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PMMA vs. PS

Both PMMA and PS are thermoplastics. There are 21 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 PMMA and the bottom bar is PS.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 3.2
1.9 to 2.9
Elongation at Break, % 4.0
1.8 to 40
Flexural Strength, MPa 110
62 to 80
Impact Strength: Notched Izod, J/m 74
19 to 45
Tensile Strength: Ultimate (UTS), MPa 71
32 to 44

Thermal Properties

Glass Transition Temperature, °C 110
100
Maximum Temperature: Autoignition, °C 320
360 to 420
Maximum Temperature: Decomposition, °C 360
320 to 330
Specific Heat Capacity, J/kg-K 1260
1250 to 1400
Thermal Conductivity, W/m-K 0.19
0.14 to 0.22
Thermal Expansion, µm/m-K 76
80 to 98
Vicat Softening Temperature, °C 90
100 to 110

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 30
18 to 20

Otherwise Unclassified Properties

Density, g/cm3 1.2
1.0
Limiting Oxygen Index (LOI), % 17
18

Common Calculations

Stiffness to Weight: Axial, points 1.5
1.0 to 1.5
Stiffness to Weight: Bending, points 42
40 to 45
Strength to Weight: Axial, points 17
8.5 to 12
Strength to Weight: Bending, points 32
22 to 26
Thermal Diffusivity, mm2/s 0.13
0.11 to 0.15
Thermal Shock Resistance, points 21
11 to 15