PTFE vs. CPVC

Both PTFE and CPVC are thermoplastics. There are 15 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

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

Polytetrafluoroethylene (PTFE)Chlorinated Polyvinyl Chloride (CPVC, PVC-C)

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa		6.9 to 24
Compressive (Crushing) Strength, MPa		70

Elongation at Break, %		75 to 300
Elongation at Break, %		4.0

Flexural Modulus, GPa		0.4 to 1.3
Flexural Modulus, GPa		2.5

Flexural Strength, MPa		13 to 50
Flexural Strength, MPa		100

Tensile Strength: Ultimate (UTS), MPa		13 to 25
Tensile Strength: Ultimate (UTS), MPa		50

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		91

Maximum Temperature: Mechanical, °C		260 to 270
Maximum Temperature: Mechanical, °C		80

Thermal Conductivity, W/m-K		0.24 to 0.65
Thermal Conductivity, W/m-K		0.31

Thermal Expansion, µm/m-K		110 to 120
Thermal Expansion, µm/m-K		65

Electrical Properties

Electrical Resistivity Order of Magnitude, 10^x Ω-m		2.0 to 18
Electrical Resistivity Order of Magnitude, 10^x Ω-m		13

Otherwise Unclassified Properties

Density, g/cm³		2.1 to 2.3
Density, g/cm³		1.5

Limiting Oxygen Index (LOI), %		90
Limiting Oxygen Index (LOI), %		57

Water Absorption After 24 Hours, %		0.0093 to 0.050
Water Absorption After 24 Hours, %		0.030

Common Calculations

Strength to Weight: Axial, points		1.7 to 3.2
Strength to Weight: Axial, points		9.4

Strength to Weight: Bending, points		5.7 to 8.7
Strength to Weight: Bending, points		20