Bulk moulding compound

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Bulk molding compound (BMC) or bulk molding composite is a ready to mold, glass-fiber reinforced thermoset polyester material primarily used in injection moulding and compression moulding. The material is provided in bulk or logs.

BMC is manufactured by mixing strands (>1”) of chopped glass fibers in a mixer with a thermoset resin (commonly polyester resin, vinyl ester resin or epoxy resin). The glass fibers in BMC result in better strength properties than standard thermoplastic products. Typical applications include demanding electrical applications, corrosion resistant needs, appliance, automotive, and transit.

fabric or fibre's are pre-impregneted under pre-catalysed (https://en.wiktionary.org/wiki/precatalyst) resin.The catalyst is largely content at ambient temperature giving the material useful like when difrested.They are nearly solid at ambient temperature so appeared to be adhesive. The prepregs are laid on to the mold by hand.Then vacuum forged and heated to 120-180°c. this allow the resin to flow followed by carrying addition pressure can be applied by autoclave.


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