Polyoxymethylene (POM / Acetal)

Polyoxymethylene (POM), also known as acetal or polyacetal and polyformaldehyde is an engineering thermoplastic used in precision parts requiring high stiffness, low friction and excellent dimensional stability. As with many other synthetic polymers, it is produced by different chemical firms with slightly different formulas and sold variously by such names as Delrin, Celcon, Ramtal, Duracon, Kepital and Hostaform.

Typical applications for injection-molded POM include high performance engineering components such as small gear wheels, ball bearings, ski bindings, fasteners, knife handles, and lock systems. The material is widely used in the automotive and consumer electronics industry.


General Properties :
Chemical Properties
Minimum value Maximum value Unit Sources
Solidification shrinkage 1.8 3.2 % Idemat 2003
Water absorption 0.25 0.25 % Idemat 2003
Electrical Properties
Minimum value Maximum value Unit Sources
Solidification shrinkage 1.8 3.2 % Idemat 2003
Water absorption 0.25 0.25 % Idemat 2003
Mechanical Properties
Minimum value Maximum value Unit Sources
Bending strength 50 80 MPa Idemat 2003
Compressive strength 31 31 MPa Idemat 2003
Creep strength - - MPa -
Density 1410 1420 kg/mÂ3 Idemat 2003
Elongation 25 25 % Idemat 2003
Fatigue failure - - MPa -
Friction coefficient 0.2 0.35 - Idemat 2003
Impact strength 0.53 1.2 J/cm Idemat 2003
Shear modulus 900 930 MPa Idemat 2003
Tensile strength 69 72 MPa Idemat 2003
Thickness - - MPa -
Thickness - - MPa -
Young’s modulus 2900 3500 MPa Idemat 2003
Optical Properties
Minimum value Maximum value Unit Sources
Refractive index 1.48 1.48 - Idemat 2003
Thermal Properties
Minimum value Maximum value Unit Sources
Glass temperature - - °C -
Melting temperature 175 175 °C Idemat 2003
Service temperature -60 110 °C Idemat 2003
Specific heat 1465 1465 J/kg.K Idemat 2003
Thermal conductivity 0.23 0.37 W/m.K Idemat 2003
Thermal expansion 81 104 e-6/K Idemat 2003

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