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PPE vs. RPU

PPE belongs to the thermoplastics classification, while RPU belongs to the thermoset plastics. There are 18 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is PPE and the bottom bar is RPU.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 2.3
2.2
Elongation at Break, % 30
90
Flexural Strength, MPa 75
83
Tensile Strength: Ultimate (UTS), MPa 55
60

Thermal Properties

Maximum Temperature: Autoignition, °C 430
380
Specific Heat Capacity, J/kg-K 1200
1750
Thermal Conductivity, W/m-K 0.22
0.19
Thermal Expansion, µm/m-K 90
63
Vicat Softening Temperature, °C 140
120

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 19
19
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
13

Otherwise Unclassified Properties

Density, g/cm3 1.1
1.2

Common Calculations

Stiffness to Weight: Axial, points 1.2
1.0
Stiffness to Weight: Bending, points 42
36
Strength to Weight: Axial, points 14
14
Strength to Weight: Bending, points 30
28
Thermal Diffusivity, mm2/s 0.17
0.090
Thermal Shock Resistance, points 19
31