PVDF Kynar: Properties, Uses & Cost Guide
Tensile data verified against MatWeb.com database & manufacturer datasheets · Last updated July 2026
Published: 2026-05-31
Polyvinylidene fluoride (PVDF) is a specialty fluoropolymer that occupies a unique position: it offers significantly better mechanical properties and easier melt-processability than PTFE while retaining excellent chemical resistance to acids,...
Polyvinylidene fluoride (PVDF) is a specialty fluoropolymer that occupies a unique position: it offers significantly better mechanical properties and easier melt-processability than PTFE while retaining excellent chemical resistance to acids, halogens, and hydrocarbons. PVDF is the material of choice for ultra-high-purity (UHP) water distribution piping in semiconductor fabs, chemical storage tanks, lithium-ion battery binders (NMP/PVDF slurry coating cathode/anode powders onto current collectors), and architectural coatings (40+ year exterior weatherability on aluminum composite panels).
PVDF is semi-crystalline (35-65% crystallinity depending on cooling rate) and readily processed by injection molding, extrusion, and compression molding at 200-260°C melt temperature. It requires corrosion-resistant tooling (stainless steel molds, chrome-plated screws and barrels) due to HF release at processing temperatures. PVDF homopolymer provides the highest strength and stiffness; PVDF copolymer (with HFP or CTFE) offers improved flexibility and impact resistance at the expense of ~10-15% lower tensile properties.
Key grades include Kynar 740 (homopolymer, highest purity for semiconductor), Kynar Flex 2800 (copolymer, improved impact for chemical piping subject to water hammer), and Solef 6010 (high-purity homopolymer for lithium-ion battery binder with controlled molecular weight distribution for NMP slurry viscosity optimization).
Recommended Applications
PVDF Kynar is commonly specified for:
⚠ Not Recommended For
PVDF Kynar is not recommended for:
- Continuous service above 150°C (use PFA or PTFE for higher temperature chemical service)
- Aromatic amine and concentrated sulfuric acid environments (PVDF swells or degrades)
- Flexural fatigue applications (PVDF has limited fatigue life compared to ETFE)
Selection & Application Guide
PVDF (Kynar) is the cost-effective fluoropolymer choice when you need chemical resistance and purity between PTFE and commodity plastics. Choose PVDF over PTFE when injection molding capability and mechanical strength are required; over PFA when cost sensitivity is paramount and 150°C service temperature is sufficient. PVDF's combination of purity, chemical resistance, and processability makes it the standard for semiconductor, pharmaceutical, and lithium-ion battery applications.
Real-World Applications
PVDF's exceptional purity (low extractables), chemical resistance, and weldability make it standard for UPW distribution systems in semiconductor fabs.
PVDF is the dominant binder material for lithium-ion battery cathodes due to its electrochemical stability, adhesion to current collectors, and compatibility with battery electrolytes.
PVDF sheet lining provides chemical resistance to halogens, strong acids, and oxidizers at temperatures up to 140°C in chemical storage and processing tanks.
PVDF meets USP Class VI and FDA requirements for pharmaceutical process piping, offering purity and cleanability superior to commodity plastics.
Processing & Cost Considerations
Manufacturing Tips
- PVDF processes at 220-260°C melt temperature with mold temperatures of 60-90°C — much lower than PEEK or PPS, achievable on standard injection molding machines. This is a major advantage over PTFE (not moldable) and PFA (requires 340-380°C).
- PVDF's low shrinkage (1.5-2.5%) and good dimensional stability produce parts with tight tolerances. It has excellent flow characteristics that allow molding of thin-wall components for fluid handling systems.
- PVDF can be welded by contact (hot plate), butt fusion, and electrofusion — essential for piping system assembly. Weld strength reaches 90%+ of parent material strength when proper procedures are followed.
PVDF costs $20-50/kg — significantly less than PFA ($50-100/kg) and PTFE ($25-60/kg plus compression molding cost). PVDF's injection moldability reduces processing costs compared to PTFE. For semiconductor and pharmaceutical applications, PVDF provides the best cost-performance ratio among pure fluoropolymers. The total installed cost of PVDF piping systems is often lower than stainless steel in corrosive service.
Technical Properties
| Density | 1.78 g/cm³ |
|---|---|
| Tensile Strength | 50 MPa |
| Melting Point | 170-175 °C |
| Shrinkage Rate | 2.5% |
| Flexural Modulus | 2.4 GPa |
| Hdt | 112 °C at 1.82 MPa |
| Continuous Service Temp | 150 °C |
Engineering Tool: Shrinkage & Cost Estimator
Calculate part weight, mold cavity dimensions accounting for shrinkage, and material cost — all locally in your browser.
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| Arkema Kynar | |
| Solvay Solef | |
| Kureha KF Polymer |
Frequently Asked Questions
How does PVDF compare to PTFE for chemical resistance?
PTFE has superior chemical resistance overall (resistant to virtually everything except molten alkali metals and fluorine gas at high temperature), but PVDF offers: (1) 2-3× higher tensile strength (50 MPa vs 20-30 MPa) enabling self-supporting piping without continuous support; (2) melt-processability — PVDF can be injection-molded and extruded on standard fluoropolymer-grade equipment, while PTFE cannot be melt-processed and requires cold-compression-and-sinter powder metallurgy; (3) lower permeability to small molecules (H₂, He, CO₂) making it preferred for high-purity gas distribution. PTFE is specified where PVDF's chemical resistance is inadequate — specifically hot concentrated sulfuric acid (>93% at >60°C), fuming nitric acid, and certain polar organic solvents (acetone, MEK) that swell PVDF.
How does PVDF compare to PTFE for chemical resistance?
PVDF has good chemical resistance to halogens, acids, and oxidizers, but PTFE is essentially inert to all chemicals. PVDF is attacked by strong bases (concentrated NaOH), polar solvents (acetone, esters), and fuming sulfuric acid. PTFE resists all of these. Choose PVDF when your chemical environment is compatible and moldability/cost matter; choose PTFE for universal chemical resistance.
Is PVDF suitable for food contact?
Yes. PVDF complies with FDA 21 CFR 177.2600 for repeated food contact and is 3-A sanitary standard compliant for dairy and food processing equipment. Its non-porous surface provides excellent cleanability and resistance to CIP (clean-in-place) chemicals.
What is the difference between homopolymer and copolymer PVDF?
Homopolymer PVDF (Kynar 700 series) offers higher stiffness, tensile strength, and chemical resistance. Copolymer PVDF (Kynar Flex, Kynar Superflex) provides better impact strength, flexibility, and stress crack resistance. Choose homopolymer for rigid piping and tank linings; copolymer for flexible tubing and linings requiring crack resistance.
Can PVDF be used for high-purity semiconductor applications?
Yes. PVDF is one of the few polymers certified for semiconductor ultra-pure water (UPW) and chemical distribution systems. Specific grades like Kynar HF (high-purity) have extractable levels below 1 ppb after proper passivation. PVDF outperforms PP and PV piping in purity and temperature capability.
What makes PVDF suitable for lithium-ion batteries?
PVDF's electrochemical stability window (0-5V vs Li/Li+), strong adhesion to aluminum current collectors, and compatibility with common electrolyte solvents (NMP, DMAC) make it the dominant cathode binder. It accounts for approximately 90% of the lithium-ion battery binder market.
Related Diagnostics & Materials
PEEK Polyetheretherketone: High-Performance Polymer...
Polyetheretherketone (PEEK) is a colorless organic thermoplastic polymer in the polyaryletherketone (PAEK) family,...
Ultem PEI (Polyetherimide): High-Temperature Amorphous...
Polyetherimide (PEI), best known by Sabic's trade name Ultem, is an amorphous high-performance thermoplastic...
PTFE Teflon: Ultimate Chemical Resistance & Low-Friction...
Polytetrafluoroethylene (PTFE), widely known by the trade name Teflon, is a fluoropolymer with the lowest...
PPS Ryton: Polyphenylene Sulfide High-Temp...
Polyphenylene sulfide (PPS), best known by Solvay's trade name Ryton, is a semicrystalline high-performance...
LCP Vectra: Liquid Crystal Polymer for Micro-Molding &...
Liquid Crystal Polymer (LCP), best known by Celanese's trade name Vectra, is a unique class of thermotropic...
Vespel Polyimide: Extreme-Temperature Polymer for...
Polyimide (PI), commercially known as DuPont Vespel, is the highest-temperature-rated polymer commercially...
PAI Torlon: Polyamide-Imide Extreme-Performance Polymer...
Polyamide-imide (PAI), commercially known as Solvay Torlon, occupies the performance space between PEEK and...
PES Veradel: Polyethersulfone Transparent High-Temp...
Polyethersulfone (PES), commercially known as Solvay Veradel or BASF Ultrason E, is an amorphous high-temperature...
References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org