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POM moulding: technical acetal components

We injection-mould technical POM components to customer drawings: a stiff, low-friction engineering polymer for moving parts such as gears, bushings and clips.

What is POM?

Polyoxymethylene (POM), also called acetal, is a semi-crystalline engineering polymer also known by trade names such as Delrin®.

It combines stiffness, hardness and a low coefficient of friction: parts slide well even without lubrication and resist wear and fatigue. It absorbs very little moisture and holds tolerances, which makes it suitable for precision components. It resists solvents, fuels and oils, but not strong acids.

Properties of POM

  • High stiffness and hardness
  • Low coefficient of friction
  • Excellent fatigue resistance

Indicative continuous service temperatures for the most common grades: the exact value depends on the grade and formulation and should be checked on the data sheet of the chosen material.

What is POM used for?

  • Gears and toothed wheels
  • Bushings and plain bearings
  • Clips, hooks and snap fits
  • Slides and sliding pads
  • Components for adjustment mechanisms

How we mould POM

POM is injection-moulded with a hot mould and controlled cooling. Its shrinkage is high, and the mould design has to compensate for it to achieve the required tolerances.

POM or another material?

The material is chosen according to the conditions of use of the component. The closest alternatives:

  • PA 6 / PA 66 Polyamide

    Polyamide handles impact better and, glass-fibre reinforced, high temperatures; POM absorbs less moisture and holds tolerances better.

  • PP Polypropylene

    Polypropylene costs less and resists chemicals, but it is less stiff and wears faster in moving parts.

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Do you have a component to make in POM?

Send us your drawing or a sample: the contact form opens with the material already selected. If the material is still open, we will choose it together.

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