Polyvinylidenefluoride (PVDF) Film

Alternative and trade names
Floraflon, Kynar, Solef
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Description

PVDF is a semi-crystalline, semi-opaque and white engineering thermoplastic that is melt processable and very expensive. It has good temperature and general chemical resistance (though neither are as good as PTFE’s) and good abrasion and radiation resistance. It is somewhat stiffer and stronger than most (melt-processable) fluoropolymers but has high dielectric losses. It has a highly dipolar molecule so that, if the correct morphology is achieved, valuable piezo- and pyro-electric properties result.


The desired form is known as the β phase or Form I, in which the predominantly ""head to tail"" polymer chains have an all-trans extended planar zig-zag form with the dipoles of adjacent chains parallel to one another. This is formed from the more common Alpha phase (Form II) by mechanical deformation followed by electrical polarisation at very high electrical fields. In practice, both uniaxial and biaxial mechanical orientations are used which, after poling, give a different balance of piezo-/pyroelectric properties.

Properties

General

Permeability to carbon dioxide pCO2

0.2 cm³·cm/ cm²·s·Pa at 25 °C

Permeability to nitrogen pN2

0.03 cm³·cm/ cm²·s·Pa at 25 °C

Permeability to oxygen pO2

0.03 cm³·cm/ cm²·s·Pa at 25 °C

Permeability to water vapour pvapour

250 cm³·cm/ cm²·s·Pa at 38 °C

Shrinkage cshrink

2.5 - 25 % at 20 °C

uni-axial

Mechanical

Elastic modulus E

1.8 - 2 GPa at 20 °C

uni-axial

Elastic modulus, transverse E

1.7 - 2.7 GPa at 20 °C

uni-axial

Extension to break, crystalline Ebreak,cryst

50 % at 20 °C

Extension to break, crystalline transverse Ebreak,cryst,trans

50 % at 20 °C

Extension to break, monoaxial Ebreak,mono

14 - 20 % at 20 °C

Extension to break, monoaxial transverse Ebreak,mono,trans

300 - 450 % at 20 °C

Tensile strength Rm

180 - 290 MPa at 20 °C

uni-axial

Tensile strength, transverse Rm,trans

29 - 38 MPa at 20 °C

uni-axial

Thermal

Heat-sealing temperature Theat-seal

204 - 218 °C

Electrical

Dielectric constant εr

12 [-] at 20 °C

at 1kHz, uni-axial

Dielectric strength EDS

160 kV/mm at 20 °C

25µm thick, uni-axial

Dissipation factor, 1KHz ε''1KHz

0.02 [-] at 20 °C

uni-axial

Electrical resistivity ρel

1.80E+13 Ω·m at 20 °C

uni-axial

Piezo coefficient d31 Cpiezo,d31

18 - 20 pC/N at 20 °C

uni-axial

Piezo coefficient d32 Cpiezo,d32

2 pC/N at 20 °C

uni-axial

Piezo coefficient d33 Cpiezo,d33

-20 pC/N at 20 °C

uni-axial

Piezo coefficient d3h Cpiezo,d3h

-6.5 pC/N at 20 °C

uni-axial

Piezo coefficient g31 Cpiezo,g31

0.15 Vm/N at 20 °C

uni-axial

Piezo coefficient g32 Cpiezo,g32

0.02 Vm/N at 20 °C

uni-axial

Piezo coefficient g33 Cpiezo,g33

-0.15 Vm/N at 20 °C

uni-axial

Pyroelectric coefficient p

-27 μC/m²·K at 20 °C

uni-axial

Technological properties

Application areas

Fittings, bearings, linings and vessels (all especially for the chemical processing industry), wire insulation, piezo-electric devices

Other

Resistance to: Acids (Concentrated) Good, Acids (Dilute) Good, Alkalis Fair, Aromatic hydrocarbons Good, Greases and Oils Good, Halogenated Hydrocarbons Good to Fair, Halogens Good to Poor

This material data has been provided by Goodfellow.

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.