Overview
Bulk Molding Compound (BMC) is a fiber-reinforced thermoset composite material consisting of chopped glass fibers, mineral fillers, and a polyester or vinyl ester resin matrix. Developed in the 1950s, BMC combines the processability of plastics with the performance characteristics of engineered composites. Unlike thermoplastics, BMC undergoes irreversible curing during molding, resulting in a rigid, dimensionally stable product. The material is particularly valued for its ability to produce complex, high-tolerance parts with excellent surface finish in high-volume compression or injection molding processes.
Physical and Chemical Properties
BMC exhibits a unique combination of mechanical, electrical, and thermal properties. Typical formulations show tensile strength of 30-60 MPa, flexural strength of 70-150 MPa, and heat deflection temperatures of 200-250°C. The glass fiber content (usually 15-30%) significantly enhances mechanical performance. Chemically, BMC demonstrates excellent resistance to water, acids, alkalis, and solvents. Its flame retardant grades typically achieve UL94 V-0 rating without containing halogens. The material's low coefficient of thermal expansion (20-30 x 10⁻⁶/°C) ensures dimensional stability across temperature ranges encountered in most applications.
Main Applications
The electrical industry accounts for approximately 40% of BMC consumption, where it's used for circuit breakers, switchgear components, and insulator housings. Its arc resistance and tracking resistance make it ideal for high-voltage applications. In automotive manufacturing, BMC appears in headlight reflectors, ignition components, and under-hood parts. The appliance industry utilizes BMC for motor housings, cooker handles, and other heat-resistant components. Recent developments include halogen-free formulations for eco-sensitive applications and low-density variants for weight reduction.
Safety and Storage
Pre-cured BMC presents minimal health risks, requiring only basic protective equipment (gloves, safety glasses) during handling. However, machining cured BMC generates dust containing glass fibers, necessitating proper ventilation and respiratory protection. Storage requires temperature control (15-25°C) in sealed containers to prevent premature curing. Humidity should be maintained below 50% to avoid moisture absorption. Shelf life depends on formulation but typically ranges 3-6 months at 23°C. Material should be brought to room temperature before use if stored in cold conditions.
B2B Procurement Guide
When sourcing BMC, buyers should clearly specify mechanical requirements (tensile/flexural strength), electrical properties (dielectric strength, CTI), and thermal performance (HDT, flammability rating). Color requirements (standard or custom) and regulatory compliance (UL, FDA, RoHS) should be established upfront. For large-volume purchases (10+ tons), consider negotiating formulations with reduced filler content for better flow characteristics. Lead times typically range 2-4 weeks for standard formulations, longer for specialty grades. Quality certifications (ISO 9001, IATF 16949) are essential for automotive and electrical applications.
Related Manufacturers
- 主营：冷却塔、抗菌板、绝缘板、模塑料、石墨匣钵、复合团料、复合材料、防静电环氧板、配电箱隔热板、无碱玻璃纤维、碳纤维预浸料、冷却散热水塔、沥青基碳纤维、碳纤维预浸布
- 主营：阻燃剂、胶黏剂、群青紫、脱模胶、黑色粉、氧化剂、颜料浆、润滑油、成核剂、电子胶、胶粘剂、增韧剂、抗氧剂、真空泵、静电剂、纽碧莱、苯乙烯、蜡助剂、润滑剂、材级pvc、爽滑剂、铁氟龙、润湿剂、抗菌剂、美缝剂
- 主营：酚醛玻璃纤维模塑料、酚醛模塑料、酚醛增强模塑料、酚醛玻璃纤维增强模塑料
- 主营：回收化工原料、回收维生素、回收减水剂、回收日化原料、收购碘化钾、化工厂废料、回收赤砂糖、回收含糖废水、回收化学试剂、回收二甲基硅油、回收引气剂、回收化工废溶剂
- 主营：超高分子板、高分子聚乙烯板、高分子加工件、高分子塑料加工件、链条导轨、聚乙烯板、PP板、pe板、陶瓷衬板、高分子板、车厢滑板、煤仓衬板、支腿垫板、含油mc尼龙板、聚乙烯链条导轨、尼龙加工件、滑块垫块、超高分子聚乙烯板、尼龙板、高分子板加工、聚乙烯加工件、尼龙棒、聚乙烯滑块、HDPE板
- 主营：优氯净、甘氨酸、切削液、水杨酸、硫酸锰、平平加、滑石粉、牛磺酸、白僵菌、磷酸铁、铵明矾、蛋白胨、碳酸镁、磷酸铝、戊二醛、纤维素、硫化钠、硫化钡、黄蜂蜡、硫化钙、氯化锌、氯化锰、氧化锑、氧化锆、氧化锌
- 主营：碘酸钾、磷酸镁、维生素c、脱模剂、维生素b1、维生素b6、维生素d3、二硫化钼、吡啶硫铜、香草香精、芥酸酰胺、乙基纤维素、次氯酸钙、九水硫化钠、EVA乳液、水玻璃、硅酸钠
- 主营：化工
- 主营：优氯净、甘氨酸、切削液、二萘酚、桦焦油、甘露醇、水杨酸、硫酸锰、平平加、肌氨酸、磷酸氢、磷酸镁、牛磺酸、磷酸铁、铵明矾、蛋白胨、碳酸镁、磷酸铝、戊二醛、氯化锰、纤维素、黄糊精、硫化钠、硫化钡、木质素
- 主营：干燥机、混合机、制粒机、粉碎机、造粒机、振动流化床干燥机、真空耙式干燥机、空心桨叶干燥机、旋转闪蒸干燥机、离心喷雾干燥机、沸腾制粒干燥机、旋转制粒机、摇摆颗粒机、湿法混合制粒机、螺杆挤压造粒机、污泥烘干机、热风循环烘箱、摇摆制粒机、沸腾制粒机、沸腾干燥机、湿法制粒机、流化床干燥机、耙式干燥机、桨叶干燥机、闪蒸干燥机
- 主营：磷酸硼、阻燃剂、切削液、提高剂、封口蜡、皂化油、催化剂、钒酸铋、锡酸钠、水杨酸、硫酸锰、梅栲胶、蒸馏水、锡酸钾、防染盐、苯甲醇、融冰剂、油酸钠、增进剂、磷酸铁、聚甘油、芥末油、碳酸镁、磷酸铝、络合剂
- 主营：缠绕垫、高温胶、石棉垫、塑料板、石墨引、隔热布、隔热带、绝缘纸、橡胶圈、黑四氟、耐火绳、圆垫片、密封带、复合带、回转轴、石墨绳、密封绳、油盘根、乙烯垫、真空泵、石墨垫、密封纸、全棉带、石棉带、氟龙板、圆编绳
- 主营：整合剂、阻燃剂、甲醇钠、封口蜡、硫酸锆、溴氨酸、磷酸铁、磷酸铝、椰油胺、叔丁醇、氯铂酸、浮选剂、颜料蓝、去除剂、乙硫氮、黄蜂蜡、abs树脂、脂肪酶、除磷剂、皂角苷、三甘醇、碳酸锆、甲酸铬、二乙胺、松香胺
- 主营：干冰、干冰清洗机、干冰去毛刺、块状干冰、干冰洗板机、干冰清洗设备、去毛刺设备
- 主营：电线电缆涂层
- 主营：阻燃剂、增稠剂、切削液、碱式碳酸铅珠光塑料、胶黏剂、钒酸铋、锡酸钠、溴氨酸、蒸馏水、磺酸钙、融冰剂、油酸钠、蛋白胨、聚甘油、芥末油、碳酸镁、桐油酸、硼酸锌、椰油胺、铜铬黑、醋酸钾、泛酸钙、外加剂、堵漏剂、黄原胶、浮选剂