BMC (bulk molding compound) or DMC (double molding compound) is called bulk molding compound (formerly known as BT-3), which, like sheet molding compound, is a thermosetting molding compound reinforced with short cut fibers.
Nowadays, in the United States, Japan, and China, BMC and DMC generally refer to the same material. According to the definition of SPI in the United States, BMC is chemically thickened DMC.
It has a series of excellent physical functions such as impact resistance, compression resistance, bending resistance, tensile resistance, high electrical capacity, high surface resistance, high insulation strength, high arc resistance, non-toxic corrosion resistance, flame retardancy, etc. It particularly has good fluidity, low molding pressure, short molding time, and low molding temperature.
It is 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、 Car industry: car body, bumper, headlight bracket, headlight bowl, trunk and other interior components and functional parts.
3、 Surface industry: surface racks, surface shells, control levers, etc.
4、 Civilian products: sanitary ware, decorations, dishwasher liners, utensils, etc. (66-10MW microwave oven vessel specific BMC material, non-toxic and heat-resistant)
Five other aspects: electronic copiers, printing machinery, structural components of operating machinery, electronic computer parts, etc. The basic characteristics of BMC are: mostly chemically thickened; Fiberglass content between 9% and 25% is superior to SMC (abbreviation for Sheet Molding Compound, which has superior electrical performance, corrosion resistance, lightweight, simple engineering design, and flexible benefits. Its mechanical function can be comparable to some metal materials, so it is widely used in transportation vehicles, construction, electronics/electrical and other professions.) Therefore, its physical and mechanical functions are slightly lower; The short cutting length scale is 3-25mm; The filler content is mostly higher than SMC; The material flowability, molding processability, and apparent quality of the product will be better than SMC; Products with intricate and disordered structures such as thin walls and narrow shapes highlight their advantages. But the molding conditions, process handling, defect countermeasures, and mold methods are all similar to SMC technology.
