High temperature glass fiber composite sheet is a compositematerial which is made by glass fiber and high mechanical strength resin. Itowns excellent electrical, thermal and chemical properties. It can keep itsmechanical strength, smoothness and original color when continuously used underthe temperature of 280C (max. working temperature below385 degree 10~20sec). In addition, it has the advantages of easily machining,high intensity and can be easily machined into special mechanical parts. Its flexure modulus is 20000psiand it can keep its flexure modulus for 15000 psi when the energy and heat is rising.