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.