SMC is a fiber-reinforced thermoset material. The strength of glass fiber is between 10% and 60%, and the length of glass fiber is slightly longer than that of bulk molding compound (BMC). Sheet Plastic Injection Mold contains polymer resins, inert fillers, fiber reinforcements, catalysts, pigments and stabilizers, release agents and thickeners, long fibers and resins (usually epoxy resin, vinyl (ester or poly) Ester)), the resin is used to make the film into a paste; next, the fibers are chopped and added to the paste. Then squeeze between the two films; compact until the desired thickness and texture is reached.

This process can produce strong and economical SMC materials. It should be noted that the material is not fully cured during storage. When heat and pressure are applied to it, the final curing will proceed in the SMC mold, resulting in everything from simple designs to complex parts.

Compression molding is the most common choice for high-volume composite parts, usually associated with SMC (sheet molding composite) and BMC (bulk molding composite) materials. Compression molding takes place in equipment called "compression molding presses", which are usually hydraulically driven. Put the preheated SMC into the lower part of the mold. Then lower the upper plate and apply pressure up to 2000 psi to the mold. The cycle time is 1-5 minutes, depending on the size and thickness of the part. Continuous application of heat and pressure will cause the SMC to diffuse and properly fill each part of the SMC mold. Therefore, SMC Compression Mold can be used to produce complex and delicate high-precision parts.