Introduction to SMC sheet molding compound

SMC is a semi dry process molding intermediate material for manufacturing glass fiber reinforced thermosetting products. It is made by pre mixing unsaturated polyester resin, low shrinkage/low profile additives, initiators, internal release agents, mineral fillers, etc. into a paste, and then adding thickeners, coloring agents, etc. to mix evenly. The short cut glass fibers are fully impregnated and thickened to form a sheet-like structure; SANDWICH type sandwich; Structure

SMC molding process is currently one of the most advanced and important methods for forming glass fiber reinforced plastics

SMC materials have good reproducibility and are less affected by operator and external factors

4. High production efficiency, short molding cycle, easy to achieve fully automated mechanized operation, and relatively low production costs

5. Good fluidity, capable of forming shaped products and structures (such as complex structures such as ribs, platforms, embedded parts, etc.)

6. The obtained product has a high surface finish, and the use of low shrinkage additives results in a more ideal surface quality

7. It can achieve good interior coloring decoration effect

8. It can achieve good flame retardancy, insulation, thermal insulation, and corrosion resistance

Introduction to BMC bulk molding compound

SMC is a semi dry process intermediate material for manufacturing glass fiber reinforced thermosetting products. It is made by pre mixing unsaturated polyester resin, low shrinkage/low profile additives, initiators, internal release agents, mineral fillers, etc. into a paste, and then adding thickeners, coloring agents, etc., and mixing with glass fibers of different lengths in a dedicated material kettle for thickening process, finally forming a clustered intermediate material that can be used for molding and injection molding

BMC material has excellent dimensional accuracy and stability, with minimal deformation

3. The coefficient of linear expansion is small

4. Excellent rigidity and heat resistance

The design of products with significant changes in wall thickness is feasible and can be subjected to low-pressure forming

6. Excellent mechanical strength, electrical performance, and sound characteristics



SMC/BMC composite material forming process technology information

Injection molding process parameters

Molding: 110/150 Pa Mold temperature: 135/170 ° C; C curing time: 12/25 seconds/millimeter

Molding process parameters

Molding: 50/100 Pa Mold temperature: 140/160 ° C; C curing time: 20/40 seconds/millimeter



BMC/SMC series molding materials are widely used in the following fields:

1、 Electrical and electronic components: shells and structural components of various high and low voltage electrical switches, explosion-proof electrical components for chemical and mining industries, overall packaging of motors and solenoid valves, busbar frames, terminal blocks, insulation rods, insulators, various specifications of insulation boards, etc.

2、 Automotive industry: car body, bumper, headlight bracket, headlight bowl, trunk and other interior and exterior components and functional parts.

3、 Instrument industry: instrument racks, instrument housings, control levers, etc.

4、 Civilian products: sanitary ware, decorations, dishwasher liners, audio products, etc.

5、 Other aspects: structural components of electronic copiers, printing machinery, office machinery, electronic computer parts, etc.

Yongshengyi Mold Products Co., Ltd. provides the following services for you:

1. Professional BMC and SMC mold design and manufacturing

2. BMC and SMC products hot press forming