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Melamine vs. PEI

Melamine belongs to the thermoset plastics classification, while PEI belongs to the thermoplastics. There are 17 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is melamine and the bottom bar is PEI.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 7.0
3.4 to 5.6
Elongation at Break, % 1.0
3.0 to 34
Tensile Strength: Ultimate (UTS), MPa 30
110 to 160

Thermal Properties

Maximum Temperature: Autoignition, °C 350
530
Maximum Temperature: Decomposition, °C 350
530
Specific Heat Capacity, J/kg-K 1200
1050 to 1220
Thermal Conductivity, W/m-K 0.5
0.18 to 0.23
Thermal Expansion, µm/m-K 60
20 to 53

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 30
30 to 33
Electrical Resistivity Order of Magnitude, 10x Ω-m 9.0
14 to 15

Otherwise Unclassified Properties

Density, g/cm3 1.5
1.3 to 1.5

Common Calculations

Stiffness to Weight: Axial, points 2.6
1.5 to 2.1
Stiffness to Weight: Bending, points 43
39
Strength to Weight: Axial, points 5.6
24 to 30
Strength to Weight: Bending, points 14
40 to 44
Thermal Diffusivity, mm2/s 0.28
0.11 to 0.14
Thermal Shock Resistance, points 5.1
44 to 100