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PBT vs. PS

Both PBT and PS are thermoplastics. There are 14 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 PBT and the bottom bar is PS.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 2.7 to 8.7
1.9 to 2.9
Elongation at Break, % 2.5 to 43
1.8 to 40
Flexural Strength, MPa 79 to 210
62 to 80
Tensile Strength: Ultimate (UTS), MPa 58 to 140
32 to 44

Thermal Properties

Glass Transition Temperature, °C 40
100
Maximum Temperature: Autoignition, °C 380
360 to 420
Maximum Temperature: Decomposition, °C 380
320 to 330
Specific Heat Capacity, J/kg-K 1040 to 1200
1250 to 1400

Otherwise Unclassified Properties

Density, g/cm3 1.3 to 1.5
1.0
Limiting Oxygen Index (LOI), % 20
18

Common Calculations

Stiffness to Weight: Axial, points 1.1 to 3.2
1.0 to 1.5
Stiffness to Weight: Bending, points 35 to 45
40 to 45
Strength to Weight: Axial, points 12 to 25
8.5 to 12
Strength to Weight: Bending, points 25 to 38
22 to 26