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Basic properties of plastics
Aug 02, 2017

1. Light weight, high intensity. Plastic light, the general density of plastic in 0.9 ~ 2.3 grams/cm 3, only steel 1/8~1/4, aluminum around 1/2, and the density of various styrofoam is lower, about 0.01~ o. 5 grams/cm 3. The strength calculated by unit mass is called the specific strength, and some of the reinforced plastics are closer to or above the steel than the strength. For example, Alloy steel, the tensile strength of its unit mass is 160 MPA, while glass fiber reinforced plastic can reach 170~ 400 MPa.

2. Excellent electrical insulation performance. Almost all plastics have excellent electrical insulation properties, such as minimal dielectric loss and excellent arc resistance, which can be comparable to ceramics.

3. Good chemical stability. General Plastics to acid-base and other chemical products have good corrosion resistance, especially the chemical resistance of PTFE is better than gold, and even the ability to "aqua Regia" and other strong corrosive electrolyte corrosion, known as "Plastic King."

4. Antifriction and abrasion resistance. Most plastics have excellent antifriction, abrasion and self-lubricating properties. Many of the friction-resistant parts made by engineering Plastics use these properties of plastics, which can reduce the friction number or further improve their wear resistance when some solid lubricant and filler are added to wear resistant plastics.

5. Transmission and protection. Most plastics can be used as transparent or translucent products, where polystyrene and acrylic ester plastics are as transparent as glass. PMMA chemical name is poly methyl methacrylate, can be used as aviation glass material. PVC, polyethylene, polypropylene and other plastic films have good transmission and thermal properties, a large number of agricultural films. Plastic has a variety of protective properties, it is often used as protective equipment, such as plastic film, boxes, barrels, bottles and so on.

6. Damping, sound attenuation performance. Some plastics are flexible and flexible, and when it is subjected to frequent mechanical shocks and vibrations, internal friction is generated, and mechanical energy is converted into heat energy, so engineering is used as damping material. For example, the use of engineering plastics to produce bearings and teeth can reduce noise, all kinds of foam is a widely used excellent damping material.

The excellent properties of the plastic make it widely used in industrial and agricultural production and in People's daily life; it has been used as a substitute for materials such as metals, glass, ceramics, wood and fibres, and has become an indispensable material for modern life and cutting-edge industries.

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