RTPU vs. Thermoset PI

RTPU belongs to the thermoplastics classification, while thermoset PI belongs to the thermoset plastics. There are 13 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is RTPU and the bottom bar is thermoset PI.

Rigid Thermoplastic Polyurethane (RTPU, PUR-RT)Thermoset Polyimide (PI)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		5.0
Elongation at Break, %		2.0 to 5.9

Tensile Strength: Ultimate (UTS), MPa		75
Tensile Strength: Ultimate (UTS), MPa		37 to 81

Thermal Properties

Maximum Temperature: Autoignition, °C		270
Maximum Temperature: Autoignition, °C		380

Maximum Temperature: Decomposition, °C		320
Maximum Temperature: Decomposition, °C		330

Specific Heat Capacity, J/kg-K		1760
Specific Heat Capacity, J/kg-K		1130

Thermal Conductivity, W/m-K		0.6
Thermal Conductivity, W/m-K		0.29 to 1.7

Thermal Expansion, µm/m-K		100
Thermal Expansion, µm/m-K		38 to 54

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm		24
Dielectric Strength (Breakdown Potential), kV/mm		20

Electrical Resistivity Order of Magnitude, 10^x Ω-m		14
Electrical Resistivity Order of Magnitude, 10^x Ω-m		15

Otherwise Unclassified Properties

Density, g/cm³		1.1
Density, g/cm³		1.4 to 1.6

Common Calculations

Strength to Weight: Axial, points		20
Strength to Weight: Axial, points		6.5 to 16

Strength to Weight: Bending, points		38
Strength to Weight: Bending, points		16 to 30

Thermal Diffusivity, mm²/s		0.32
Thermal Diffusivity, mm²/s		0.18 to 0.95