Rigid Thermoplastic Polyurethane (RTPU, PUR-RT)
RTPU is an otherwise-unclassified thermoplastic material. The graph bars on the material properties cards below compare RTPU to: otherwise unclassified thermoplastics (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.
Thermal Properties
Maximum Temperature: Autoignition
270 °C 520 °F
Maximum Temperature: Decomposition
320 °C 600 °F
Specific Heat Capacity
1760 J/kg-K 0.42 BTU/lb-°F
Thermal Conductivity
0.6 W/m-K 0.35 BTU/h-ft-°F
Thermal Expansion
100 µm/m-K
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 Hz
3.6
Dielectric Strength (Breakdown Potential)
24 kV/mm 0.94 V/mil
Electrical Resistivity Order of Magnitude
14 10x Ω-m
Other Material Properties
Density
1.1 g/cm3 66 lb/ft3
Elastic (Young's, Tensile) Modulus
4.0 GPa 0.58 x 106 psi
Elongation at Break
5.0 %
Tensile Strength: Ultimate (UTS)
75 MPa 11 x 103 psi
Common Calculations
Stiffness to Weight: Axial
2.1 points
Stiffness to Weight: Bending
50 points
Strength to Weight: Axial
20 points
Strength to Weight: Bending
38 points
Thermal Diffusivity
0.32 mm2/s
Thermal Shock Resistance
13 points
Followup Questions
Further Reading
Polyurethanes: Science, Technology, Markets, and Trends, Mark F. Sonnenschein, 2015
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