PMP vs. Thermoset PI

PMP belongs to the thermoplastics classification, while thermoset PI belongs to the thermoset plastics. There are 14 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

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

Polymethylpentene (PMP)Thermoset Polyimide (PI)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		30
Elongation at Break, %		2.0 to 5.9

Impact Strength: Notched Izod, J/m		130
Impact Strength: Notched Izod, J/m		21 to 43

Tensile Strength: Ultimate (UTS), MPa		24
Tensile Strength: Ultimate (UTS), MPa		37 to 81

Thermal Properties

Glass Transition Temperature, °C		30
Glass Transition Temperature, °C		360

Maximum Temperature: Mechanical, °C		140
Maximum Temperature: Mechanical, °C		260

Specific Heat Capacity, J/kg-K		1750
Specific Heat Capacity, J/kg-K		1130

Thermal Conductivity, W/m-K		0.17
Thermal Conductivity, W/m-K		0.29 to 1.7

Thermal Expansion, µm/m-K		120
Thermal Expansion, µm/m-K		38 to 54

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm		28
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		0.83
Density, g/cm³		1.4 to 1.6

Common Calculations

Strength to Weight: Axial, points		8.0
Strength to Weight: Axial, points		6.5 to 16

Strength to Weight: Bending, points		22
Strength to Weight: Bending, points		16 to 30

Thermal Diffusivity, mm²/s		0.12
Thermal Diffusivity, mm²/s		0.18 to 0.95