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UPVC vs. PBI

UPVC belongs to the thermoplastics classification, while PBI belongs to the thermoset plastics. There are 25 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 uPVC and the bottom bar is PBI.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 3.7
5.9
Elongation at Break, % 58
3.0
Flexural Modulus, GPa 3.5
6.5
Flexural Strength, MPa 80
220
Impact Strength: Notched Izod, J/m 360
27
Tensile Strength: Ultimate (UTS), MPa 47
160

Thermal Properties

Glass Transition Temperature, °C 85
410
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 69
430
Maximum Temperature: Decomposition, °C 270
590
Maximum Temperature: Mechanical, °C 95
340
Specific Heat Capacity, J/kg-K 880
930
Thermal Conductivity, W/m-K 0.16
0.41
Thermal Expansion, µm/m-K 61
23

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 3.4
3.4
Dielectric Strength (Breakdown Potential), kV/mm 19
23
Electrical Resistivity Order of Magnitude, 10x Ω-m 15
13

Otherwise Unclassified Properties

Density, g/cm3 1.4
1.3
Limiting Oxygen Index (LOI), % 42
58
Water Absorption After 24 Hours, % 0.24
0.4

Common Calculations

Stiffness to Weight: Axial, points 1.5
2.5
Stiffness to Weight: Bending, points 37
46
Strength to Weight: Axial, points 9.1
34
Strength to Weight: Bending, points 20
50
Thermal Diffusivity, mm2/s 0.13
0.34
Thermal Shock Resistance, points 15
84