Materials

Acetal (POM)

Acetal polymers are semi-crystalline. They offer excellent inherent lubricity, fatigue resistance, and chemical resistance. Acetals suffer from outgassing problems at elevated temperatures, and are brittle at low temperatures. Glass filled and added lubrication grades are available; flame retardant grades are not.

CelconDelrin

Typical Properties

Tensile Strength8,000-18,000 psi
Flexural Modulus375,000-450,000 psi
Impact Strength.8-2 ft-lb/in notched izod
Max Temperature180°-300° F
Chemical ResistanceExcellent

Applications

  • Mechanical automotive components
  • Business machine and household appliance parts
  • Slides
  • Gears
  • Cams
  • Bushings
  • Door handles
  • Seat belt parts

Advantages

  • + High tensile strength with rigidity and toughness
  • + Good impact and solvent resistance
  • + Glossy molded surface
  • + Low static and dynamic coefficients of friction (slippery)
  • + Many grades have FDA and NSF approvals on food and water contact
  • + Replace die-cast metal components

Disadvantages

  • − Difficult to bond
  • − Poor resistance to acids and bases
  • − Subject to UV degradation
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