The high-performance resin, glass fiber and special production process formula used in SMC materials ensure the penetration of resin in glass fiber, greatly enhance the internal adhesion, and make the product have high fatigue strength. Under the given payload, its service life is usually no less than 30 years. The characteristics of glass fiber endow the product with excellent high and low temperature resistance (the product can be used at - 50 ~ 160 ℃), chemical resistance (acid, alkali, salt, organic solvent, etc.) and dimensional stability (coefficient of thermal expansion: 12 * 10-6 / ℃).