Dotmar offers both homopolymer and copolymer grades of Acetal Rod, Sheet and Tube. Ertacetal®C (Acetron® GP) is porosity-free and offered as our standard general-purpose grade. For slightly higher mechanical properties, we offer as a non-standard, homopolymer Ertacetal® H (Acetal) (Delrin®) products.

  • Ertacetal H (Delrin), homopolymer acetal rod, sheet and tube offer slightly higher mechanical properties than Ertacetal C Acetal, but may contain a low density centre, especially in larger cross-sections. Ertacetal C (Copolymer) also offers better chemical resistance than momopolymer acetal. Ertacetal H is suitable for small diameter, thin-walled bushings that benefit from the additional strength and rigidity of homopolymer acetal.
  • It is the preferred acetal for food contact and medical applications. Ertacetal, (Dotmar's trade name for acetal rod, acetal sheet and acetal tube) is a semi-crystalline material with high strength, a low coefficient of friction and good wear properties especially in wet environments (resistance to hydrolysis).

Acetal's great machinability together with its dimensional stability, mechanical strength, zero moisture absorption and good load-bearing properties make it ideal for close-tolerance parts.

Key Benefits:

  • High hardness and stiffness
  • Very high mechanical properties
  • Excellent creep resistance and dimensional stability
  • Excellent dielectrical properties
  • Low co-efficient of friction


  • Precision gears
  • Bearings with close tolerances
  • Electrical engineering insulators
  • Compact bearing assembly
  • Snap fit assemblies
  • Parts which operate in water between 60 to 90°C