PTFE vs. PAS

Both PTFE and PAS are thermoplastics. There are 14 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 PTFE and the bottom bar is PAS.

Polytetrafluoroethylene (PTFE)Polyarylsulfone (PAS)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		75 to 300
Elongation at Break, %		40

Flexural Modulus, GPa		0.4 to 1.3
Flexural Modulus, GPa		2.8

Flexural Strength, MPa		13 to 50
Flexural Strength, MPa		110

Tensile Strength: Ultimate (UTS), MPa		13 to 25
Tensile Strength: Ultimate (UTS), MPa		83

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi), °C		66 to 70
Heat Deflection Temperature At 1.82 MPa (264 psi), °C		200

Thermal Expansion, µm/m-K		110 to 120
Thermal Expansion, µm/m-K		49

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz		2.1 to 2.4
Dielectric Constant (Relative Permittivity) At 1 MHz		3.5

Electrical Dissipation At 1 MHz		0.00017 to 0.050
Electrical Dissipation At 1 MHz		0.0056

Electrical Resistivity Order of Magnitude, 10^x Ω-m		2.0 to 18
Electrical Resistivity Order of Magnitude, 10^x Ω-m		15

Otherwise Unclassified Properties

Density, g/cm³		2.1 to 2.3
Density, g/cm³		1.4

Limiting Oxygen Index (LOI), %		90
Limiting Oxygen Index (LOI), %		33

Water Absorption After 24 Hours, %		0.0093 to 0.050
Water Absorption After 24 Hours, %		0.4

Common Calculations

Strength to Weight: Axial, points		1.7 to 3.2
Strength to Weight: Axial, points		17

Strength to Weight: Bending, points		5.7 to 8.7
Strength to Weight: Bending, points		31