Acetal Copolymer (POM-C)
Polyoxymethylene, commonly called Acetal, is a crystalline polymer obtained from the polymerisation of formaldehyde. Discovered fairly recently (1960), it has enjoyed rapid growth and large acceptance thanks to it’s excellent mechanical features, stability to humidity and ease of machining. Better resistance to hydrolysis and strong alkalis then POM-H. Approved for use in contact with food & potable water. Temperature range is -50°C to +100°C.
High fatigue resistance
Good dimensional stability
Low friction coefficient
Compressive strength, shock resistance, even at low temperature
Colours: sheets in natural & black, rods in natural, black and some diam. in red and blue.
Compared to PA6 it has a lower abrasion resistance, particularly in dirty and dusty environments.
Mechanical: it is one of the most commonly used engineering plastics for mechanical applications such as bearings, cams, gears with low torque, gear wheels, conveyor rollers and precision machined components requiring dimensional stability and tight tolerances.
Food contact: being physiologically inert it is suitable for food contact. It can be used in water at 80° C.
Electrical: as it is not hygroscopic, it is commonly used for electric components such as insulators.
Chemical: it is resistant to alkali and organic compounds. Thanks to its good chemical properties it is suitable for pump components, flanges and components for chemical plants.
PV VALUE OF A BEARING
The graph compares the PV value of a bearing
in function of the speed: materials POM c. - PE 1000.
On ordinate : shaft speed m/min.
On abscissa: PV value