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Unfilled POM-H

Unfilled POM-H is a grade of POM-H. The graph bars on the material properties cards below compare unfilled POM-H 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

3.4 GPa 0.49 x 106 psi

Elongation at Break

55 %

Fatigue Strength

29 MPa 4.3 x 103 psi

Flexural Modulus

2.9 GPa 0.42 x 106 psi

Flexural Strength

94 MPa 14 x 103 psi

Impact Strength: Notched Izod

75 J/m 1.4 ft-lb/in

Rockwell M Hardness

94

Tensile Strength: Ultimate (UTS)

67 MPa 9.7 x 103 psi

Thermal Properties

Glass Transition Temperature

-23 °C -8.5 °F

Heat Deflection Temperature At 1.82 MPa (264 psi)

130 °C 270 °F

Heat Deflection Temperature At 455 kPa (66 psi)

160 °C 320 °F

Maximum Temperature: Autoignition

350 °C 650 °F

Maximum Temperature: Decomposition

330 °C 620 °F

Maximum Temperature: Mechanical

90 °C 190 °F

Melting Onset (Solidus)

180 °C 360 °F

Specific Heat Capacity

1460 J/kg-K 0.35 BTU/lb-°F

Thermal Conductivity

0.33 W/m-K 0.19 BTU/h-ft-°F

Thermal Expansion

120 µm/m-K

Vicat Softening Temperature

170 °C 330 °F

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

3.7

Dielectric Strength (Breakdown Potential)

58 kV/mm 2.3 V/mil

Electrical Dissipation At 1 MHz

0.0050

Electrical Resistivity Order of Magnitude

13 10x Ω-m

Otherwise Unclassified Properties

Density

1.4 g/cm3 89 lb/ft3

Limiting Oxygen Index (LOI)

15 %

Water Absorption After 24 Hours

0.25 %

Common Calculations

Stiffness to Weight: Axial

1.3 points

Stiffness to Weight: Bending

35 points

Strength to Weight: Axial

13 points

Strength to Weight: Bending

26 points

Thermal Diffusivity

0.16 mm2/s

Thermal Shock Resistance

12 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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015