... in sand; 4, silicon crystal yuan of cutting; 5, tooth die of clean sand; 6, precision foundry sand; Edit this section ... or non-metal surface dirt rust removal, such as gravity die mold, rubber mold of the oxide or from the shape ... . 5, deckle edge processing: bakelite, plastics, zinc, aluminum die-casting products, electronic parts, core of burrs removal. 6, stress relieving processing: aerospace ...