The selection of molding materials determines the quality of Sheet Molding Compound (SMC) products to a certain extent. Appropriate raw materials can meet the special performance requirements of finished products, and the molding process is also the core priority in the manufacture of molded parts.

This paper first introduces the raw material composition of SMC molding materials, including resin, initiator, low-profile additive, chemical thickener, internal release agent, colorant and reinforcement material, and briefly illustrates the performance requirements of each component.

Secondly, it elaborates the molding process of SMC molding materials in layers, covering the type and structure of SMC sheet making units, the production process of SMC molding materials, as well as the compression molding equipment and technology for SMC.

In view of the existing problems of SMC molded products, this paper refers to several foreign improvement measures, aiming at solving defects such as surface paint blistering, solvent absorption, high density and environmental pollution, as well as optimizing the production lines of automotive parts.

Finally, the industrial application and recycling of SMC molding materials are briefly discussed. It is expected that readers can gain a new understanding of SMC composite materials through this paper.