PAR vs. PTFE

Both PAR and PTFE are thermoplastics. There are 14 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is PAR and the bottom bar is PTFE.

Polyarylate (PAR)Polytetrafluoroethylene (PTFE)

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa		93
Compressive (Crushing) Strength, MPa		6.9 to 24

Elongation at Break, %		50
Elongation at Break, %		75 to 300

Flexural Modulus, GPa		2.1
Flexural Modulus, GPa		0.4 to 1.3

Flexural Strength, MPa		75
Flexural Strength, MPa		13 to 50

Tensile Strength: Ultimate (UTS), MPa		67
Tensile Strength: Ultimate (UTS), MPa		13 to 25

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi), °C		170
Heat Deflection Temperature At 1.82 MPa (264 psi), °C		66 to 70

Thermal Conductivity, W/m-K		0.18
Thermal Conductivity, W/m-K		0.24 to 0.65

Thermal Expansion, µm/m-K		88
Thermal Expansion, µm/m-K		110 to 120

Electrical Properties

Electrical Resistivity Order of Magnitude, 10^x Ω-m		12
Electrical Resistivity Order of Magnitude, 10^x Ω-m		2.0 to 18

Otherwise Unclassified Properties

Density, g/cm³		1.2
Density, g/cm³		2.1 to 2.3

Limiting Oxygen Index (LOI), %		35
Limiting Oxygen Index (LOI), %		90

Water Absorption After 24 Hours, %		0.26
Water Absorption After 24 Hours, %		0.0093 to 0.050

Common Calculations

Strength to Weight: Axial, points		16
Strength to Weight: Axial, points		1.7 to 3.2

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