DuPont POM Delrin 525GR NC000 25%GF Engineering Plastics Heat Resistant and High Rigidity Pom Granules

Scope of application 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 (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