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Acetal - Shaft / Shafting Information
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For information on where you can buy shafting please see the Sourcing page or the links further down this page.
Acetal is one of a number of engineering plastics which can be supplied in rod form. Sometimes these are referred to as plastic shafting. Acetal rod is usually supplied much larger than the nominal size. For example, a 50mm diameter rod can be up to 51mm diameter or more. Engineering plastics are not meant to be used with precision ground bearings, but can be turned to fairly accurate tolerances for use as shafting in less critical applications. As always, you should consult with an engineer in any crital applications. Acetal is 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. Useful information about acetal and other engineering plastics is available in the links below and to the right of this page. Where to purchase shaftingSmall Parts and BearingsEngineering plastics for small industrial and hobby applications. Shipping daily to USA, England, Asia and most worldwide destinations. www.smallparts.com.au Miniature Bearings Australia Wholesale engineering plastics for small industrial and hobby applications. www.minibearings.com.au H.E. Supplies (Hobby Engineering) Hobby and engineering plastics for all types of small dynamic hobbies including remote control cars, boats, planes, helicopters and other models. www.hobbyparts.com.au |
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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.
More information on acetal
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Site Summary:
Shafting.com.au is your one stop resource for all types of information on shafting. The pages are administered by Miniature Bearings Australia and provide technical and sourcing information for all types of shafting from precision ground to semi-precision rod. Materials discussed include plastics, aluminium, chrome steel, various grades of stainless steel, silver steel and titanium.
This site is not a point of sale. It is designed to provide information only and to hopefully point you in the right direction with your shafting enquiries. This may include links to Miniature Bearings Australia or it's distributors, and it may also include links to competitors sites.
User input is encouraged and forms are provided throughout the site to enable users to make corrections or provide additional data.
Online purchases of many types of shafting can be made through the Small Parts and Bearings online store which is linked directly to the Miniature Bearings Australia online catalogue. We also suggest that you may want to take a look at Couplings Information, Gearboxes Information and H.E. Supplies Hobby Parts.
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