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PMMA vs. PET

Both PMMA and PET are thermoplastics. There are 16 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 PMMA and the bottom bar is PET.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 3.2
3.5 to 11
Elongation at Break, % 4.0
2.5 to 70
Impact Strength: Notched Izod, J/m 74
43 to 85
Tensile Strength: Ultimate (UTS), MPa 71
60 to 140

Thermal Properties

Glass Transition Temperature, °C 110
70
Maximum Temperature: Autoignition, °C 320
410
Maximum Temperature: Decomposition, °C 360
390
Melting Onset (Solidus), °C 180
260
Specific Heat Capacity, J/kg-K 1260
1000 to 1150

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 3.6
3.7

Otherwise Unclassified Properties

Density, g/cm3 1.2
1.4 to 1.6
Limiting Oxygen Index (LOI), % 17
21

Common Calculations

Stiffness to Weight: Axial, points 1.5
1.2 to 4.4
Stiffness to Weight: Bending, points 42
32 to 54
Strength to Weight: Axial, points 17
12 to 27
Strength to Weight: Bending, points 32
25 to 41