PA12: Polyamide 12

Short Name
Polyamide 12
ETP - Engineering Thermoplastics
General Properties
Chemical Formula
Structural Formula


Glass Transition Temperature
40 to 50 °C
Melting Temperature
170 to 180 °C
Melting Enthalpy
95 J/g
Decomposition Temperature
465 to 475 °C
Young's Modulus
1400 MPa
Coefficient of Linear Thermal Expansion
120 to 140 *10¯6/K
Specific Heat Capacity
1.17 to 1.26 J/(g*K)
Thermal Conductivity
0.22 to 0.24 W/(m*K)
1.01 to 1.04 g/cm³
Semi-crystalline thermoplastic
General properties
High impact strength. Good chemical resistance. Very good stress cracking resistance. Good sliding-friction behavior
Mechanical and apparatus engineering (e.g., bearing and drive elements in humid environments requiring high stability). Automotive engineering. Electrical engineering. Packaging. Medical engineering

Internet Links

NETZSCH Measurements

DSC 204 F1 Phoenix®
Sample Mass
11.55 mg
Isothermal Phase
3 min
Heating/Colling Rates
10 K/min
Al, pierced
N2 (50 ml/min)


In this measurement, evaporation of water occurred at 94°C (peak temperature 1st heating, blue). The shift in the position of the glass transition in the 2nd heating (green, (Tg of 43°C – midpoint with a Δcp value of 0.11 J/(g·K)) after water evaporation was smaller than that on page 95. The cooling rate selected in the experiment (in this case 10 K/min) was lower than the cooling rates polymer granulates generally experience during production. Therefore, the amorphous content of the sample was lower in the 2nd heating. This thesis is confirmed by the relatively high step height (Δcp) of the glass transition in the 1st heating (blue) as well as the exothermal post-crystallization (peak temperature: 159°C, crystallization enthalpy: 2.2 J/g) that occurred immediately prior to melting.
The endothermal melting effect at 178°C (peak temperature, 2nd heating) exhibited a melting enthalpy of approx. 34 J/g.

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