SMC (Sheet Molding Compound) and BMC (Bulk Molding Compound) are essential molding compounds in the production of various composite products. These materials are highly valued in industries such as electrical, aerospace, and oil and gas for their lightweight, high-strength, and corrosion-resistant characteristics. Although they often share the same resins and reinforcements, each compound offers unique advantages for specific applications. This technical bulletin will detail the differences between SMC and BMC in terms of composition, processing methods, properties, applications, and cost.

SMC is ideal for flat parts or those with simple contours that require higher strength and a superior surface finish. In contrast, BMC is better suited for smaller, more intricate parts where cost-effectiveness and production efficiency are crucial. The decision between SMC and BMC typically hinges on the specific application requirements, including the necessary electrical, mechanical, and physical properties, the complexity of the part, and the desired production volume.