Performance characteristics of plastic products
Compared with other materials, plastics have the following performance characteristics:
1. Light weight
Plastic is a lighter material with a relative density distribution between 0.90 and 2.2. It is obvious that the plastic can float to the surface of the water, especially the foamed plastic, because there are micro holes, the texture is lighter, and the relative density is only 0.01. This property allows plastics to be used in the production of products requiring reduced self weight.
2. Excellent chemical stability
The vast majority of plastics have good corrosion resistance to acids, alkalis and other chemicals. In particular, commonly known as the plastic king of polytetrafluoroethylene (F4), its chemical stability is even better than gold, in the "king's water" boiled for more than ten hours will not deteriorate. Due to its excellent chemical stability, F4 is an ideal corrosion resistant material. Such as F4 can be used as a material for transporting corrosive and viscous liquid pipelines.
3. Excellent electrical insulation properties
Ordinary plastics are bad conductors of electricity, and their surface resistance and volume resistance are very large, which can reach 109 to 1018 ohms by digital expression. The breakdown voltage is large and the dielectric loss Angle tangent value is small. Therefore, plastics have a wide range of applications in the electronics industry and the machinery industry. Such as plastic insulated control cable.
4. A bad conductor of heat, with muffling and damping effects
In general, the thermal conductivity of plastics is relatively low, equivalent to 1/75-1/225 of steel, and the micropores of foam plastics.
Contains gas, its heat insulation, sound insulation, shock resistance is better. For example, the thermal conductivity of polyvinyl chloride (PVC) is only 1/357 of steel and 1/1250 of aluminum. In terms of heat insulation capacity, the single glass plastic window is 40% higher than the single glass aluminum window, and the double glass is 50% higher. After combining plastic forms with insulating glass, it is used in residential buildings, office buildings, wards and hotels, saving heating in winter and air conditioning expenses in summer, and the benefits are very obvious.
5. Wide distribution of mechanical strength and high specific strength
Some plastics are as hard as stone and steel, while others are as soft as paper and leather. From the mechanical properties of plastic hardness, tensile strength, elongation and impact strength, the distribution range is wide, and there is a great choice of use. Due to the small proportion of plastic, high strength, so it has a high specific strength. Compared with other materials, plastics also have obvious shortcomings, such as easy to burn, stiffness is not as high as metal, poor aging resistance, heat resistance and so on.