Performance characteristics of plastic products
Compared with other materials, plastic products have the following performance characteristics:
1. Light weight
Plastic is a lighter material with a relative density of 0.90-2.2. Obviously, can plastic float to the surface? Especially foam plastic, because of the micropores in it, it is lighter in texture and has a relative density of only 0.01. This feature allows plastic For the production of products that need to reduce their own weight.
2. Excellent chemical stability
Most plastics have good corrosion resistance to chemicals such as acids and alkalis, and are chemically more stable than gold. Due to its excellent chemical stability, it is an ideal corrosion-resistant material. For example, Teflon can be used as a material for pipes carrying corrosive and viscous liquids.
3. Excellent electrical insulation properties
Ordinary plastic is a poor conductor of electricity, and its surface resistance and volume resistance are large, and the number can reach 109 to 1018 ohms. The breakdown voltage is large, and the dielectric loss tangent value is small. Therefore, plastics have a wide range of applications in the electronics and machinery industries, such as plastic-insulated control cables.
4. The thermal conductivity is poor, and it has the effect of noise reduction and damping
Generally speaking, the thermal conductivity of plastic products is relatively low, which is equivalent to 1/75-1/225 of steel. Micropores of foamed plastics.
Contains gas and has good heat insulation, sound insulation and shock resistance. For example, the thermal conductivity of PVC is only 1/357 of that of steel and 1/1250 of that of aluminum. In terms of thermal insulation, single-glass plastic windows are 40% higher than single-glass aluminum windows, and double-glass windows are 50% higher. After the plastic window is combined with the insulating glass, it can be used in residences, office buildings, wards, hotels, etc. It can save heating in winter and air-conditioning costs in summer, and the benefits are very obvious.
5. Wide distribution of mechanical strength and high specific strength
Some plastics are hard like stone and steel, and some are soft like paper and leather; from the perspective of mechanical properties such as plastic hardness, tensile strength, elongation, impact strength, etc., the distribution range is wide, and there are many choices for use. Compared with other materials, plastic products also have obvious shortcomings, such as flammability, higher stiffness than metal, poor aging resistance, poor heat resistance, etc.