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General Polytetrafluoroethylene (PTFE)

Alternative and trade names
Teflon®
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Description

Unfilled, no additives.

Properties

Electrical

Dielectric constant εr

2.1 [-] at 20 °C

Electrical resistivity ρel

1.00E+18 Ω·m at 20 °C

General

Density ρ

2.13 - 2.23 g/cm³ at 20 °C

Mechanical

Elastic modulus E

0.4 - 0.75 GPa at 20 °C

Elongation A

350 - 550 % at 20 °C

Impact strength, Charpy notched Ivnot

13 - 15 kJ/m² at 20 °C

Impact strength, Charpy unnotched Iunnot

no break

Max allowed stress σmax

20 - 35 MPa at 20 °C

at 350-500% strain

Optical

Transparency

no

Thermal

Coefficient of thermal expansion α

1E-4 - 2E-4 1/K at 20 °C

Flammability

UL 94 V0

Max service temperature, long Tmaxlong

260 °C

Max service temperature, short Tmaxshort

300 °C

Melting point Tm

325 - 335 °C

Specific heat capacity cp

1000 J/(kg·K) at 20 °C

Thermal conductivity λ

0.25 W/(m·K) at 20 °C

Technological properties

Application areas

Pan-coating, body implants, high temperature capacitors, carriers for printed circuit boards, pistons

Fillers

Glass fibre, carbon powder, carbon fibre

Processing methods

Extrusion, compression molding, coating

This material data has been provided by M-Base.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.