POM (homo): Polyoxymethylene (homopolymer)

Short Name
POM (homo)
Polyoxymethylene (homopolymer)
ETP - Engineering Thermoplastics
General Properties
Chemical Formula
Structural Formula


Glass Transition Temperature
-85 to -75 °C
Melting Temperature
175 to 190 °C
Melting Enthalpy
316 to 335 J/g
Decomposition Temperature
365 to 390 °C
Young's Modulus
2600 to 3200 MPa
Coefficient of Linear Thermal Expansion
160 to 180 *10¯6/K
Specific Heat Capacity
1.48 to 1.50 J/(g*K)
Thermal Conductivity
0.30 to 0.37 W/(m*K)
1.39 to 1.43 g/cm³
Semi-crystalline polymer
General properties
Good stiffness, toughness and strength. Low humidity absorption. Good resistance to creeping and fatigue. High recovery capability. Good sliding properties. Food-compatible
Injection molding, extrusion, blow molding
Automobile industry. Instrument and apparatus engineering. Electrical/electronics industry. Food industry. Household goods

Internet Links

NETZSCH Measurements

DSC 204 F1 Phoenix®
Sample Mass
10.88 mg
Isothermal Phase
7 min
Heating/Colling Rates
10 K/min
Al, pierced
N2 (40 ml/min)


The high degree of crystallinity of POM-H is reflected in the above DSC curve. It is dominated by a distinctive melting effect at 183°C (1st heating, blue, peak temperature) and 181°C (2nd heating, green, also peak temperature) as well as a quite small glass transition step at -77°C (midpoint). The height of the glass transition step Δcp is a measure for the amorphous content in the material while the melting enthalpy (here 195 J/g in the 2nd heating) is related to the crystalline content (in this case 62%); the larger the melting enthalpy, the larger the crystalline content.
For semi-crystalline polymers, the magnitude of the glass transition and the height of the melting enthalpy are inversely proportional (i.e., if the heat of fusion increases, the glass transition step gets smaller and vice versa).

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