Acetal (polyoxymethylene or POM) is a high strength, low friction, semi-crystalline engineering plastic with excellent wear and abrasion properties in both wet and dry environments. It has low moisture absorption and is chemically resistant to hydrocarbons, solvents, and neutral chemicals. Acetal is easy to machine and an outstanding choice for applications that require complex, tight tolerances. It’s widely used for machinery parts, bearings and bushings, pump and valve parts, and many other applications.
Acetal is available in both homopolymer (Delrin®) and copolymer formulations and a number of other grades. Please ask your Curbell Plastics representative for more information about a specific grade.
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For a glossary of terms, see our Plastic Properties Descriptions.
TYPICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Tensile Strength |
psi |
D638 |
10,000 |
| Flexural Modulus of Elasticity |
psi |
D790 |
420,000 |
| Izod Impact (notched) |
ft-lbs/in of notch |
D256 |
1.5 |
| Heat Deflection Temperature (66psi / 264psi) |
°F |
D648 |
336 257 |
Water Absorption
(Immersion 24 hours) |
% |
D570 |
0.25 |
PHYSICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Specific Gravity |
- |
D792 |
1.42 |
Water Absorption
(Immersion 24 hours) |
% |
D570 |
0.25 |
MECHANICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Tensile Strength |
psi |
D638 |
10,000 |
| Tensile Modulus of Elasticity |
psi |
D638 |
450,000 |
| Tensile Elongation |
% |
D638 |
75 |
| Flexural Strength |
psi |
D790 |
14,300 |
| Flexural Modulus of Elasticity |
psi |
D790 |
420,000 |
| Compressive Strength |
psi |
D695 |
- |
| Hardness |
scale as noted |
D785, D2240 |
M89, R121, Shore D 83 |
| Izod Impact |
ft-lbs/in |
D256 |
1.5 |
THERMAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Coefficient of Linear Thermal Expansion |
in/in/°F x 10-5 |
D696 |
6.8 |
| Heat Deflection Temperature (66psi / 264psi) |
°F |
D648 |
336 257 |
| Max Continuous Service Temperature In Air |
°F |
- |
212 |
ELECTRICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Dielectric Strength |
V/mil |
D149 |
500 |
OPTICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Light Transmittance |
% |
D1003 |
- |
| Haze |
% |
D1003 |
- |
OTHER
| |
UNITS |
ASTM TEST |
|
| Coefficient of Friction |
- |
Dynamic |
0.20 |
Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand.
Still Not Sure if You Need Acetal? Research Acetal or Ask a Plastics Expert.