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Phenolic vs. PMMA

Phenolic belongs to the thermoset plastics classification, while PMMA belongs to the thermoplastics. There are 18 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is phenolic and the bottom bar is PMMA.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 3.8
3.2
Elongation at Break, % 2.0
4.0
Tensile Strength: Ultimate (UTS), MPa 48
71

Thermal Properties

Glass Transition Temperature, °C 170
110
Maximum Temperature: Autoignition, °C 430
320
Maximum Temperature: Decomposition, °C 260
360
Specific Heat Capacity, J/kg-K 1400
1260
Thermal Conductivity, W/m-K 0.25
0.19
Thermal Expansion, µm/m-K 120
76

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 46
30

Otherwise Unclassified Properties

Density, g/cm3 1.3
1.2
Limiting Oxygen Index (LOI), % 27
17

Common Calculations

Stiffness to Weight: Axial, points 1.6
1.5
Stiffness to Weight: Bending, points 40
42
Strength to Weight: Axial, points 10
17
Strength to Weight: Bending, points 23
32
Thermal Diffusivity, mm2/s 0.14
0.13
Thermal Shock Resistance, points 7.5
21