Unfilled POM-C
Unfilled POM-C is a grade of POM-C. The graph bars on the material properties cards below compare unfilled POM-C to: polyoxymethylene plastics (top), all thermoplastics (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
2.8 GPa 0.41 x 106 psi
Elongation at Break
65 %
Fatigue Strength
23 MPa 3.3 x 103 psi
Flexural Modulus
2.6 GPa 0.38 x 106 psi
Flexural Strength
83 MPa 12 x 103 psi
Impact Strength: Notched Izod
69 J/m 1.3 ft-lb/in
Rockwell M Hardness
80
Tensile Strength: Ultimate (UTS)
61 MPa 8.8 x 103 psi
Thermal Properties
Heat Deflection Temperature At 1.82 MPa (264 psi)
100 °C 220 °F
Heat Deflection Temperature At 455 kPa (66 psi)
160 °C 320 °F
Maximum Temperature: Mechanical
100 °C 210 °F
Specific Heat Capacity
1370 J/kg-K 0.33 BTU/lb-°F
Thermal Conductivity
0.23 W/m-K 0.13 BTU/h-ft-°F
Thermal Expansion
85 µm/m-K
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 Hz
3.7
Dielectric Constant (Relative Permittivity) At 1 MHz
3.8
Dielectric Strength (Breakdown Potential)
41 kV/mm 1.6 V/mil
Electrical Dissipation At 1 MHz
0.0060
Electrical Resistivity Order of Magnitude
14 10x Ω-m
Otherwise Unclassified Properties
Density
1.4 g/cm3 88 lb/ft3
Limiting Oxygen Index (LOI)
15 %
Water Absorption After 24 Hours
0.21 %
Common Calculations
Stiffness to Weight: Axial
1.1 points
Stiffness to Weight: Bending
33 points
Strength to Weight: Axial
12 points
Strength to Weight: Bending
24 points
Thermal Diffusivity
0.12 mm2/s
Thermal Shock Resistance
18 points
Followup Questions
Further Reading
SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 5th ed., Michael L. Berins (editor), 2000
Modern Plastics Handbook, Charles A. Harper (editor), 1999
Plastics Materials, 7th ed., J. A. Brydson, 1999