50 Years of Designing and Manufacturing Engineered Plastic Parts for Industrial Equipment


Timco machines both homopolymer (Delrin®) and copolymer grades of acetal into parts. Acetal is a highly crystalline thermoplastic with high mechanical strength and rigidity as well as good sliding properties, wear resistance and low moisture absorption. Its dimensional stability and particularly good fatigue resistance as well as exceptional machinability make acetal a versatile engineering material for complex components and parts with high demands on surface quality.

Acetal parts can perform to 180°F and provide consistent physical properties in wet environments. Parts can function well even where high levels of humidity or wetness are to be expected.

Key properties of all acetals:

  • Low moisture absorption with excellent dimensional stability
  • Good wear properties in wet environments
  • High strength and stiffness
  • Impact resistance even at low temperatures

Acetal´s stability combined with resistance to a wide range of solvents make acetal a popular choice for food contact and medical components. Typical machined acetal parts include spring components, electrical insulators, bushings, pump components, gear wheels, casing components, cam disks, valves and valve bodies, cams and ratchets, counter components, sliding components and general precision components.

Both natural and black, homopolymer and copolymer materials are FDA compliant.

Acetal Copolymer (POM)

Acetal copolymer offers consistent properties throughout the shape – no centerline porosity. It has superior chemical and hot water resistance, is more resistant to strong alkalies and thermal-oxidative degradation, and provides lower outgassing than homopolymer acetal. It also provides better impact, wear, thermal and chemical resistance than homopolymer acetal.

Acetal Homopolymer (POM)

Acetal homopolymer offers higher crystallinity than copolymer acetal. It is slightly denser, harder and stronger. Homopolymer also has improved mechanical strength, stiffness, creep resistance and a lower thermal expansion rate than copolymer acetal. Homopolymer acetal is most commonly known by the E.I. DuPont tradename Delrin®.

Delrin® is a registered trademark of E.I. DuPont.
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