Some principles of general plastic material attention

Some principles of general plastic material attention
Plastic raw materials according to the molecular structure of synthetic resin mainly divided into thermoplastic and thermosetting plastics: for thermoplastic plastic refers to the repeated heating still has the plasticity of plastic: mainly PE/PP/PVC/PS/ABS/PMMA/POM/PC/PA as raw materials. The thermoset plastic mainly refers to a combination of heating and hardening the resin of plastic, like some phenolic and amino plastic plastic.
The main ingredients of plastic raw materials are resin. 2: plastic raw material is made of polymer synthetic resin (polymer) as the main ingredients penetrate various auxiliary materials or additives, in particular temperature, has the plasticity and fluidity under pressure, can be molded into shape and maintain the same shape of material under certain conditions. The plastic raw materials, is made from some oil the most familiar part of PC material is extracted from the oil, the PC material has a gasoline burning time; ABS is made from coal, ABS will show when soot like burn out; POM is produced from natural gas, there will be a POM very smelly smell gas when burned.
A. plastic raw material is heated to expand, the linear expansion coefficient is much larger than the metal;
B. general plastic raw material stiffness than the metal one order of magnitude;
Mechanical properties of C. plastic materials will be significantly decreased in the long time;
D. general plastic raw materials at room temperature and below the yield strength of the long-term stress, will appear permanent deformation;
E. plastic material is very sensitive to the damage of the gap
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