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LDPE vs. PET

Both LDPE and PET are thermoplastics. There are 13 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 0.3
3.5 to 11
Tensile Strength: Ultimate (UTS), MPa 7.0
60 to 140

Thermal Properties

Glass Transition Temperature, °C -130
70
Maximum Temperature: Autoignition, °C 380
410
Maximum Temperature: Decomposition, °C 400
390
Melting Onset (Solidus), °C 110
260
Specific Heat Capacity, J/kg-K 2300
1000 to 1150

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 2.3
3.7

Otherwise Unclassified Properties

Density, g/cm3 0.92
1.4 to 1.6

Common Calculations

Stiffness to Weight: Axial, points 0.18
1.2 to 4.4
Stiffness to Weight: Bending, points 24
32 to 54
Strength to Weight: Axial, points 2.1
12 to 27
Strength to Weight: Bending, points 8.8
25 to 41