Polyacetals (POM)
POMs are easy to process thermoplastically and are often used as semi-finished products for machining, as they are dimensionally stable, exhibit good chip breaking and allow high surface qualities. Due to their resilience, POMs are often used for so-called 'snap-fit' connections, i.e. elements that snap into a matching counterpart.
Main features
- Good mechanical properties
- High resilience
- Heat resistant up to 100°C
Due to their universal properties, POMs are generally used unreinforced. Nevertheless, various modifications are available, especially for tribological applications there are types optimised with solid lubricants.
POM co-polymers
POM-C has established itself as the standard due to its good processability. In contrast to POM-H, the material is more resistant to hydrolysis, thermal oxidative degradation and chemical alkalis. Overall, POM-C tends to be less microporous than POM-H in large cross-sections.
| Type | DIN designation | Description of the | Data sheet | FDA |
| Acetron® C | POM-C | Standard type | ||
| Acetron® C-TF | POM-C TF20 | with PTFE powder | - | |
| Acetron® C-GF | POM-C GF25 | glass fibre reinforced | - | |
| Acetron® MD | POM-C | Magnetically detectable | ||
| Acetron® AST | POM-C | antistatic | - | |
| Semitron® ESD 225 | POM-C | electrostatically dissipative | - |
POM Homo polymers
POM-H is usually made from the original raw material Delrin®. In contrast to POM-C, the material has slightly better mechanical properties. In addition, the coefficient of thermal expansion is slightly lower and the wear resistance higher than that of POM-C.
Components made of natural-coloured Acetron® C and Acetron® MD can also be supplied with a food contact safety certificate in accordance with Regulation (EC) 1935/2004.