Diameter 10~13um fiber glass chopped strands for BMC are compatible with unsaturated polyester, epoxy resin and phenolic resin. Suitable for the mold molding, transfer molding and injection molding technology, products of good mechanical performance, high dimensional stability and good surface finish, good water resistance, oil resistance, corrosion resistance, heat resistance, excellent electric properties, especially the arc resistance can reach about 190 s. Resin sizing agent in formula, the main ingredients with the sheet molding compound, packing, generally without thickening agent, then resin sizing agent and chopped glass fiber length (about 3 ~ 25 mm) fully mixing system. Mainly used in electrical, motor, radio, instrument, machinery manufacturing, chemical equipment, construction, transportation, defense and other departments.