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Properties Profile

POM - Polyoxymethylene (acetal)
  Select unit system:
PropertyValue
   Dimensional stability
Coefficient of linear thermal expansion10 - 15 10^-5 °C-1
H2O absorption 24 hours0.15 - 0.5 %
Shrinkage1.8 - 2.5 %
   Electrical performances
Arc resistance200 - 220 sec
Dielectric constant3.3 - 4.7 
Dielectric rigidity13.8 - 20 kv/mm
Dissipation factor50 - 110 10^-4
Volume resistivity14 - 15 10^X Ohm.cm
   Fire performances
Fire resistance (LOI)18 %
Flammability UL94HB
   Mechanical properties
Elongation at break15 - 75 %
Elongation at yield8 - 23 %
Flexibility (Flexural Modulus)2.8 - 3.7 GPa
Hardness Rockwell M75 - 94 
Hardness Shore D80 - 95 
Stiffness (Flexural Modulus)2.8 - 3.7 GPa
Strength at break (tensile)60 - 70 MPa
Strength at yield (tensile)54 - 78 MPa
Toughness (Notched Izod impact at room temperature)60 - 120 J/m
Toughness at low T (Notched Izod impact at low temperature)53 - 250 J/m
Young modulus2.8 - 3.7 GPa
   Physical properties
Density1.41 - 1.42 g/cm^3
Glass transition temperature-60 - -50 °C
   Radiation resistance
Gamma radiation resistanceFair
UV light resistancePoor
   Service temperature
Ductile/fragile temperature-40 °C
HDT @0.46 Mpa (67 psi)158 - 172 °C
HDT @1.8 Mpa (261 psi)110 - 136 °C
Max continuous Service temperature80 - 105 °C
Min continuous service temperature-40 °C
   Others
Sterilization resistance (Repeated)Poor
Thermal insulation (Thermal conductivity)0.31 - 0.37 W/m.K
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