The function of the bumper is to absorb and relax the external impact force and protect the front and rear parts of the car. For this reason, the anti deformation ability of the GRP is weaker than that of the steel, so its ability to absorb shocks is also weak.
At present the domestic automobile bumper is generally used (modified) toughened polypropylene (PP) material as raw material injection molding polypropylene (propylene) - Poly (commonly known as PP plastic material), has a high melting point (up to 167 DEG C), heat density (0.90g/cm3), is a kind of general plastic in the light, there is the high corrosion resistance (tensile strength 30MPa), strength, rigidity and the transparency of its products are relatively well characterized, disadvantages are poor low temperature resistance (by impact PP copolymer, Styrene Elastomer and polyolefin rubber modified materials, 3 kinds of blend composition with high rigidity, impact resistance, scratch and coating, injection molding bumper after loading, 8 km/h impact fragmentation, and has restored flexibility, performance and cost is decreased almost PU, 10%~20%).
There are other bumper materials (such as glass fiber, carbon fiber and other materials), because of its poor environmental performance (Recyclable) or higher cost factors, are not changed into PP materials (both bumper plasticity and rigidity, light weight and thin, low cost has been made the primary goal of bumper), and PP, the size of the ordinary stability and low temperature resistance is poor, the future production of automotive bumper materials but also with modified PP materials and the maturing of thermoplastic elastomer (TPO) as the leading production.
Glass fiber reinforced plastic products manufacturers remind you: Please click on [FRP bumper] to see more "FRP bumper and steel bumper which good" information