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Thermoset PI vs. Phenolic

Both thermoset PI and phenolic are thermoset plastics. There are 17 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, % 2.0 to 5.9
2.0
Tensile Strength: Ultimate (UTS), MPa 37 to 81
48

Thermal Properties

Glass Transition Temperature, °C 360
170
Maximum Temperature: Autoignition, °C 380
430
Maximum Temperature: Decomposition, °C 330
260
Maximum Temperature: Mechanical, °C 260
150
Specific Heat Capacity, J/kg-K 1130
1400
Thermal Conductivity, W/m-K 0.29 to 1.7
0.25
Thermal Expansion, µm/m-K 38 to 54
120

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 3.1
7.5
Dielectric Strength (Breakdown Potential), kV/mm 20
46
Electrical Resistivity Order of Magnitude, 10x Ω-m 15
11

Otherwise Unclassified Properties

Density, g/cm3 1.4 to 1.6
1.3
Limiting Oxygen Index (LOI), % 40
27

Common Calculations

Strength to Weight: Axial, points 6.5 to 16
10
Strength to Weight: Bending, points 16 to 30
23
Thermal Diffusivity, mm2/s 0.18 to 0.95
0.14