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FEP vs. PMMA

Both FEP and PMMA are thermoplastics. There are 22 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 0.43
3.2
Elongation at Break, % 300
4.0
Flexural Strength, MPa 24
110
Tensile Strength: Ultimate (UTS), MPa 20
71

Thermal Properties

Glass Transition Temperature, °C 60
110
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 50
96
Maximum Temperature: Autoignition, °C 630
320
Melting Onset (Solidus), °C 260
180
Specific Heat Capacity, J/kg-K 1170
1260
Thermal Conductivity, W/m-K 0.22
0.19
Thermal Expansion, µm/m-K 95
76

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 1.9
3.6
Dielectric Strength (Breakdown Potential), kV/mm 22
30

Otherwise Unclassified Properties

Density, g/cm3 2.1
1.2
Limiting Oxygen Index (LOI), % 80
17
Refractive Index 1.4
1.5

Common Calculations

Stiffness to Weight: Axial, points 0.11
1.5
Stiffness to Weight: Bending, points 12
42
Strength to Weight: Axial, points 2.6
17
Strength to Weight: Bending, points 7.6
32
Thermal Diffusivity, mm2/s 0.088
0.13
Thermal Shock Resistance, points 35
21