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Polyacetal - Pom (Polyoxymethylene)

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Polyacetal - POM (PolyOxyMethylene) is a high crystalline thermoplastic with a high level of stability and rigidity as well as good sliding properties and wear resistance with a low level of moisture absorption. Its good dimensional stability, exceptional fatigue resistance and excellent machining properties make Polyacetal a versatile design material also for complex components. It satisfies high surface finish requirements and offer better surface hardness, toughness and excellent solvent and gasoline resistance.
A High Degree of crystallinity makes acetals stiffer and stronger than most thermoplastics, yet they are tough at ambient and low temperature, good dimensional stability is a key property.
Acetals absorb little water, minimizing its effect on their physical properties.
There are two basic types of acetal resins; Homo-polymer and Copolymer.
The homo-polymers’ strength properties tend to be slightly higher than those of the copolymers. Delrin is a homo-polymer Polyacetal. Delrin has higher (short term) heat deflection temperatures than copolymers, but their continuous use temperature is 85°C (185°F) compared to 100°C (212°F) for copolymers. The homo-polymers tend to have somewhat greater surface hardness, higher degree of density and a slightly lower coefficient of friction.
The copolymers, compared to homo-polymers, tend to absorb less water, are more resistant to hydrolysis and have superior processing characteristics. Copolymers, however, have higher impact toughness, greater wear resistance and thermal / chemical resistance.
Acetals are mostly used in applications where excellent surface finish & accuracy with good dimensional stability are required. These are also preferred as a good material for food & pharmaceutical, chemical & oil industries.

Main properties
  • High stability
  • High rigidity
  • High hardness
  • Good impact resistance, also at low temperatures
  • Low level of moisture absorption (at saturation 0.8 %)
  • Good creep resistance
  • High dimensional stability
  • Physiologically safe

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