Color – White
POM is a semi-finished material, made of polyacetal, one of the most important an engineering thermoplastic with good physical characteristics, low water absorption and good chemical resistance.
POM can be used in mineral oils, fire-resistant water based hydraulic fluids (HFA, HFB, HFC fluids). It is not resistant to acids and basis.
POM has a high ability to maintain the size, resilience and low moisture absorption. Very good characteristics in friction and sliding.
Friction coefficient (during sliding) = 0,25-0,32 ( without lubrication against still 16 Mp p=0,05 N/mm², v=0,6 m/s/5h).
Critical pv values (p – power, v – speed)
- v=0,05 m/s p=0,032 N m/mm2 *s
- v=0,5 m/s p=0,039 N m/mm2 *s
- v=5 m/s p=0,039 N m/mm2*s
Temperature range is from -50°С up to +100°С (for short period up to +130°С).
Pom has a good electrical properties, high chemical resistance and tensile strength. Material has a very low moisture absorption.
Application
POM can be used for production of anti-extrusion rings, guide rings, wipers and for rings that are produced on the machines with tight tolerances. POM is mainly use in cases where high hardness and low friction coefficient are required, for guide and back-up rings, applied at temperature not higher than +100°С. When using POM for a long period of time at high load (back-up rings, tensioning element) the temperature should be not higher than +80°С.
Resistance
Good resistance | Average resistance | Low resistance |
|---|---|---|
Mineral oils and lubricants | Ketones | Concentrated acids and basis |
Vegetable oils and adiposes | – | Oxidants |
Fuel | – | – |
Alcohols | – | – |
Water | – | – |
Dilute acid and alkali | – | – |
Aliphatic and aromatic hydrocarbones | – | – |
Mainly used
- Guide rings
- Back-up rings
- Special seal parts
- Special wipers
- Valves/valve seat
- Constructional parts
- Bearing shells and sleeves.
POM Material Data Sheet
Properties | Value | Unit | Standard |
|---|---|---|---|
Hardness at 20°: | 85 | Shore D | DIN 53505 |
Density: | 1,41 | g/cm³ | DIN 53479 |
Tensile strength: | >70 | N/mm2 | EN ISO 527-2 |
Elongation at break: | >35 | % | EN ISO 527-2 |
Modulus of elasticity: | 3000 | N/mm2 | EN ISO 527-2 |
Charpy impact strength: | > 140 | kJ/m2 | EN ISO 179 |
Compr. strength at 1% deform.: | 100 | N/mm2 | ASTM D695 |
Coefficient of friction (dyn.): | <0.25 | μ | ASTM D1894 |
Water absorbtion to saturation: | < 0.8 | % | EN ISO 62 |
Water absorbtion in 23h: | < 0.2 | % | EN ISO 62 |
Dieelectric strength: | 20 | kV/mm | EN IEC 60243 |
Volume resistivity: | > 1014 | Ω*cm | EN IEC 60093 |
Surface resistivity: | > 1013 | Ω | EN IEC 60093 |
Coefficient of therm. expansion: | 120 | 1/K*106 | |
Min. service temperature: | – 60 | °C | |
Max. service temperature (short term): | + 100 (+140) | °C |
All above established data results from random tests which were taken from the functioning production. All data was stated based on standard test-products in accordance with ISO, DIN and ASTM standards and can substantially not be extended to the completed seal. Our practical technical recommendation, either oral, written or through tests is given in conformity with our best knowledge. However, this data is to be regarded as non-obligatory advice, also taking into consideration any protective rights of a third party, and does not acquit you from making tests with our product in relation to its adaptability for the assigned process and intendment. Utilization, application and processing of the products befall completely outside of our control and are therefore solely your liability. As regards the responsibility, it will be limited to all damages in the value of the product which we delivered and you applied. Certainly, we do assure the immaculate quality of our products in concordance with our general sales and delivery conditions.