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Color - black

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 85 Sh D ISO 868
Specific gravity 1,4 g/cm³ ISO 1183
Ball indentation hardness 145 MPa ISO 2039-1 H358/30
Tensile stress at yield 65 MPa ISO 527-2
Elongation at yield 9,4 % ISO 527-2
Elongation at break 27 % ISO 527-2
Coefficient of linear thermal expansion 11 10-5/K DIN 53752
Min. service temperature (glass transition temperature) -40 °C  
Max. service temperature (High Heat Resistance) +110 °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.

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