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FEP vs. PAR

Both FEP and PAR are thermoplastics. There are 23 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 FEP and the bottom bar is PAR.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 0.43
2.0
Elongation at Break, % 300
50
Flexural Modulus, GPa 0.6
2.1
Flexural Strength, MPa 24
75
Tensile Strength: Ultimate (UTS), MPa 20
67

Thermal Properties

Glass Transition Temperature, °C 60
190
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 50
170
Heat Deflection Temperature At 455 kPa (66 psi), °C 70
180
Specific Heat Capacity, J/kg-K 1170
1200
Thermal Conductivity, W/m-K 0.22
0.18
Thermal Expansion, µm/m-K 95
88

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 1.9
3.0
Dielectric Strength (Breakdown Potential), kV/mm 22
16
Electrical Resistivity Order of Magnitude, 10x Ω-m 16
12

Otherwise Unclassified Properties

Density, g/cm3 2.1
1.2
Limiting Oxygen Index (LOI), % 80
35
Water Absorption After 24 Hours, % 0.010
0.26

Common Calculations

Stiffness to Weight: Axial, points 0.11
0.93
Stiffness to Weight: Bending, points 12
35
Strength to Weight: Axial, points 2.6
16
Strength to Weight: Bending, points 7.6
31
Thermal Diffusivity, mm2/s 0.088
0.13
Thermal Shock Resistance, points 35
27