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Polytetrafluoroethylene ( PTFE )

Material Information

Buy Polytetrafluoroethylene on-line

We stock and supply the following standard forms:
Fibre Film Powder Rod Sheet Sphere Tube
Fibre Film Powder Rod Sheet Sphere Tube

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Common Brand Names:
Fluon, Hostaflon TF
 
General Description:  

General Description : A totally fluorinated polymer which is semi-crystalline, semi-opaque and white. It has outstanding chemical resistance being unaffected by almost all chemicals and also has a very high oxygen index (i.e. is inherently non-flam). It has a very low coefficient of friction and is stable to high temperatures. It is soft, easily deformed, very prone to creep and low in strength with poor radiation resistance. It is relatively expensive and cannot be melt-processed (although in theory it melts at 327C, the melt viscosity of normal grades is virtually infinite) and so is formed by powder sintering methods.

Industrial applications include bearings, seals, O-rings, high temperature electrical insulation, non-stick coatings and linings for vessels etc, etc. Its unusual properties make it invaluable for a wide range of laboratory applications.

   

Chemical Resistance

Acids - concentrated Good
Acids - dilute Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Good
Greases and Oils Good
Halogenated Hydrocarbons Good
Halogens Good
Ketones Good

Electrical Properties

Dielectric constant @1MHz 2.0-2.1
Dielectric strength ( kV mm-1 ) 50-170
Dissipation factor @ 1MHz 0.0003 - 0.0007
Surface resistivity ( Ohm/sq ) 1017
Volume resistivity ( Ohmcm ) 1018-1019

Mechanical Properties

Coefficient of friction 0.05-0.2
Elongation at break ( % ) 400
Hardness - Rockwell D50-55 - Shore
Izod impact strength ( J m-1 ) 160
Poisson's ratio 0.46
Tensile modulus ( GPa ) 0.3-0.8
Tensile strength ( MPa ) 10-40

Physical Properties

Density ( g cm-3 ) 2.2
Flammability V0
Limiting oxygen index ( % ) 95
Radiation resistance Poor
Refractive index 1.38
Resistance to Ultra-violet Excellent
Water absorption - over 24 hours ( % ) 0.01

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 100-160
Heat-deflection temperature - 0.45MPa ( C ) 120
Heat-deflection temperature - 1.8MPa ( C ) 54
Lower working temperature ( C ) -260
Specific heat ( J K-1 kg-1 ) 1000
Thermal conductivity @23C ( W m-1 K-1 ) 0.25
Upper working temperature ( C ) 180-260

Properties for Polytetrafluoroethylene Film

Property Value
Dielectric Strength @25µm thick kV mm-1 160
Dissipation Factor @1MHz <0.0001
Elongation at Break % 100-400
Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 7
Permeability to Hydrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 7
Permeability to Nitrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 1
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 3
Permeability to Water @25C x10-13 cm3. cm cm-2 s-1 Pa-1 25?

Buy Polytetrafluoroethylene on-line

We stock and supply the following standard forms:
Fibre Film Powder Rod Sheet Sphere Tube
Fibre Film Powder Rod Sheet Sphere Tube

Choose a form to search our on-line catalogue  

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