Plastic tables and chairs compared with other materials […]
Plastic tables and chairs compared with other materials, tables and chairs, the following aspects of performance characteristics:
1. Light weight
Plastic is a lighter material with a relative density distribution between 0.90 and 2.2. Obviously, plastic can not float to the surface? Especially foam plastic, due to the microporous, lighter texture, the relative density of only 0.01. This feature allows plastics to be used in products that require weight reduction.
2. Excellent chemical stability
The vast majority of plastic on acid, alkali and other chemicals have good corrosion resistance. Especially known as the plastic king of PTFE (F4), its chemical stability even better than gold, on the "aqua regia" cooking ten hours will not be spoiled. Because F4 has excellent chemical stability, it is the ideal corrosion-resistant material. Such as F4 can be used as a corrosive and viscous liquid pipe material.
3. Excellent electrical insulation
Ordinary plastic is poor conductor of electricity, the surface resistance, volume resistance is large, with figures that up to 109 a 1018 ohms. Breakdown voltage, dielectric loss tangent is very small. Therefore, plastic in the electronics industry and machinery industry has a wide range of applications. Such as plastic insulated control cable.
4. Bad heat conductor, with a muffler, shock absorption
In general, the thermal conductivity of plastic is relatively low, equivalent to 1 / 75-1 / 225 of steel, the pores of the foam.
Contains gas, which insulation, noise, shock better. Such as PVC (PVC) thermal conductivity of only 1/357 steel, aluminum 1/1250. In the insulation capacity, single glass window than the single-glazed aluminum window 40% higher, double glass 50%. The combination of plastic form and insulating glass, used in residential, office buildings, wards, hotels, the winter to save heating, summer air-conditioning savings, the benefits are obvious.
5. Widely distributed mechanical strength and high specific strength
Some plastic hard as stone, steel, and some soft as paper, leather; from the plastic hardness, tensile strength, elongation and impact strength and other mechanical properties of view, a wide range of distribution, there is a great choice of use. Due to the small proportion of plastic, high strength, which has a higher specific strength. Compared with other materials, plastic also has obvious shortcomings, such as easy to burn, the stiffness is not as high as metal, poor aging resistance, heat resistance and so on.