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Polyvinylidenefluoride ( PVDF )

Material Information

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Bolt Film Granule Metallized Film Nut Rod Sheet Tube Washer
Bolt Film Granule Metallized Film Nut Rod Sheet Tube Washer

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Common Brand Names:
Floraflon, Kynar, Solef
 
General Description:  

General Description : A semi-crystalline, semi-opaque and white engineering thermoplastic that is melt processable and 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 ß 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 polarization at very high electrical fields. In practice, both uniaxial and biaxial mechanical orientation is used which, after poling, gives a different balance of piezo-/pyro-electric properties.

Applications of PVDF include pipes and fittings, bearings, linings and vessels (all especially for the chemical processing industry), wire insulation and piezo-electric devices.

   

Chemical Resistance

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

Electrical Properties

Dielectric constant @1MHz 8.4
Dielectric strength ( kV mm-1 ) 13
Dissipation factor @ 1kHz 0.06
Surface resistivity ( Ohm/sq ) 1013
Volume resistivity ( Ohmcm ) 1014

Mechanical Properties

Abrasive resistance - ASTM D1044 ( mg/1000 cycles ) 24
Coefficient of friction 0.2-0.4
Elongation at break ( % ) 50
Hardness - Rockwell R77-83
Izod impact strength ( J m-1 ) 120-320
Poisson's ratio 0.34
Tensile modulus ( GPa ) 1.0-3.0
Tensile strength ( MPa ) 25-60

Physical Properties

Density ( g cm-3 ) 1.76
Flammability V0
Limiting oxygen index ( % ) 44
Radiation resistance Fair
Refractive index 1.42
Resistance to Ultra-violet Excellent
Water absorption - over 24 hours ( % ) 0.04

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 80-140
Heat-deflection temperature - 0.45MPa ( C ) 120-150
Heat-deflection temperature - 1.8MPa ( C ) 80-115
Lower working temperature ( C ) -40
Thermal conductivity @23C ( W m-1 K-1 ) 0.1-0.25
Upper working temperature ( C ) 135-150

Properties for Polyvinylidenefluoride Film

Property Value
Material Uni-axial Bi-axial Unoriented
Dielectric Constant @ 1MHz 12 @ 1KHz 11 @ 1KHz
Dielectric Strength @25µm thick kV mm-1 ~160
Dissipation Factor @1MHz 0.018 @ 1KHz
Extension to break - Longitudinal % 14-20 50
Extension to break - Transverse % 300-450 50
Heat-sealing Temperature C 204-218
Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.2
Permeability to Hydrogen @0C x10-13 cm3. cm cm-2 s-1 Pa-1 0.25
Permeability to Hydrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.25
Permeability to Nitrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.03
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.03
Permeability to Water @38C x10-13 cm3. cm cm-2 s-1 Pa-1 250
Piezo coefficient - d31 pC.N-1 18-20 8
Piezo coefficient - d32 pC.N-1 2 8
Piezo coefficient - d33 pC.N-1 ~-20 15-16
Piezo coefficient - d3h pC.N-1 -6.5
Piezo coefficient - g31 Vm.N-1 0.15
Piezo coefficient - g32 Vm.N-1 0.015
Piezo coefficient - g33 Vm.N-1 ~-0.15 ~0.18
Pyro coefficient - 3 µC m-2 K-1 -27 ~25
Shrinkage % 2.5-25 2
Tensile modulus - Longitudinal GPa 1.8-2.7 2
Tensile modulus - Transverse GPa 1.7-2.7 2
Tensile strength - Longitudinal MPa 180-290 180
Tensile strength - Transverse MPa 29-38 180
Volume Resistivity Ohmcm 1.8x1015 5x1014

Buy Polyvinylidenefluoride on-line

We stock and supply the following standard forms:
Bolt Film Granule Metallized Film Nut Rod Sheet Tube Washer
Bolt Film Granule Metallized Film Nut Rod Sheet Tube Washer

Choose a form to search our on-line catalog  

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