POM

POM represents the most crystalline structure of all polymers.

Why choose?

  • Excellent bearing properties
  • POM has good fatigue and creep-resistance. POM is usually selected as the material for plastic springs, although any prolonged tension of the spring can not be recommended.
  • Retains its properties well in temperatures significantly below zero.
  • Excellent chemical resistance

Why not choose?

  • High shrinkage easily leads to warpage and dimension inaccuracy.
  • Due to small friction co-efficient, POM can be slippery to touch which can be a problem if you intend to use it for a handle.
  • Wear resistance is limited, although it is commonly mentioned as a strength of the material.
  • The surface appearance of POM components is typically oily.
  • POM is flammable; fire-retardant grades are difficult to find.

Typical applications:

  • Petrol tank lid in a car
  • Backpack snap harnesses
  • Plastic zippers
  • Pulley wheels
  • Gears

POM is available as a homopolymer and copolymer. The difference between the two is small. It is explained in this article by Hardie Polymers

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