The excellent properties of plastic in plastic bags make it widely used in industrial and agricultural production and people’s daily life. In the past, it has been used as a substitute for metal, glass, ceramics, wood, fiber, and other materials, and has become an indispensable material for modern life and cutting-edge industries. So, what are the excellent properties of plastics? 1.Light weight, high specific strength. Plastic is light in weight, and the density of ordinary plastic is0.9arrive2.3g/3cmBetween, while the density of various foams is low, about0.01arriveO.5g/3cmbetween. The strength per unit mass is called specific strength, and the specific strength of some reinforced plastics is close to or even higher than that of steel. For example, alloy steel has a tensile strength per unit mass of160MPa, while glass fiber reinforced plastics can achieve170-400MPa. 2.Excellent electrical insulation properties. Almost all plastics have excellent electrical insulating properties, such as extremely small dielectric loss and excellent arc resistance, which are comparable to ceramics. 3.Excellent chemical stability. Generally speaking, plastics have good corrosion resistance to chemicals such as acids and alkalis, especially polytetrafluoroethylene has better chemical resistance than gold, and can even withstand the corrosion of strong corrosive electrolytes such as aqua regia , so it is called the king of plastics. 4.Good friction reduction and wear resistance. Most plastics have excellent anti-friction, wear-resistant and self-lubricating properties. Many anti-friction parts made of engineering plastics take advantage of these properties of plastics. When some solid lubricants and fillers are added to wear-resistant plastics, their friction number can be reduced, or their wear resistance can be further improved. 5.Light transmission and protection properties. Most plastics are available as clear or translucent products, with polystyrene and acrylic plastics being as clear as glass. The chemical name of plexiglass is polymethyl methacrylate, which can be used as aviation glass material. Plastic films such as polyvinyl chloride, polyethylene, and polypropylene have good light transmission and heat insulation properties, and are widely used as agricultural films. Plastic has many protective properties, so it is often used as protective equipment, such as plastic wrap, boxes, barrels, bottles, etc. 6.Excellent vibration and sound attenuation properties. Some plastics are flexible and elastic. When they are subjected to frequent mechanical shocks and vibrations from the outside, they generate viscous internal friction and convert mechanical energy into thermal energy. Therefore, they are used in engineering as shock-absorbing and sound-absorbing materials. For example, bearings and teeth made of engineering plastics can reduce noise, and various foam plastics are widely used as excellent shock absorption and sound attenuation materials.
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