Polypropylene is a thermoplastic resin obtained by polymerizing propylene. There are three configurations of isotactic, random and syndiotactic, and industrial products are mainly composed of isotactics. Polypropylene also includes copolymers of propylene and a small amount of ethylene.Usually a translucent, colorless solid, odorless and non-toxic. Due to the regular structure and high crystallization, the melting point is as high as 167 ° C, heat resistance, steam sterilization of products can be its outstanding advantages.Density 0.90g/cm3, the lightest general purpose plastic.Corrosion resistance, tensile strength 30MPa, strength, rigidity and transparency are better than polyethylene.The disadvantage is that it is resistant to low temperature impact and is easy to age, but can be overcome by modifying and adding antioxidants respectively.
Non-toxic, odorless, low density, strength, stiffness, hardness and heat resistance are better than low-pressure polyethylene, can be used at about 100 degrees. Has good electrical properties and high-frequency insulation is not affected by humidity,However, it becomes brittle at low temperature, is not wear-resistant, and is easy to age. It is suitable for making general mechanical parts, corrosion-resistant parts and insulating parts.Common acid and alkali organic solvents have little effect on it and can be used in food utensils.