Editorial Feature

Polytetrafluoroethylene - PTFE 15% Glass Fibre Filled

Sep 5 2001

Polytetrafluroethylene (PTFE) is made entirely of carbon and fluorine, giving it a high molecular weight. It is a synthetic fluoropolymer of tetrafluoroethylene and is hydrophobic (not wetable) due to the strong electronegativity of the fluorine.

Compared to other solids, PTFE has one of the lowest coefficients of friction. It therefore finds use in a number of cooking applications as ingredients won't stick to PTFE coatings. Its strong carbon-fluorine bonds make it very non-reactive and so it is often employed in pipelines containing particularly corrosive and reactive chemicals. PTFE can also be used in machinery as a lubricant, reducing wear, friction and energy consumption. Modifying PTFE can improve its properties.

Polymer Type

Thermoplastic

Advantages

A number of advantages can be achieved by modifying PTFE:

  • Improved wear resistance

  • Higher Surface hardness

  • Improved Creep resistance

  • Higher Flexural modulus.

Disadvantages

There are some associated disadvantages when modifying PTFE:

  • Lower notched impact strength

  • Reduced tensile strength

  • Lower elongation at break

  • Poor electrical characteristics

Typical Properties

Property

Value

Density (g/cm3)

2.2

Surface Hardness

SD68

Tensile Strength (MPa)

22

Flexural Modulus (GPa)

1.1

Notched Izod (kJ/m)

0.14

Linear Expansion  (/°C x 10-5)

12.4

Elongation at Break (%)

340

Strain at Yield (%)

N/Y

Max. Operating Temp. (°C)

180

Water Absorption (%)

0.01

Oxygen Index (%)

95

Flammability UL94

V0

Volume Resistivity (log ohm.cm)

16

Dielectric Strength (MV/m)

40

Dissipation Factor 1kHz

0.002

Dielectric Constant  1kHz

2.6

HDT @ 0.45 MPa (°C)

122

HDT @ 1.80 MPa (°C)

105

Material. Drying  hrs @ (°C)

NA

Melting Temp. Range (°C)

NA

Mould Shrinkage (%)

NA

Mould Temp. Range (°C)

NA

Applications

  • Wear pads

  • Piston rings

  • Coatings for pans, cookware and microwave oven rotating platforms

  • Containers and pipelines for chemicals

  • Lubricant in machinery

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

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