The characteristics of Plastics: 1.plastic has plasticity, plasticity is the so-called plastic, can make the solid plastic softened by heating method, and then the soft plastic in the mold, solid let it cool after the re solidified into a certain shape. The properties of plastics are also has certain defects, namely heat easily softening deformation, some plastics and even with a high temperature water will deformation, so the plastic products are generally not contact with boiling water or high temperature object.

2.plastic with elastic, some plastic like synthetic fiber, has certain elasticity. When it is subjected to external force Lasheng, coiled molecular because straightened with the flexibility and, once the tension after the cancellation, it will restore the original state of the curl, which makes plastic with elastic, such as polyethylene and polyvinyl chloride film products. But some plastic is not flexible.

3.plastic not only has high strength, plastic although no metal as hard, but compared with the glass, ceramics, wood, or persuade strength and wear resistance of high. Per unit mass calculation of strength is called the strength of reinforced plastics, some close to or even more than the steel strength, such as tensile strength of alloy steel unit mass is 160MPa, and the use of glass fiber reinforced plastic can reach 170-400MPa. It can be made of plastics machine rugged gear and bearing parts.

4.plastic has corrosion resistance, plastic neither that metallic rusts in the moist air, nor as that of wood in a humid environment will rot or microbial corrosion, plastic has excellent chemical stability. Corrosion resistance of general plastic well to acid and alkali chemicals have, especially Corrosion resistance of PVC "aqua" and other corrosive electrolyte, known as the "king of plastic". Therefore, the plastic is often used in a water pipeline, chemical factory building doors and windows.

5.plastic insulation, almost all of the plastic has good electrical insulating properties, molecular chain of plastic is atoms covalently binding up, neither nor molecular ionization, electron transfer in the structure, so the plastic insulation. Therefore, the plastic used in the manufacture of a wire, socket, electrical appliances shell etc..

Secondly, plastics and many other excellent properties such as abrasion resistance, transparency and shock absorption, noise elimination. But plastics also have some shortcomings, such as heat resistance than the metal material, the use of the general plastic temperature below 100 degrees, a few can be used at 200 degrees; coefficient of thermal expansion to 3-10 times larger than the metal, easily affected by temperature changes affect the dimensional stability; under load, plastic will slowly yielding viscous flow or deformation, the creep phenomenon. These shortcomings plastic more or less affect its application. With the development of plastic industry and plastic materials research, these shortcomings are being gradually overcome, excellent performance of new plastics and plastic composite materials are constantly emerging.