HC Plastics Network News: In a variety of plastic, some as hard as a stone, some as tough as steel, and some steel and gold as stable. Some people think that using engineering plastic instead of metal, the quality of the product should be reduced. The fact is that the use of engineering plastics instead of metals has improved the quality of products on many occasions. The following comparison of engineering plastics and metals will enable everyone to have a more accurate and comprehensive understanding of the performance of engineering plastics.
The main advantages of engineering plastics and metals are:
(1) Light product quality: The proportion of engineering plastics is generally about 0.83 to 2.2, only 1/9 to 1/4 of steel, and about 1/2 of aluminum. Some engineering plastics, such as polypropylene, are much lighter than water. This characteristic of plastics is of particular importance for mechanical equipment that requires weight reduction, such as vehicles, ships and airplanes.
(2) High specific strength: For an equal volume of material, the strength of engineering plastics is generally lower than that of metals. However, since engineering plastics are much lighter than metals, when compared with equal weights, there are some engineering plastics. The strength is much higher than that of general metals and is the highest strength material in existing structural materials. For example, glass-fiber-reinforced epoxy resins have a tensile strength per unit weight that is about two times higher than that of ordinary steel.
(3) Good chemical stability: Engineering plastics generally have good corrosion resistance to acids, alkalis and other chemicals. This is a very significant advantage. Among them, PTFE and polychloroether have very outstanding anti-corrosion capabilities, and they have a promising future for use in chemical anti-corrosion equipment.
(4) Excellent electrical performance: Almost all engineering plastics have superior electrical insulation properties, minimal dielectric loss, and excellent arc resistance, comparable to ceramic, rubber, and other insulating materials. Therefore, the application of engineering plastics in motors, electrical appliances and electronics industries has extremely broad prospects.
(5) Antifriction and excellent wear resistance: Using this feature, it is possible to use engineering plastics to manufacture various self-lubricating bearings, gears, and seal rings. Engineering plastics also have good foreign material burial, which is for the presence of harsh particles or impurities
(6) Excellent shock-absorbing and noise-reducing effects: Machines equipped with engineering plastic bearings and gears can reduce vibration, reduce noise, and even achieve noise reduction. For example, the tie rod end of the automobile is originally made of carbon steel No. 45, which has a short service life and high noise. After changing to nylon, not only the service life is extended by about 1 time, but also the noise is greatly reduced.
(7) Convenient for forming and processing: Engineering plastic products can often be formed at one time, and metal products always go through several routes, dozens or even dozens of processes to complete processing. This characteristic of engineering plastics is of great significance for saving man-hours and increasing labor productivity. Plastic machining is also easier.
As engineering plastics have many advantages in terms of physical and mechanical properties, their application in industry is becoming more and more extensive. This in turn also promotes the leap forward of the plastics industry.
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