It (NEMA G-11) is a high performance thermoset epoxy fiberglass composite that provides higher strength than MC511AF. The product offers excellent physical, mechanical, and electrical properties at both room temperature and elevated temperatures. MC511A is chosen over high-temperature mat glass thermoset composites and high performance glass-filled thermoplastics because of its excellent machining characteristics, outstanding dimensional stability, superior creep resistance, and excellent high-temperature and performance characteristics. In use, the product is often exposed to continuous temperatures as high as 155°C for up to a decade. And in short-term applications such as insulation in aerospace and defense systems, the material withstands temperatures in excess of 300°C. Halogen free to conform to European restrictions, MC511A is specially formulated to meet exacting power generation standards requiring higher strength at elevated temperatures. The product is considered the premier material for use as Class F insulation in electrical power generation and transmission equipment. MC511A complies with the requirements of MIL-I-24768/3, Type GEB.