POM engineering plastic (polyoxymethylene engineering plastic) are engineering plastic with excellent comprehensive properties. They are the third most common plastic and are called "metal in plastic". They are also known as "plastic steel" and "super steel".

POM engineering plastic have excellent wear resistance, self-lubrication, and relatively high strength (exceeding aluminum, zinc and other metals). Therefore, they have developed rapidly in recent years. Polyoxymethylene engineering plastic can replace non-ferrous metals to manufacture certain parts in motors, radios, machinery, automobiles, atomic energy, aerospace, etc. It is also resistant to organic solvents, has good water resistance, is easy to heat seal, and can be used as a material for oil pipelines. It also has a certain rebound ability, so it can be used to manufacture plastic springs, shock absorbers and other parts.

Performance

(1) POM is a crystalline plastic with a density of 1.42g/cm3. It has good rigidity and is commonly known as "saigang". (2) It has excellent properties such as fatigue resistance, creep resistance, wear resistance, heat resistance, and impact resistance, and has a small friction coefficient and good self-lubricating property.

(3) POM is not easy to absorb moisture, with a water absorption rate of 0.22-0.25%. It has good dimensional stability in a humid environment, and its shrinkage rate is 2.1% (large). It is difficult to control the size during injection molding. The heat deformation temperature is 172¡ãC. There are two types of polyoxymethylene: homopolyoxymethylene and homopolyoxymethylene, with different properties (homopolyoxymethylene has better temperature resistance).

Application

It can replace most non-ferrous metals, automobiles, machine tools, instrument internals, bearings, fasteners, gears, spring sheets, pipes, conveyor belt accessories, electric kettles, pump housings, drainers, faucets, etc.

Features

(1) POM does not need to be dried before processing. It is best to preheat it during processing (about 800¡ãC), which is good for the stability of product size.

(2) The processing temperature of POM is very narrow (0-215¡æ). If it stays in the barrel for a long time or the temperature exceeds 220¡æ, it will decompose and produce highly irritating formaldehyde gas.

(3) When injecting POM material, the holding pressure should be relatively large (similar to the injection pressure) to reduce the pressure drop. The screw speed should not be too high and the residual should be small;

(4) POM products have a large shrinkage rate and are prone to shrinkage or deformation. POM has a large specific heat and a high mold temperature (800-100¡ãC). The product is very hot when demolding and you need to prevent burning your fingers.

(5) POM is suitable for molding under the conditions of "medium pressure, medium speed, low material temperature, and high mold temperature". When molding precision products, you need to control the mold temperature.

(6) High mechanical strength and rigidity

(7) Highest fatigue strength

(8) Good environmental resistance and resistance to organic solvents

(9) Strong resistance to repeated impact, good electrical properties, good recovery, self-lubrication, good wear resistance, and excellent dimensional stability.

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