POM nature 
 POM is a side-chain, high-density, linear polymer of high crystallinity, with excellent overall performance. 
 POM is a surface smooth, shiny, hard and dense material, yellow or white, long-term use in the temperature range of -40 - 100 ° C. Its wear resistance and lubricity superior than most other engineering plastics, there are good oil, peroxide-resistant performance. Very acid, of intolerance alkali and intolerance moonlight ultraviolet radiation. 
 POM of the tensile strength up to 70MPa, water absorption, dimensional stability, glossy, these performance than nylon, POM is a highly crystalline resin in the thermoplastic resin is the toughest. With the thermal strength, flexural strength, fatigue resistance are high strength, abrasion resistance and excellent electrical properties. 


 Performance of POM 


 Performance values 
 Proportion of 1.43 
 Melting point 175 ° C 
 Tensile strength (yield) 70MPa 
 Elongation rate (yield) of 15% 
 (Break) 15% 
 Impact strength (unnotched) 108KJ/m2, 
 (Notched) 7.6KJ/m2 
 Homopolymer of formaldehyde synthesis generally aqueous solution of formaldehyde in the presence of acid condensation polymerization. Degree of polymerization of 100 or more a-POM, and its thermal decomposition to formaldehyde gas, purified monomer after purification, and dehydration, usually part of the pre-polymerization method, and then pass into containing a small amount of the initiator dry solvent polymerization. Because of the presence of water, so that the molecular weight significantly reduced. The initiator can be used such as a Lewis acid or alkali. However, most tertiary amine anion addition polymerization, the reaction is as follows: stable POM-end-hemiacetal (-CH2OH), when the temperature higher than 100 ° C, the end groups easy to break, generally subject to the treatment of end groups of. Stabilization can be treated and heat-resistant to 230 ℃. Paraformaldehyde in 170 ~ 200 ° C temperature processing, such as injection, extrusion, blow molding, etc.. Mainly used for engineering plastics for automobiles, machinery parts, etc. 




 Scope of application of the POM 


 POM has a low coefficient of friction and the geometric stability, particularly suitable for the production of gears and bearings. It also has a high temperature characteristics, it is also used for pipe device (pipe valve, pump housing), lawn equipment, etc.. 
 Injection molding conditions: 
 Dried: If the material is stored in a dry environment, usually do not need to be dried. 
 The melting temperature: homopolymer materials for 190 ~ 230 ℃; copolymers for 190 ~ 210 ℃. 
 Mold temperature: 80 ~ 105 ℃. In order to reduce the molding shrinkage can choose a higher mold temperature. 
 Injection pressure: 700 ~ 1200bar 
 Injection speed: moderate or high injection speed. 
 Runners and Gates: You can use any type of gate. If you are using a tunnel-shaped gate, it is best to use the shorter type. Homopolymer materials recommended using the hot nozzle flow. Copolymers can use within the hot runner can also use external hot runner. 


 Chemical and physical properties of the POM 




 POM is a tough, flexible material, even at low temperatures is still a very good anti-creep properties, geometry, stability and impact resistance. POM both homopolymer materials and copolymer materials. Homopolymer material with an extension strength, fatigue strength, but can not be easily processed. The copolymers have good thermal stability, chemical stability and ease of processing. Both homopolymer material or copolymer materials are crystalline materials and are not easily absorb water. The high degree of crystallinity of the POM cause it has a very high shrinkage, can achieve a high 2% to 3.5%. For a variety of enhanced materials have different shrinkage rates. 


 The main purpose of the POM 


 Polyoxymethylene (pom) is an excellent engineering plastics, in foreign countries have "wins Steel" 

 Super steel, "said pom has a metal-like hardness, strength, and steel in a wide range of temperature and humidity have a good self-lubricity, good fatigue resistance, and resilient, in addition to it good chemical resistance. pom below the cost of many other engineering plastics are replacing traditionally been occupied by the metal market, such as alternative zinc, brass, aluminum and steel production of many components, since its inception. pom has been widely used in electrical and electronic machinery, instruments, daily light industry, automobile, building materials, agriculture and other fields. in many new fields of application such as medical technology, sports equipment, etc., pom also showed good growth . 

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