Acetal Polyoxymethylene-POM-Polyacetal

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Acetal resins provide a well-balanced set of properties including a hard self-lubricated surface and
excellent chemical resistance, strength, stiffness, andtoughness over a broad temperature range.
The acetal homopolymer was fi rst introduced in1956 as a semi-crystalline form of polymerized
formaldehyde forming a linear chain of molecules of oxymethylene. In the homopolymerization process,
formaldehyde is separated from water and purifi ed to CH 2 O gas, which is then polymerized to
the polyoxymethylene molecule.
The outstanding characteristics of this polymer include stiffness, which permits the design of parts
with large areas and thin cross sections; high tensile strength and creep resistance under a wide range of
temperatures and humidity conditions; high fatigue resistance and resilience for applications requiring
springiness and toughness. Acetal has achieved importance in applications because of a good balance
of properties. Two types of acetals are available: one is a homopolymer resin with higher mechanical
properties, higher end-use temperatures, and higher melt fl ow index, and the other is a copolymer resinwith better processing characteristics and impact resistance.
Application: automotive parts (door handles, window winders, tank fi ller necks and caps, carburetor, screw caps for cooling system expansion tanks, fuel pumps), bearings, cams,clips, containers, home electronics and hardware, parts of textile machines, phones (dialing units and slider guideways),pneumatic components, pump impellers,