POM Plastic Material Data Sheet

Technical Data Sheet Acetal (POM) (polyoxymethylene) Acetal is a very high strength, low friction engineered plastic exhibiting excellent wear Resistance in both wet and dry environments. With good dimensional stability these materials provide ease of machining, making Acetal an outstanding choice for applications requiring complex machining and tight tolerances. Homopolymer Acetal (Delrin®) has superior ambient temperature strength, stiffness, and toughness. Copolymer Acetal has superior performance in continuous high heat and hot water environments. Copolymer Acetal also tends to have less porosity than Homopolymer Acetal. Grades of Acetal ACETAL COPOLYMER (unfilled) The copolymer grade offers excellent performance at a slightly lower cost than Delrin®. Certain grades are FDA, USDA, NSF, Canada AG and 3-A Dairy compliant. Low stress levels and high strength assure flatness and dimensional stability up to a maximum continuous service temperature of 180°F. DELRIN® Homopolymer (unfilled) Acetal homopolymer offers slightly higher mechanical properties than acetal copolymer, but may contain a low density center (also known as “center line porosity”) especially in large cross-sections. The homopolymer also gives slightly less chemical resistance than copolymer acetal. For example, Delrin® is ideal for small diameter, thin-walled bushings that benefit from the additional strength and rigidity of homopolymer acetal. Delrin® is available in natural and black. DELRIN® AF (PTFE-filled) This material is manufactured from Delrin® homopolymer resin which has been uniformly filled with a dispersion of PTFE fibers. Delrin®AF is a unique thermoplastic material for use in moving parts in which low friction and long wear life are important. It retains 90% of the mechanical strength of unfilled acetal homopolymer, while offering very low friction.