Acetal Technical Data and Information
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It offers a high modulus of elasticity combined with great strength, stiffness and resistance to abrasion. Moisture has little or no effect on acetal, and because of this, the dimensional stability of close tolerance fabricated items is excellent. It is suitable for mechanical parts or electrical insulators that require structural strength at above normal temperatures.
Properties:
High modulus of elasticity. High strength and stiffness.
Low coefficient of friction. Easily fabricated with hand
tools and automatic production machinery. Good abrasion
and impact resistance. Low moisture absorption. Excellent
machine ability. Natural lubricant. Resistant to petrol,
solvents, and other neutral chemicals. Useful in air
temperatures of -50°C to +150°C.
Applications:
Acetals overall combination of physical, tribological
and environmental properties make it ideal for many
industrial wear and mechanical applications. Pump and
valve components. Gears, Bearings, Bushings, Rollers,
Fittings, Electrical insulator parts.
ASTM test |
Property |
Value |
Mechanical |
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| D792 | Specific gravity | 1.42 |
| D638 | Tensile strength, Ultimate | 10,000 psi. |
| D 638 | Elongation at break | 75% |
| D 638 | Tensile modulus | 4.5x10~5 p.s.i. |
| D 785 | Rockwell hardness | R120,M94 |
| D 256 | Impact strength (23° C) | 2.3 ft-lb/inch |
| D 790 | Flexural strength | 14,300 psi. |
| D 790 | Flexural modulus | 3.8x 10~5 psi. |
| Coefficient of friction 40psi 50fpm | 0.20 Dynamic | |
Thermal |
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| Melting point | 175° C | |
| D 648 | Heat deflection at 66 psi | 170° C |
| D 648 | Heat deflection at 264 psi | 136° C |
| Max service temp for short term | 150° C | |
| Max service temp for long term | 85° C | |
| C 177 | Thermal conductivity | 2.60 Btu-inch/hr-ft~2- ° F |
| Specific heat | 0.35 Btu/lb- ° F | |
| D 696 | Coefficient of linear thermal expansion | 6.8x10~5 |
| Temp range for thermal expansion | 85-140° F | |
Electrical |
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| D 150 | Dielectric constant at 60Hz (23° C) | 3.7 |
| D 150 | Dissipation factor at 60Hz (23° C) | 0.005 |
| D 257 | Volume resistivity | 10~15 ohm-cm |
| D 149 | Dielectric strength | 500 v/MIL |
Miscellaneous |
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| D 570 | Water absorption - 24 hours | 0.25% |
| D 570 | Water absorption - saturation | 0.90% |
| D 792 | Density | 0.0513 lb/inch~3 |
| UL 94 | Flammability | HB |
| Weathering Resistance | Limited |
These values are representative of those obtained under standard ASTM conditions and should not be used to design parts which function under different conditions.
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