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 ACETAL Acetal is a highly crystalline form of polymerred formaldehyde. Standard shapes are produced from copolymer (Celcon) or homopolymer (Delrin) resins. Acetal has strength, stiffness and toughness. It is characterized by a low co-efficient of friction and good bearing characteristics. Physical properties remain constant in a variety of environments since it absorbs only minimum amounts of moisture. Under conditions of high moisture, acetal bearings can out perform nylon by 4 to 1. However, under conditions of average humidity, nylons are superior to acetals in impact strength and abrasion resistance. Dimensional stability of acetal allows for the machining of close tolerance parts. Acetal has good resistance to organic solvents and other chemicals but is attacked by strong acids and bases. It has relatively high melting point and can be used in continuos exposure to temperatures of 82°C and in intermittent exposure to 93°C. It has high dielectric strength so can be used in many electrical applications. Most acetals are FDA compliant for applications involving contact with food.
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