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Thermoset PI vs. Epoxy

Both thermoset PI and epoxy are thermoset plastics. There are 16 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, % 2.0 to 5.9
4.5
Tensile Strength: Ultimate (UTS), MPa 37 to 81
67

Thermal Properties

Glass Transition Temperature, °C 360
120
Maximum Temperature: Autoignition, °C 380
430
Maximum Temperature: Decomposition, °C 330
430
Maximum Temperature: Mechanical, °C 260
130
Specific Heat Capacity, J/kg-K 1130
1500
Thermal Conductivity, W/m-K 0.29 to 1.7
0.2
Thermal Expansion, µm/m-K 38 to 54
100

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 20
16
Electrical Resistivity Order of Magnitude, 10x Ω-m 15
13

Otherwise Unclassified Properties

Density, g/cm3 1.4 to 1.6
1.3
Limiting Oxygen Index (LOI), % 40
20

Common Calculations

Strength to Weight: Axial, points 6.5 to 16
14
Strength to Weight: Bending, points 16 to 30
28
Thermal Diffusivity, mm2/s 0.18 to 0.95
0.1