Korea Kepital POM FM2020 High Hardness and High Temperature Resistance Polyoxymethylene Resin

Scope of application Edit broadcast It is suitable for making wear-resistant parts, transmission parts, chemical and instrument
parts. It has the characteristics of rigidity and high wear resistance. It is mainly used for gears, bearings, auto parts, machine
tools, instrument internals and other products that play a skeleton role. Product features editing and broadcasting (1) The POM
can not be dried before processing. It is better to preheat (about 80 ℃) during processing, which is good for the stability of
product size; (2) The processing temperature of POM is very narrow (0~215 ℃), and when it stays in the barrel for a long time or
the temperature exceeds 220 ℃, it will decompose and produce highly irritating formaldehyde gas; (3) When POM material is
injected, the pressure retaining pressure should be larger (close to the injection pressure) to reduce the pressure drop. The
screw speed should not be too high and the residual amount should be less; (4) The POM product has a large shrinkage rate and is
prone to shrinkage or deformation. The POM has a large specific heat and a high mold temperature (80~100 ℃). The product is very
hot when demoulding, so it is necessary to prevent scalding fingers; (5) POM should be formed and processed under the conditions
of "medium pressure, medium speed, low material temperature and high mold temperature". The mold temperature should be controlled
when forming precision products (6) High mechanical strength and rigidity; (7) Maximum fatigue strength; (8) Good environmental
resistance and organic solvent resistance; (9) It has strong resistance to repeated impact, good electrical properties, good
resilience, good self-lubrication, good wear resistance, and excellent dimensional stability. App edit broadcast It can replace
most non-ferrous metals, automobiles, machine tools, instrument internals, bearings, fasteners, gears, spring plates, pipes,
transportation belt accessories, electric water cookers, pump shells, water drains, faucets, etc Physical and chemical editing and
broadcasting General performance Polyoxymethylene is a hard and dense material with smooth and glossy surface. It is light yellow
or white, and the thin-walled part is translucent. The combustion characteristics are easy to burn, and continue to burn after
leaving the fire. The upper end of the flame is yellow, and the lower end is blue. There is melting dripping, and there is strong
irritating formaldehyde smell and fishy smell. POM is a white powder, generally opaque, with good colorability, specific gravity
of 1.41-1.43 g/cm3, molding shrinkage of 1.2-3.0%, molding temperature of 170-200 ℃, drying condition of 80-90 ℃ for 2 hours. The
long-term heat resistance of POM is not high, but it can reach 160 ℃ in the short term. The short-term heat resistance of
homopolymer POM is more than 10 ℃ higher than that of copolymer POM, but the long-term heat resistance of copolymer POM is about
10 ℃ higher than that of homopolymer POM. It can be used for a long time in the temperature range of - 40 ℃~100 ℃. POM is very
easy to decompose at 240 ℃. There are irritating and corrosive gases during decomposition, so the mould steel should be made of
corrosion-resistant materials. (1) POM is 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 small friction coefficient and good self-lubrication (3) POM is not easy to absorb moisture, and
its water absorption is 0.22~0.25%. It has good dimensional stability in wet environment, and its shrinkage is 2.1% (large). It is
difficult to control the size during injection molding, and its thermal deformation temperature is 172 ℃. There are two kinds of
polyformaldehyde, which have different properties (homoformaldehyde has better temperature resistance) mechanical property POM has
high strength and rigidity, good elasticity and good wear resistance. Its mechanical properties are excellent, with specific
strength up to 50.5MPa and specific stiffness up to 2650MPa, which is very close to metal. The mechanical properties of POM change
little with temperature, and the change of copolymer POM is slightly larger than that of homopolymer POM. The impact strength of
POM is high, but the conventional impact is lower than that of ABS and PC; POM is sensitive to notch, and notch can reduce impact
strength by up to 90%. The fatigue strength of POM is very prominent. After 10 alternating loads, the fatigue strength can reach
35MPa