Product Introduction BMC polyester/vinyl ester group molding compounds
BMC (bulk molding compound) or DMC (dough molding compound), also known as bulk molding compound (formerly known as BT-3), is a mass chopped fiber-reinforced thermosetting composite. Nowadays in the United States, Japan and China, BMC and DMC usually refer to the same material, according to the definition of SPI in the United States, BMC is chemically thickened DMC.
Bulk molding compound (BMC) is an adhesive putty-like substance synthesized from resins, fiber-reinforced materials, and several other components. 5-30% of the BMC is fiber-reinforced, and the fiber lengths range from 3 mm to 25 mm in chopped glass fibers according to requirements.
BMC is suitable for compression, transfer or injection molding.
BMC production process
BMC characteristics
Bulk molding compounds (BMCs) offer good flame and tracking resistance, superior dielectric strength and corrosion resistance, stain resistance, excellent mechanical properties, minimal shrinkage, and stable color. The surface is easy to powder spray, paint and other coating techniques. It has a series of excellent physical properties such as impact resistance, compression resistance, bending resistance, tensile resistance, high capacitance, high surface resistance, high dielectric strength, high arc resistance, non-toxic corrosion resistance, flame retardant, etc., especially with good fluidity, low molding pressure, short molding time, low molding temperature and other excellent molding characteristics, and is widely used in various electrical products (such as circuit breakers, contactors), home appliances, automotive engine parts, automotive reflector covers and other fields.
Each of our formulations is specially customized according to your needs to stably meet your various needs for product performance and processing performance.
According to your requirements, we can provide UL certification, ROHS certification and other certifications and test reports for formulas
Comparison table of thermosetting and thermoplastic properties

Light weight and high strength

SMC/BMC is lighter than steel, aluminum, etc., and its relative density is generally 1.3~2.0g/cm3, only 1/4~1/6 of ordinary steel, and 1/3 lighter than aluminum alloy. It is 15%-50% lighter than steel, which can achieve lightweight goals, and has good impact energy absorption, and has high tensile strength, bending strength and impact toughness.

Plenty of design freedom

The flow characteristics and molding process of SMC/BMC materials determine that many parts can be molded in one go, which can reduce the number of molds and tooling, welding, assembly and other processes, thereby significantly reducing costs and realizing low-cost operation of low-volume parts.

Strong corrosion resistance

SMC/BMC is inherently corrosion-resistant, so it does not need to be phosphated for corrosion protection and improved bonding properties.

Excellent heat resistance and paintability

SMC/BMC products have good heat resistance. After the product is demolded, it can maintain dimensional stability within -50~200°C. Excellent heat resistance to meet the use of automotive parts. SMC material is the most suitable material for steel plate spraying technology. SMC has a similar coefficient of thermal expansion and heat resistance as steel, and the coating can be cured at the same oven temperature as steel.