MakeItFrom.com
Menu (ESC)

Unfilled PTFE

Unfilled PTFE is a grade of PTFE. It has the highest strength and highest ductility compared to the other variants of PTFE. The graph bars on the material properties cards below compare unfilled PTFE 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

Compressive (Crushing) Strength

24 MPa 3.5 x 103 psi

Elastic (Young's, Tensile) Modulus

0.45 GPa 0.065 x 106 psi

Elongation at Break

300 %

Flexural Modulus

0.4 GPa 0.058 x 106 psi

Flexural Strength

50 MPa 7.3 x 103 psi

Impact Strength: Notched Izod

170 J/m 3.2 ft-lb/in

Tensile Strength: Ultimate (UTS)

25 MPa 3.6 x 103 psi

Thermal Properties

Glass Transition Temperature

-35 °C -31 °F

Heat Deflection Temperature At 1.82 MPa (264 psi)

70 °C 160 °F

Heat Deflection Temperature At 455 kPa (66 psi)

120 °C 250 °F

Maximum Temperature: Autoignition

630 °C 1170 °F

Maximum Temperature: Decomposition

540 °C 1000 °F

Maximum Temperature: Mechanical

270 °C 510 °F

Melting Onset (Solidus)

330 °C 630 °F

Specific Heat Capacity

1050 J/kg-K 0.25 BTU/lb-°F

Thermal Conductivity

0.24 W/m-K 0.14 BTU/h-ft-°F

Thermal Expansion

120 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz

2.1

Dielectric Strength (Breakdown Potential)

14 kV/mm 0.56 V/mil

Electrical Dissipation At 1 MHz

0.00017

Electrical Resistivity Order of Magnitude

18 10x Ω-m

Otherwise Unclassified Properties

Density

2.2 g/cm3 140 lb/ft3

Limiting Oxygen Index (LOI)

90 %

Refractive Index

1.4

Water Absorption After 24 Hours

0.0093 %

Common Calculations

Stiffness to Weight: Axial

0.12 points

Stiffness to Weight: Bending

12 points

Strength to Weight: Axial

3.2 points

Strength to Weight: Bending

8.7 points

Thermal Diffusivity

0.11 mm2/s

Thermal Shock Resistance

34 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