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PETG vs. Unfilled PBT

Both PETG and unfilled PBT are thermoplastics. There are 24 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 PETG and the bottom bar is unfilled PBT.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 55
76
Elastic (Young's, Tensile) Modulus, GPa 2.2
2.7
Flexural Modulus, GPa 2.1
2.6
Flexural Strength, MPa 77
79
Impact Strength: Notched Izod, J/m 77
47
Rockwell R Hardness 120
120
Tensile Strength: Ultimate (UTS), MPa 53
58

Thermal Properties

Glass Transition Temperature, °C 81
40
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 69
4.0
Heat Deflection Temperature At 455 kPa (66 psi), °C 73
160
Melting Onset (Solidus), °C 140
230
Specific Heat Capacity, J/kg-K 1200
1200
Thermal Conductivity, W/m-K 0.29
0.21
Thermal Expansion, µm/m-K 68
84

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 2.6
3.4
Dielectric Strength (Breakdown Potential), kV/mm 16
26

Otherwise Unclassified Properties

Density, g/cm3 1.3
1.3
Water Absorption After 24 Hours, % 0.2
0.070

Common Calculations

Stiffness to Weight: Axial, points 1.0
1.1
Stiffness to Weight: Bending, points 34
35
Strength to Weight: Axial, points 12
12
Strength to Weight: Bending, points 25
25
Thermal Diffusivity, mm2/s 0.19
0.13
Thermal Shock Resistance, points 25
18