Thermoset PI vs. RTPU

Thermoset PI belongs to the thermoset plastics classification, while RTPU belongs to the thermoplastics. 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 thermoset PI and the bottom bar is RTPU.

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

Metric UnitsUS Customary Units

Mechanical Properties

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

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

Thermal Properties

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

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

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

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

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

Electrical Properties

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

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

Otherwise Unclassified Properties

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

Common Calculations

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

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

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