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Acetal - Materials - Technical Information - Hobby and Engineering
Acetal
MBA Products made from this material
Balls, Bearings, Bushes, Gears, Rod, Sheet
Also known as POM. Acetal is a widely used rigid engineering plastic. It is highly resistant to fatigue and cracking and resistant to many solvents. It has a low coefficient of friction and remains stable in reasonably high temperatures, making it an excellent choice for bushes and bearings.
Properties of Acetal
| PROPERTY | UNIT | ACETAL | TEST METHOD | ACETRON | TEST METHOD |
| Specific Gravity | g/cm3 | 1.41 | 1.44 | ||
| Tensile Strength | N/mm2 | 65 | DIN53479 | 55 | D638 |
| Elongation (break) | % | >30 | DIN53455 | 20-30 | D638 (71oC) |
| Modulus of Elasticity | N/mm2 | 3000 | DIN53457 | 2450 | D638 (23oC) |
| Impact Strength | KJ/m2 | no break | DIN53453 | 63-84 | D1822 (23oC) |
| Coefficient of friction | 0.32 | 0.19 | |||
| Dielectric Strength | Kv/mm | 55 | DIN53481 | 12.8 | D149 |
| Melting Point | oC | 165 | 171 | ||
| Water Absorption | % | 0.25 | 20oC/60RH | 0.14-0.21 | D570 (24hr) |
| OperatingTemperature Intermittent |
oC | 140 | 120 | ||
| OperatingTemperature Continuous |
oC | -40 to + 100 | -40 to + 82 | ||
| Flammability | Slow Burning | UL | Slow Burning | UL |
Note! Property values are typical and should be used only as a guide to selection of materials and not as purchase specifications.
Comparison: Wear Rate, Coefficient of Friction and Limiting PV data
PV factor is used to express limiting conditions for the operation of plain bearings. P=load (psi). V=surface velocity (fpm).
K factor is a wear factor in.3-min/ft-lb-h
| Wear Factor "K" |
Comparative Wear Rate to Acetron NS | Coefficient
of friction
|
Limiting PV | ||||
| Acetron NS | 23 | 1.0 | 0.13-0.19 | 0.15-0.19 | 10,000 | ||
| DELRIN® Acetal Resin AF |
65 | 2.8 | 0.13-0.14 | 0.15-0.16 | 11,500 | ||
| DELRIN® Acetal Resin 500 CL |
176 | 7.6 | 0.12-0.14 | 0.20-0.21 | 3,500 | ||
| Acetal | 216 | 9.3 | 0.12-0.28 | 0.15-0.35 | 2,500 | ||
| Turcite | 251 | 10.9 | 0.13-0.17 | 0.17-0.18 | 6,500 | ||
DELRIN®is a registered trademark of DuPont.
Acetron NS is a patented acetal-based compound containing special solid lubricants which help provide superior performance in bearing applications. Acetron NS provides high Pressure Velocity (PV) capabilities, a low coefficient of friction and an extremely good "k" factor.
You can purchase online at Hobby & Engineering Supplies.
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Tables and information on this web site should be read as a general guide only. The relevant standards should be consulted to ensure accuracy
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Using the links at the top of this page you will find extensive information including catalogues (Products and Store link), technical data, and other product specific information.
We also suggest that you may want to take a look at the technical information sites - Shafting Information, Couplings Information and Gearboxes Information.
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