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POM - What does the Plasticprop sample tell you about the material?

The Plasticprop sample represents a POM-C copolymer type and leads to the following conclusions:

  • Grip the sample tightly – you will notice how slippery it is compared with any other sample in the kit. POM makes for good bearing material.
  • When comparing the POM sample with glass-reinforced samples in particular, you can see that it is smaller. The shrinkage of POM is substantial.
  • Considerable corner effect and the slight distortion characteristic of semi-crystalline plastics can be noticed. The sink marks caused by ribs are also clearly distinguishable.
  • The filling window is almost completely filled; POM is more fluid than most other plastic materials. The fluidity also depends on the product grade used.
  • If you stress the sample’s creep indicator for several hours, you will see that POM also suffers from creep, even though it is known for its excellent creep resistance.
  • The sample surface is relatively clean, but ‘splashes’ typical for POM can be noticed around the injection point.
  • The surface of POM feels greasy. Printing on POM is difficult – test this by carefully scraping the stamp on the upper edge.
  • Scratches, especially on the rougher spark-eroded surface side, accompany smaller draft angles. This is somewhat surprising, because you would expect POM to shrink apart from the scratching mould surface. Fair draft is recommended.
  • The integral hinge fills up and even functions for a short time before breaking off. For example, as an element facilitating assembly, the hinge could still function.
  • If you freeze the sample overnight, its feeling hardly changes. The properties of POM are maintained well.

 

Read more about the sample kit here.