The Difference Between BMC Composite Materials and SMC Materials

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A qualified BMC composite material is not only water and oil resistant, but also has good corrosion resistance. In addition, it has a good service life, so we can see its presence in the manufacturing process of some electrical appliances and motors, or in the field of mechanical equipment and so on. Furthermore, as mentioned above, the common BMC composite material also offers a wide range of product sizes to choose from, so it is necessary to understand its advantages or disadvantages before purchasing and compare to obtain reasonable and reliable suggestions and solutions, so as to achieve the maximum value of the product.

Difference between BMC composite material and SMC

BMC (DMC) material is the abbreviation of Bulk (Dough) molding compounds, also known as unsaturated polyester bulk molding compound. Its main raw materials are GF (short cut glass fiber), UP (unsaturated resin), MD (filler) and various additives fully mixed into chunky pre-impregnated materials. DMC materials were first applied in West Germany and the UK in the 1960s, and then developed in the United States and Japan in the 1970s and 1980s respectively. Due to BMC bulk molding compound's excellent electrical performance, mechanical performance, heat resistance, chemical corrosion resistance, and adaptability to various molding processes, it can meet various product performance requirements. BMC composite materials are widely used in automobile manufacturing, railway transportation, building accessories, electromechanical products and other fields.

SMC is a sheet molding compound. Its main raw materials are GF (special yarn), UP (unsaturated resin), low-shrinkage additives, MD (filler) and various auxiliary agents. It first appeared in Europe in the early 1960s, and around 1965, it was developed by the United States and Japan. SMC composite materials and their SMC molded products have excellent electrical insulation performance, mechanical performance, thermal stability, and chemical corrosion resistance. Therefore, the application scope of SMC products is quite wide. The development trend now is for SMC composite materials to ultimately replace BMC materials.

Advantages of BMC composite materials

Short molding cycle, can be compression molded or injection molded, suitable for mass production.
Can add a large amount of filler, can meet flame retardancy, size stability requirements, low cost.
Complex products can be molded integrally, and inserts, holes, platforms, ribs, grooves, etc. can be molded simultaneously.
Compared with conventional thermoplastic plastics, BMC composite materials have higher heat resistance, insulation performance, elastic modulus and other properties.
Low skill requirements for workers, easy to achieve automation, saving labor.
Accurate product size.
Good working environment.