PP non-toxic, tasteless, density is small, the strength, stiffness, are better than that of low pressure polyethylene, hardness and heat resistance can be used at about 100 ℃. It has good dielectric property and high frequency insulation and is not affected by humidity. Suitable for making general mechanical parts, corrosion-resistant parts and insulating parts. Common acid, alkali and other organic solvents have little effect on it.