Chlorotrifluoroethylene - CTFE

Polymer Type

Thermoplastic

Advantages

May be transparent if cooled rapidly.  Melt processable.  Higher stiffness than PTFE.  Very low vapour transmission properties in film form.

Disadvantages

Very expensive.  Lower continuous use temperature than ETFE or PFA (approx.  150°C/300°F).  Higher dissipation factor than PTFE.  Inferior chemical resistance to PTFE attacked by some halogenated hydrocarbons, ethers and esters.  Use of CTFE now limited due to competition from other, more recently developed, melt processable polymers, e.g. FEP, PFA, ECTFE & ETFE.

Typical Properties

Property

Value

Density (g/cm3)

2.1

Surface Hardness

RR110

Tensile Strength (MPa)

24

Flexural Modulus (GPa)

1.6

Notched Izod (kJ/m)

0.2

Linear Expansion  (/°C x 10-5)

8

Elongation at Break (%)

150

Strain at Yield (%)

7

Max. Operating Temp. (°C)

150

Water Absorption (%)

0.003

Oxygen Index (%)

95

Flammability UL94

V0

Volume Resistivity (log ohm.cm)

18

Dielectric Strength (MV/m)

48

Dissipation Factor 1kHz

0.01

Dielectric Constant  1kHz

2.5

HDT @ 0.45 MPa (°C)

120

HDT @ 1.80 MPa (°C)

72

Material. Drying  hrs @ (°C)

NA

Melting Temp. Range (°C)

200 - 280

Mould Shrinkage (%)

2

Mould Temp. Range (°C)

80 - 130

Applications

Chemically resistant O rings, gaskets, seals and transparent windows.  Cryogenic applications.  As a film for packaging and sensitive electronics and drugs.

 

Source : Abstracted from Plascams

For more information on Plascams please visit The Rubber and Plastics Research Association

 

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