Characteristics of plastic raw materials

For you to analyze the characteristics of plastic raw materials

1 plastic raw materials, thermal expansion, thermal expansion coefficient is much larger than metal;

2 the rigidity of the general plastic material is one order of magnitude lower than that of the metal;

3 the mechanical properties of plastic raw materials will decrease obviously under long time heating;

4 general plastic raw materials at room temperature and below the yield strength of the long-term stress, there will be permanent deformation;

5 plastic materials are sensitive to notch damage;

6 the mechanical properties of plastic raw materials are usually much lower than those of metals, but the specific strength and specific modulus of some composites are higher than those of metals. If the product is designed reasonably, it will be more advantageous;

7 generally enhance the mechanical properties of plastic raw materials are the opposite sex;

8 some of the plastic materials are hygroscopic and cause changes in size and performance;

9 some plastics are flammable;

10 plastic raw material fatigue data is still very few, according to the need to consider.