Superior electrical insulation, heat resistance, and dielectric properties make Bulk Molding Compound (BMC) and Sheet Molding Compound (SMC) an excellent choice for insulating components of switch gear, circuit breakers, stand off insulators, and motor brush holders.

Thermoset composite materials exhibit excellent dielectric strength due to the network of cross-linked molecules that create a rigid structure, where molecules are held in place by chemical bonds. Compounds made with thermoset binders, therefore, have the ability to maintain both physical and electrical properties under mechanical loads during prolonged exposure to elevated temperatures.

Often, parts molded from plastic materials will carbonize or melt during exposure to electrical arcing or tracking. However, thermoset materials demonstrate minimal effects in these situations and have Comparative Tracking Index (CTI) values exceeding 600 volts and dielectric strengths in excess of 15 kv/mm. This, along with excellent thermal properties, makes BMC and SMC molding compounds an ideal choice to protect sensitive electrical output devices operating in high-temperature environments.

Typical applications include:

• Electrical connectors, shrouds, circuit breaker housings, and contact blocks
• Motor mounts, brush cards, brush holders, and starter housings
• Electric switchgear
• Electrical insulator parts
• Electrical junction boxes