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Polyvinylidenefluoride (PVDF)

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

Electrical

Dielectric constant, 1MHz εr,1MHz

8.4 [-] at 20 °C

Dielectric strength EDS

13 kV/mm at 20 °C

Dissipation factor ε''

0.06 [-] at 20 °C

at 1kHz

Electrical resistivity ρel

1.00E+12 Ω·m at 20 °C

Sheet resistivity ρel,sheet

1.00E+13 Ω/sq at 20 °C

General

Density ρ

1.76 g/cm³ at 20 °C

Friction coefficient µ

0.2 - 0.4 [-]

Limiting oxygen index LOI

44 % at 20 °C

Water absorption, equilibrium cwater,equib

0.04 % at 20 °C

24h

Mechanical

Elastic modulus E

1 - 3 GPa at 20 °C

Elongation A

50 % at 20 °C

Poisson's ratio ν

0.34 [-] at 20 °C

Tensile strength Rm

25 - 60 MPa at 20 °C

Optical

Refractive index nd

1.42 [-]

Thermal

Coefficient of thermal expansion α

8E-5 - 1.4E-4 1/K at 20 °C

Flammability

UL 94 V-0

Heat deflection temperature HDT

80 - 115 °C

at 1.8MPa

Max service temperature Tmax

135 - 150 °C

Min service temperature Tmin

-40 °C

Thermal conductivity, transverse λtrans

0.1 - 0.25 W/(m·K) at 23 °C

Technological properties

Application areas

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

Other

Resitance 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

Radiation resistance

Fair

UV resistance

Excellent

Wear resistance

ASTM D1044 24mg/1000 cycles

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.