Aramid fabrics are made of heat-resistant and strong synthetic fibers used in many aerospace and military applications. They are twice as strong as E-glass, ten times as strong as aluminum and approach the strength of high strength carbon on a specific tensile strength basis. Aramids have excellent stability over a wide range of temperatures for prolonged periods and display excellent dimensional stability with a slightly negative coefficient of thermal expansion. They are resistant to chemicals with the exception of a few strong acids and alkalis.