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PLA vs. PET

Both PLA and PET are thermoplastics. There are 12 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is PLA and the bottom bar is PET.

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 3.5
3.5 to 11
Elongation at Break, % 6.0
2.5 to 70
Flexural Modulus, GPa 4.0
8.3 to 14
Tensile Strength: Ultimate (UTS), MPa 50
60 to 140

Thermal Properties

Glass Transition Temperature, °C 60
70
Melting Onset (Solidus), °C 160
260
Specific Heat Capacity, J/kg-K 1800
1000 to 1150

Otherwise Unclassified Properties

Density, g/cm3 1.3
1.4 to 1.6

Common Calculations

Stiffness to Weight: Axial, points 1.6
1.2 to 4.4
Stiffness to Weight: Bending, points 40
32 to 54
Strength to Weight: Axial, points 11
12 to 27
Strength to Weight: Bending, points 24
25 to 41