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Acetal - Materials - Technical


BSO Products made from this material
Balls, Bearings, Bushes, Gears, Rod, Sheet

Also known as polyoxymethylene (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

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)
oC 140   120  
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

Factor "K"
Comparative Wear Rate to Acetron NS Coefficient of friction
Static Dynamic
Limiting PV
Acetron NS 23 1.0 0.13-0.19 0.15-0.19 10,000
DELRIN® Acetal Resin
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 find acetal in the Bearing Shop Online Acetal Online Catalogue pages.

The Small Parts and Bearings has a much larger range of engineering supplies.

Hobby and Engineering Supplies lists a smaller range of products and only the most popular items in each range. They also list many additional hobby specific categories.

For the best range of miniature and small bearings please try the Miniature Bearings Australia website. Miniature Bearings Australia also list a large variety of miniature engineering products.

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