
PVDF (PolyVinyliDene Fluoride)
PVDF Properties and Characteristics
PVDF is generally used in applications requiring the high purity, strength, and resistance to solvents, acids, bases and heat. Compared to other fluoropolymers, like PTFE, PFA, FEP, it has an easier melt process because of its relatively low melting point of around 177°C.
Material properties of fluoropolymers – A comparison
In general, the chemical resistance of these materials are superior to most other families of plastics. This “chemically inert” characteristic is closely allied to their superior performance in ultra pure environments. The chemical inertness varies between the fluoropolymers. The fully fluorinated resins such as PTFE, FEP, PFA and MFA exhibit chemical inertness to a wider range of chemicals than do the partially fluorinated polymers such as CTFE (or PCTFE) and ECTFE. A better property in one or two areas is accompanied by a diminished property in others (for example PTFE properties is better than PVDF in chemical resistance but it has lower mechanical properties at normal ambient temperatures. Fully fluorinated polymers (perfluoropolymers) such as PTFE, FEP and PFA offer better thermal (higher use temperature) and chemical resistance properties than their partially fluorinated counterparts like ECTFE or PCTFE. However, partially fluorinated resins posses better mechanical properties, such as tensile strength, toughness, abrasion and cut-through resistance at ambient temperatures.
The flex modulus of PVDF tubing is considerably higher than PTFE (relatively most flexible), FEP, PFA or MFA. This makes PVDF tubing considerably more rigid than the other materials; however it has higher tensile strength at ambient temperatures.
The selection of a resin for a specific use is based on criteria for that application; for example permeability at the use temperature may be a critical requirement and may override other features such as chemical resistance and tensile strength. In each case the choice of material is made by comparing the key property requirements and, of course, cost .
Maxiumn usage of temperatures for PVDF
Typical applications
Filtration and separation equipment (filters, housings), transport and storage systems, insulation on some kinds of electrical wires, circuit assembly and printed circuit ,board rework is PVDF-insulated, tactile sensor arrays, strain gauges and lightweight audio transducers.
Properties
Property | Value | Units | Method |
Tensile Strength, 73°F, at break | 5075 - 7250 35 - 50 |
psi MPa |
D 638 |
Elongation at break, 73°F | 20 - 50 | % | D 638 |
Flexural Strength, 73°F | 2100 11165 |
psi MPa |
D 790 |
Impact Strength, Izod, 23 deg C, notched, 4mm thick | 2.25 120 |
Ft-lbf/in J/m |
D 256 |
Yield StrengthAt 23 deg C | 7685 - 8265 53 - 57 |
psi MPa |
D 638 |
Density | 1.78 | gm/cu.cm | |
Coefficient of friction, static | 0.2 to 0.4 | D 1894 |
Property | Value | Units | Method |
Coefficient of Linear Expansion | 12 – 14 x 10-5 | K-1 | D 696 |
Melting Point | 343 173 |
deg F deg C |
D 3418 |
Thermal Conductivity | 1.39 0.2 |
Btu/hr-.ft-deg F watt/meter-K |
ASTM C 177 |
Specific Heat, at 300 deg K | 0.287 – 0.382 1.2 – 1.6 |
Btu/lb/deg F kJ/Kg/deg K |
|
Heat Distortion Temperature, 66 lb/sq.in (0.455 MPa), 4 mm thick |
293 145 |
deg F deg C |
D 648 |
Service Temperature | to 302 to 150 |
deg F deg C |
|
Processing Temperature | deg F deg C |
Property | Value | Units | Method |
Surface Arc-Resistance | sec | D 495 | |
Volume Resistivity | > 1014 | ohm-cm | D 257/DIN 53483 |
Surface Resistivity, @ 100% RH | > 1014 | Ohm sq-1 | D 257/DIN 53483 |
1MHz, 23 deg C | 7 | ε | D150-81 |
Property | Value | Units | Method |
Flame Rating+ | V-0 | Class | UL-94 |
Refractive Index | 1.41 – 1.42 | nD 25 | D 542 |
Limiting Oxygen Index | 44 | % Oxygen | D 2863 |
Water Absorption, 230 deg C, 10 Kg | < 0.04 | gm/10 min | D 1238 |
Specific Gravity | 1.78 | ISO 1183 |