Polytetrafluoroethylene (PTFE)

PTFE is a thermoplastic material, further classified as a fluoroplastic.

It has three common variants, each represented as a separate material.

Material Properties

Compressive (Crushing) Strength12 to 6800 MPa (1.7 to 990 x 103 psi)

Density2.1 to 2.3 g/cm3 (130 to 140 lb/ft3)

Dielectric Constant (Relative Permittivity)2.1 to 2.4

Electrical Resistivity Order of Magnitude2 to 19 10x Ω-m

Elongation at Break75 to 300 %

Flexural Modulus0.4 to 1.3 GPa (0.058 to 0.19 x 106 psi)

Flexural Strength13 to 16 MPa (1.9 to 2.3 x 103 psi)

Limiting Oxygen Index (LOI)90 %

Melting Onset (Solidus)330 to 340 °C (630 to 640 °F)

Strength to Weight Ratio6.2 to 11 kN-m/kg

Tensile Strength: Ultimate (UTS)13 to 25 MPa (1.9 to 3.6 x 103 psi)

Thermal Conductivity0.24 to 0.65 W/m-K

Thermal Expansion110 to 130 µm/m-K

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