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Compression molding is considered as the main method for making many structural car body parts, including wheels, fiberglass bumpers, fiberglass manhole cover and plate-spring. The entire process of pressure forming is accomplished by converting the sheet plastic into the FRP finish in the mold. It can generate complex geometric shapes in a short time. Mold forming can eliminate some secondary finishing operations such as drilling, forming and welding. And the whole process can be automated.

There are five advantages of compression molding. Good finish on both sides. Faster fiber glass production. Uniform fiberglass reinforced plastic products quality. Less labor content. Very little finishing operations are required. There are also two glass reinforced plastic disadvantages of pressure forming. On the one hand, due to the high cost of molds and printing presses, this process is not suitable for low yield. On the other hand, this process also does not apply to very large FRP grp composite products.