PP为结晶型高聚物，常用塑料中PP最轻，密度仅为0.91g/cm3（比水小）。通用塑料中，PP的耐热性最好，其热变形温度为80-100℃，还有一种就是pe塑料、pe热塑性大，手摸有蜡感，密度在0．92～0．96克／厘米3之间。它耐腐蚀，绝缘性能好。这几种塑料都是用途最广最常见的塑料。

PP is a crystalline polymer. In common plastics, PP is the lightest, and the density is only 0.91g/cm3 (smaller than water). In general plastics, the heat resistance of PP is the best, the thermal deformation temperature is 80-100 degrees, and one is PE plastic, PE is thermoplastic, and the hand feels wax. The density is between 0.92 ~ 0.96 g / cm 3. It is resistant to corrosion and has good insulation. These kinds of plastics are the most widely used and most common plastics.