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Polytetrafluoroethylene (PTFE)

PTFE is a fluoroplastic (fluorine-based thermoplastic). It can have a fairly high density among thermoplastics. In addition, it can have a moderately high ductility and a fairly low tensile strength. It has three common variants, each represented as a separate material. The material properties section shows ranges encompassing all variants. To see the details of each variant on a separate page, follow the links in the Variant Materials section further below.

Mechanical Properties

Graph bars compare PTFE to other materials. From top to bottom: fluoroplastic, thermoplastics, and the entire database.

Compressive (Crushing) Strength

12 to 6800 MPa 1.7 to 990 x 103 psi

Elongation at Break

75 to 300 %

Flexural Modulus

0.4 to 1.3 GPa 0.058 to 0.19 x 106 psi

Flexural Strength

13 to 50 MPa 1.9 to 7.3 x 103 psi

Strength to Weight Ratio

6.2 to 11 kN-m/kg

Tensile Strength: Ultimate (UTS)

13 to 25 MPa 1.9 to 3.6 x 103 psi

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi)

66 to 70 °C 150 to 160 °F

Melting Onset (Solidus)

330 to 340 °C 630 to 640 °F

Thermal Conductivity

0.24 to 0.65 W/m-K 0.14 to 0.38 BTU/h-ft-°F

Thermal Expansion

110 to 120 µm/m-K

Other Material Properties

Density

2.1 to 2.3 g/cm3 130 to 140 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 MHz

2.1 to 2.4

Electrical Dissipation At 1 MHz

0.00017 to 0.050

Electrical Resistivity Order of Magnitude

2.0 to 19 10x Ω-m

Limiting Oxygen Index (LOI)

90 %

Water Absorption After 24 Hours

0.0092 to 0.050 %

Followup Questions

Variant Materials

Further Reading

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

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

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

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