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PFA vs. PS

Both PFA and PS are thermoplastics. There are 14 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is PFA and the bottom bar is PS.

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, % 300
1.8 to 40
Tensile Strength: Ultimate (UTS), MPa 30
32 to 44

Thermal Properties

Maximum Temperature: Mechanical, °C 260
70
Specific Heat Capacity, J/kg-K 1000
1250 to 1400
Thermal Conductivity, W/m-K 0.25
0.14 to 0.22
Thermal Expansion, µm/m-K 120
80 to 98

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 22
18 to 20
Electrical Resistivity Order of Magnitude, 10x Ω-m 16
14 to 15

Otherwise Unclassified Properties

Density, g/cm3 2.2
1.0
Limiting Oxygen Index (LOI), % 80
18
Water Absorption After 24 Hours, % 0
0.040 to 0.080

Common Calculations

Strength to Weight: Axial, points 3.9
8.5 to 12
Strength to Weight: Bending, points 10
22 to 26
Thermal Diffusivity, mm2/s 0.12
0.11 to 0.15