Performance characteristics of cosmetic plastic bottles and plastic products
Cosmetic plastic bottle, The characteristics of plastic products
Compared with other materials, plastic has 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 the foamed plastics have a lighter texture due to the micropores inside, and the relative density is only 0.01. This feature allows plastics to be used in the production of products that require lightening of their own weight.
2. Excellent chemical stability
Most plastics have good corrosion resistance to chemicals such as acids and alkalis. In particular, polytetrafluoroethylene (F4), commonly known as the plastic king, is more chemically stable than gold, and it will not deteriorate even if it is boiled in "aqua regia" 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.
3. Excellent electrical insulation properties
Ordinary plastics are poor conductors of electricity, and their surface resistance and volume resistance are very large, which can reach 109 to 1018 ohms in numbers. The breakdown voltage is large, and the dielectric loss tangent value is small. Therefore, plastics have a wide range of applications in the electronics industry and machinery industry. Such as plastic insulated control cables.
4. Poor conductor of heat, with 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 are 40% higher than single-glass aluminum windows, and double-glass windows are 50% higher. After the plastic window is combined with the hollow glass, it 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.
5. 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. Due to the small specific gravity and high strength of plastic, it has a high specific strength. Compared with other materials, plastics also have obvious shortcomings, such as flammability, higher stiffness than metals, poor aging resistance, and heat resistance.