand. September 16, 2017 ·. Skylark Engineering is a professional manufacturer of fused silica and Micro-silica powder, which are widely used as materials for Optical glass, Artificial Marble, Electrical, Epoxy Molding Compound (EMC), Paints, Coating, Ceramic, Foundry, Precision Casting, Refractory and Abrasives industries etc.