Plastic screw

Description

1. Density: PP is less dense than all synthetic resins, only 0.90-0.91g/cm3, which is about 60% of the density of PVC. This means that more products of the same volume can be produced from the same weight of raw materials.

2. Mechanical properties: PP has good tensile strength and rigidity, but poor impact strength, especially at low temperature. In addition, if there is orientation or stress in the forming process, the impact strength will also be significantly reduced. Although the impact strength is poor, its mechanical properties can compete with engineering plastics with higher cost in many fields after modification such as filling or strengthening.

3. Surface hardness: The surface hardness of PP is lower than that of PE in five kinds of general plastics. When the crystallinity is high, the hardness increases correspondingly, but it is still lower than PVC, PS, ABS and so on.

4. Thermal properties: Among the five general plastics, PP has better heat resistance. PP plastic products can work for a long time at 100 C, without external force, PP products will not deform when heated to 150 C. After using nucleating agent to improve the crystalline state of PP, the heat resistance of PP can be further improved. It can even be used to make utensils for heating food in microwave oven.