PTFE vs. ECTFE

Both PTFE and ECTFE are thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

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

Polytetrafluoroethylene (PTFE)Ethylene Chlorotrifluoroethylene (ECTFE)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		75 to 300
Elongation at Break, %		230

Flexural Modulus, GPa		0.4 to 1.3
Flexural Modulus, GPa		1.7

Flexural Strength, MPa		13 to 50
Flexural Strength, MPa		47

Tensile Strength: Ultimate (UTS), MPa		13 to 25
Tensile Strength: Ultimate (UTS), MPa		49

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		150

Melting Onset (Solidus), °C		330 to 340
Melting Onset (Solidus), °C		240

Thermal Conductivity, W/m-K		0.24 to 0.65
Thermal Conductivity, W/m-K		0.15

Thermal Expansion, µm/m-K		110 to 120
Thermal Expansion, µm/m-K		100

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz		2.1 to 2.4
Dielectric Constant (Relative Permittivity) At 1 MHz		2.6

Electrical Resistivity Order of Magnitude, 10^x Ω-m		2.0 to 18
Electrical Resistivity Order of Magnitude, 10^x Ω-m		14

Otherwise Unclassified Properties

Density, g/cm³		2.1 to 2.3
Density, g/cm³		1.7

Limiting Oxygen Index (LOI), %		90
Limiting Oxygen Index (LOI), %		60

Water Absorption After 24 Hours, %		0.0093 to 0.050
Water Absorption After 24 Hours, %		0.094

Common Calculations

Strength to Weight: Axial, points		1.7 to 3.2
Strength to Weight: Axial, points		8.1

Strength to Weight: Bending, points		5.7 to 8.7
Strength to Weight: Bending, points		18