Acetal provides high strength and stiffness coupled with enhanced dimensional stability and ease of machining. As a semi-crystalline material, acetal is also characterized by a low coefficient of friction and good wear properties –– especially in wet environments. Because acetal absorbs minimal amounts of moisture, its physical properties remain constant in a variety of environments. Low moisture absorption results in excellent dimensional stability for close tolerance machined parts. In high moisture or submerged applications, acetal bearings outperform nylon 4 to 1.
Acetal is ideally suited for close tolerance mechanical parts and electrical insulators which require strength and stiffness. It also offers resistance to a wide range of chemicals, including many solvents. Homopolymer acetal is most commonly recognized as Delrin, resins that are currently made by the DuPont Company under the trade name Delrin® AF. Homopolymers have slightly higher mechanical and thermal properties than Copolymers. Homopolymer, Unfilled Delrin® natural and black are FDA, USDA, NSF, Canada AG and 3A-Dairy compliant.
Some advantages of homopolymer acetal (Delrin®) over copolymer acetal are:
- Greater stiffness, with higher flexural modulus at room and elevated temperature applications
- Slightly higher tensile and impact strength at room temperatures
- Slightly harder, thus giving the homopolymer acetals a lower coefficient of friction
- Continuous use temperature of 185 °F
- Excellent dimensional stability
- High Strength and stiffness
- Low moisture absorption
- Excellent creep resistance
- Good sliding properties
- Outstanding electrical properties
Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative by filling out the form below.
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Sustarin H Homopolymer Sell Sheet