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The main performance characteristics of plastic products

Update:17 Aug 2020
Summary:

Plastic products are the general term for daily necessi […]

Plastic products are the general term for daily necessities and industrial products processed with plastic as the main raw material. Including all products made of plastic injection molding and blister molding. .The following introduces the main performance characteristics of plastic products:

 

Light weight
Plastic is a lighter material with a relative density of 0.90-2.2. Obviously, can plastic float on the water? Especially foamed plastic, because it has micropores in it, the texture is lighter, and the relative density is only 0.01. This characteristic allows plastics to be used in the production of products that require a reduction in their own weight.

 

Excellent chemical stability
Most plastics have good corrosion resistance to chemicals such as acids and alkalis. Especially polytetrafluoroethylene (F4) commonly known as the king of plastics, its chemical stability is even better than that of gold. "It will not deteriorate even if it is cooked for more than ten hours. Because F4 has excellent chemical stability, it is an ideal corrosion-resistant material. For example, F4 can be used as a material for conveying corrosive and viscous liquid pipelines.

Excellent electrical insulation properties
Ordinary plastics are poor conductors of electricity, and their surface resistance and volume resistance are very large, and they can reach 109 to 1018 ohms in numbers. The breakdown voltage is large, and the dielectric loss tangent value is small. Therefore, plastics are used in the electronics industry and machinery industry. It has a wide range of applications, such as plastic insulated control cables.

 

Poor thermal conductors have muffling and damping effects
Generally speaking, the thermal conductivity of plastic is relatively low, equivalent to 1/75-1/225 of steel, and the micropores of foam plastic

 

It contains gas, which has better heat insulation, sound insulation and shock resistance. For example, the thermal conductivity of polyvinyl chloride (PVC) is only 1/357 of steel and 1/1250 of aluminum. In terms of thermal insulation capacity, single glass plastic windows It is 40% higher than single-glass aluminum windows and 50% higher than double-glass windows. After combining plastic windows with insulating glass, they can be used in residences, office buildings, wards, and hotels, saving heating in winter and saving air-conditioning expenses in summer, and the benefits are very obvious.

Wide distribution of mechanical strength and high specific strength
Some plastics are as hard as stone and steel, and some are soft as paper and leather. From the perspective of the mechanical properties of plastics such as hardness, tensile strength, elongation, and impact strength, they have a wide distribution range and have a lot of room for choice. Plastic has a small specific gravity and high strength, so it has a higher specific strength. Compared with other materials, plastics also have obvious shortcomings, such as being easy to burn, not as rigid as metals, poor aging resistance, and not heat resistant.