Polyoxymethylene or POM is a crystalline polymer. This is one of the stiffest and most resistant thermoplastic materials and shows an excellent dimensional stability.
Both the homopolymers and copolymers are weakened by strong acids (pH 4) and oxidizing agents. Neither are soluble and hardly swell in all types of current organic solvents, as wells as fuels and mineral oils.
Some types of POM are physiologically harmless and intended to come into contact with food products.
The special stabilised types are resistant to diesel fuels and to aggressive petrol up to a temperature of 100 °C.
On the contrary, non-stabilised formulations are weakened by UV rays.
- It brittles at temperatures lower than -40 °C
- It stands temperatures up to almost 150 °C for short-term applications
- It stands temperatures up to almost 110 °C for long-term applications
- High surface hardness and a low friction coefficient
- An excellent sliding behaviour and wear-resistance
- Good insulation values
- Low gas and vapour tightness, also of organic compounds
SOME FIELDS OF APPLICATION
- They are used to substitute high precision metallic parts for the technical applications (for ex: gearings, levers, bearings, screws, coils, parts for textile machines, pipe fittings, components for hot water pumps or fuels)
- POM-PUR mixtures are used to produce manufactures con with a high shock resistance, such as chain pinions, casing components, zippers, ski bindings and integral hinges.