Acetal (polyoxymethylene)

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Overview
Performance Characteristics
Typical Applications
Typical Properties
Overview
ACETAL is a high strength, low friction engineering plastic that has excellent wear properties in both wet and dry environments.

Good dimensional stability and ease of machining make acetal an outstanding choice for applications requiring complex machining to tight tolerances.

Homopolymer and Copolymer Acetal


  • Homopolymer acetal (Delrin®) has superior room temperature strength, stiffness, and toughness.
  • Copolymer acetal has superior performance in continuous high heat and hot water environments. Copolymer acetal also tends to have less porosity than homopolymer acetal.

Glass Filled and Enhanced Grade Acetal


  • Acetal is available in glass-filled grades that offer enhanced strength and stiffness.
  • Acetal is also available in a number of enhanced bearing and wear grades including Delrin® AF, Delrin® AF blend, and TECAFORM™ HPV 13.

Acetal Standard Sizes

SHEET 24"x48" (0.25"-6.0" thick)
48"x96" (0.125"-2.0" thick)
48"x120" (0.125"-2.0" thick)
ROD diameter 0.25"-12.0"
TUBE OD 1.0"-4.0"

  • Length, width, and thickness tolerances may vary by manufacturer
  • Certain grades available in various colors.
  • Minimums may apply to certain materials

Acetal Grades and Colors

  • Grades include:
    • Homopolymer acetal
    • Copolymer acetal
    • FDA compliant
    • Enhanced bearing and wear
    • Glass-filled
  • Colors include:
    • Natural (white)
    • Black
    • Colors

NOTE: Several grades of acetal are available. For additional information on acetal plastic materials, contact your local Curbell Plastics representative or call Curbell at 1-888-287-2355.
Performance Characteristics
  • Strong and stiff
  • Excellent machinability
  • Good dimensional stability
  • Low moisture absorption
  • Excellent wear properties in both wet and dry environments
  • Low friction
  • Good chemical resistance
Typical Applications
  • Bearings and bushings
  • Pump and valve parts
  • Manifolds
  • Gears
  • Jigs and fixtures
  • Packaging machinery parts
  • Food processing machinery parts
  • Electrical components
Typical Properties
UNITS ASTM TEST HOMOPOLYMER ACETAL COPOLYMER ACETAL TECAFORM™ HPV 13
PFTE-FILLED
ACETAL
20% GLASS FIBER FILLED HOMOPOLYMER ACETAL
Tensile strength psi D-638 10,000 9,800 6,800 8,500
Flexural modulus psi D-790 420,000 370,000 350,000 730,000
Izod impact (notched) ft-lbs/in of notch D-256 1.5 1.0 0.7 0.8
Heat deflection temperature @ 264 psi °F D-648 257 230 244 316
Maximum continuous service temperature
in air
°F 185 195 185 185
Water absorption (immersion
24 hours)
% D-570 0.25 0.20 0.22 0.25
Coefficient of linear thermal expansion in/in/°Fx10-5 D-696 6.8 6.1 5.1 2.0-4.5
Coefficient of friction (dynamic) 0.20 0.21 0.12 0.35
Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand.

LONG TERM EFFECTS OF BOILING WATER
on the tensile strengths of Homopolymer Acetal and Copolymer Acetal
NEED MORE INFORMATION?
Contact Curbell Plastics at 1-888-287-2355 for more specific information about acetal plastic or complete our request for quote online form.