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Ethylene Chlorotrifluoroethylene (ECTFE)

ECTFE is a fluoroplastic (fluorine-based thermoplastic). It has a fairly high density and a fairly high ductility among thermoplastics. The graph bars on the material properties cards below compare ECTFE to: fluoroplastics (top), all thermoplastics (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

1.6 GPa 0.23 x 106 psi

Elongation at Break

230 %

Flexural Modulus

1.7 GPa 0.24 x 106 psi

Flexural Strength

47 MPa 6.8 x 103 psi

Rockwell R Hardness


Tensile Strength: Ultimate (UTS)

49 MPa 7.1 x 103 psi

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi)

91 °C 190 °F

Heat Deflection Temperature At 455 kPa (66 psi)

110 °C 220 °F

Maximum Temperature: Autoignition

620 °C 1140 °F

Maximum Temperature: Decomposition

450 °C 830 °F

Maximum Temperature: Mechanical

150 °C 310 °F

Melting Onset (Solidus)

240 °C 460 °F

Specific Heat Capacity

1170 J/kg-K 0.28 BTU/lb-°F

Thermal Conductivity

0.15 W/m-K 0.089 BTU/h-ft-°F

Thermal Expansion

100 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz


Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

18 kV/mm 0.68 V/mil

Electrical Resistivity Order of Magnitude

14 10x Ω-m

Otherwise Unclassified Properties


1.7 g/cm3 110 lb/ft3

Limiting Oxygen Index (LOI)

60 %

Water Absorption After 24 Hours

0.094 %

Common Calculations

Stiffness to Weight: Axial

0.52 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

8.1 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

0.078 mm2/s

Thermal Shock Resistance

22 points

Followup Questions

Further Reading

Fluoroplastics: Volume 2 - Melt Processable Fluoropolymers, Sina Ebnesajjad, 2003

SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 5th ed., Michael L. Berins (editor), 2000

Modern Plastics Handbook, Charles A. Harper (editor), 1999

Plastics Materials, 7th ed., J. A. Brydson, 1999