PVDF Kynar: High-Purity Fluoropolymer for Semiconductor, Chemical & Lithium-Ion Battery Applications
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).
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.
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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