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Material Types and Specification System
| Type | Molecular Weight/Characteristics | Typical Thickness Range (mm) | Width × Length (mm） | Main Production Method | Main Application Areas |
| General Grade (Natural/Dark Grey) | Standard molecular weight, crystallinity 60-65% | 1 - 100 | 1000×2000 / 1220×2440 | Extrusion | Chemical storage tanks, pump/valve linings, seals, piping systems |
| High Purity Grade | Ultra-low metal ion residue, no additives | 3 - 50 | 1000×2000 / Custom | Extrusion (Clean environment) | Semiconductor wafer carriers, cleaning tanks, high-purity fluid connectors |
| Antistatic/Conductive Type | Carbon fiber/CNT filled, surface resistance 10³-10⁶ Ω | 2 - 30 | 1000×2000 | Extrusion/Compression | Explosion-proof tools, electronic production line fixtures, semiconductor trays |
| Lithium Battery Grade | Specialized formulation, excellent adhesion & electrochemical stability | Film/Coating | Rolls | Coating/Casting | Lithium-ion battery electrode binder, separator coating |
| Piezoelectric Film Grade | High β-phase content, poled | 0.02 - 0.5 | Rolls | Casting + Stretching + Poling | Sensors, hydrophones, energy harvesting devices |
Technical Parameters and Performance Indicators
Physical & Mechanical Properties
| Property | Typical Value/Range | Test Standard/Reference |
| Density (g/cm³) | 1.75 – 1.79 | ISO 1183 / ASTM D792 |
| Tensile Strength (Yield, MPa) | 45 – 55 | ISO 527 / ASTM D638 |
| Elongation at Break (%) | 25 – 80 | ISO 527 / ASTM D638 |
| Tensile Modulus of Elasticity (MPa) | 2000 – 2400 | ISO 527 |
| Flexural Strength (MPa) | 70 – 85 | ISO 178 |
| Impact Strength (Notched, kJ/m²) | 15 – 25 | ISO 179 |
| Shore Hardness (D) | 75 – 80 | ISO 868 / ASTM D2240 |
| Water Absorption (24h, %) | 0.02 – 0.05 | ISO 62 / ASTM D570 |
Thermal & Electrical Properties
| Property | Typical Value/Range | Test Standard/Reference |
| Melting Point (℃) | 165 – 175 | ISO 11357-3 / ASTM D3418 |
| Glass Transition Temp (Tg, ℃) | -35 – -30 | DMA |
| Long-term Service Temp (Air, ℃) | -60 to 150 | — |
| Heat Deflection Temp (1.8MPa, ℃) | 100 – 110 | ISO 75 |
| Vicat Softening Temperature (℃) | 140 – 150 | ISO 306 |
| Coefficient of Linear Expansion (10⁻⁵/K) | 10 – 14 | DIN 53752 |
| Thermal Conductivity (W/m·K) | 0.13 – 0.20 | DIN 52612 |
| Dielectric Strength (kV/mm) | 20 – 25 | IEC 60243 |
| Volume Resistivity (Ω·cm) | > 10¹⁴ | IEC 60093 |
| Dielectric Constant (1MHz) | 6.5 – 8.0 | IEC 60250 |
| Dissipation Factor (1MHz) | 0.015 – 0.020 | IEC 60250 |
| Comparative Tracking Index (CTI) | > 600 | IEC 60112 |
| Flammability Rating | V-0 (3mm/6mm) | UL 94 |
Typical Application Areas
| Application Field | Specific Uses | Recommended Type | Key Requirements |
| Semiconductor | Wafer carriers, cleaning tanks, cassettes, high-purity water pipes, CMP components | High Purity Grade | Extremely low metal ion leaching, acid/alkali resistance, high-temperature resistance |
| Chemical Anti-Corrosion | Storage tank/reactor linings, chemical pipes, pump/valve bodies, gaskets | General Grade | Chemical corrosion resistance, hydrolysis resistance, weldable |
| Water Treatment | UF/MF membrane modules, MBR membrane supports, pure water delivery pipes | General/High Purity | Chlorine oxidation resistance, anti-fouling, long-term stability |
| New Energy | Lithium-ion battery electrode binder, separator coating, solar backsheet film | Lithium Battery Grade | Electrochemical stability, adhesion, weather resistance |
| Construction & Building | Architectural curtain wall fluorocarbon coatings, roofing membranes, outdoor signage | Grade (Powder/Emulsion) | Superb weather resistance, UV resistance, color/gloss retention |
| Food & Pharmaceutical | Food conveyor belts, pharmaceutical equipment components, pure water system fittings | General/Food Grade | Non-toxic, odorless, FDA compliant, easy to clean |
| Electronics & Electrical | Wire/cable jackets, piezoelectric sensors, audio diaphragms, capacitor dielectric | Piezo Film/General Grade | Insulation, piezoelectricity, flame retardancy |
| Nuclear & Military | Nuclear waste treatment equipment, radiation-resistant seals, specialty cable jackets | High Purity Grade | Gamma radiation resistance, low leaching, corrosion resistance |
Processing, Joining, and Installation Guide
1. Machining
- Turning/Milling: Use high-speed steel or carbide tools; tools must be kept sharp. Recommended cutting speed 200-400 m/min, feed rate 0.1-0.3 mm/rev. Adequate cooling is required (air cooling or water-based coolant recommended) to prevent local overheating above 150°C, which could cause melting or thermal deformation.
- Drilling: Use standard high-speed steel drills with a point angle of 118°. Use a peck drilling cycle (2-3mm per peck) for chip removal; compressed air can be used for cooling. The drilled hole diameter should be 0.1-0.2mm larger than the required final size to compensate for material shrinkage.
- Sawing: Band saws or circular saws are suitable. Use coarse, wide-set teeth for good chip clearance.
2. Joining and Assembly
- Hot Gas Welding: The most reliable method for joining PVDF sheets. Use a hot air gun (temperature 350-400°C) or extrusion welder with filler rods made of the same PVDF material. Weld strength can reach over 85% of the parent material.
- Solvent Bonding: PVDF is inert to common solvents, making bonding difficult. In special cases, surface treatment (e.g., sodium etching, plasma treatment) followed by specialized epoxy or polyurethane adhesives can be used.
- Mechanical Fastening: Bolts or screws can be used. Due to PVDF's high thermal expansion coefficient, expansion gaps should be considered in the design.
3. Heat Treatment and Stress Relief
- For large thickness (>30mm) or high-precision components, annealing after rough machining is recommended: hold at 120-140°C in an oven for 2-4 hours (add 1 hour per 10mm of thickness), then cool slowly to room temperature in the oven. This helps eliminate internal stresses, preventing deformation or cracking during subsequent use.
4. Installation Points
- Thermal Expansion Compensation: PVDF has a relatively high coefficient of linear expansion (~120 × 10⁻⁶/K). For long pipelines or large sheets, expansion joints or gaps must be provided.
- Liner Installation: When used as a lining for steel equipment, ensure the inner wall of the steel shell is smooth and flat, and use reliable adhesive or anchoring structures to prevent liner delamination under negative pressure.
Selection Decision Matrix
| Application Scenario | Primary Performance Requirement | Recommended Grade | Key Considerations |
| Semiconductor Wet Etching Bath | Ultra-pure, resistant to strong acids/oxidants | High Purity Grade | Request ICP-MS ion leaching report from supplier; confirm no additives |
| Chemical High-Temp Acid Storage Tank | High-temperature resistance, chemical resistance | General Grade | Verify long-term service temperature ≤ 140°C; design for thermal expansion |
| Outdoor Building Curtain Wall Coating | Superb weather resistance, color/gloss retention | Coating Grade (PVDF Resin) | Must contain ≥ 70% PVDF resin; pass outdoor weathering tests |
| Lithium Battery Electrode Binder | Electrochemical stability, strong adhesion | Lithium Battery Grade (e.g., 5130) | Match with NMP solvent system; moderate molecular weight; good dispersibility |
| Piezoelectric Sensor | igh piezoelectric constant, flexibility | Piezoelectric Film Grade (β-phase) | Confirm poling treatment; provide piezoelectric constant d₃₃ value |
| Pure Water Delivery Pipe | Purity, hydrolysis resistance, bacteriostatic | High Purity Grade | Smooth inner wall; comply with NSF/ISO hygiene standards |
Industry Customized Solutions
300mm Wafer Wet Cleaning Bath
Requirement: Resist strong acid/alkali cleaning solutions like SC1 (NH₄OH/H₂O₂) and SC2 (HCl/H₂O₂), no metal ion leaching, no deformation over long-term use.
Solution: Fabricate the entire tank from 20-30mm thick high-purity PVDF sheets using hot gas welding. All internal corners are radiused to minimize residue, and surfaces are polished to Ra ≤ 0.8μm. Welds are 100% visually inspected and spark tested.
Application: 300mm wafer wet cleaning equipment, replacing imported PFA-lined solutions.
Spray Pipes for Coal-Fired Power Plant Flue Gas Desulfurization (FGD) Systems
Requirement: Resist corrosion from high-temperature (60-80°C) dilute sulfuric acid slurry, resist abrasion, no aging during long-term outdoor use.
Solution: Roll and weld PVDF extruded sheets into large-diameter pipes, optionally lined with wear-resistant ceramics. Utilizing PVDF's excellent weather resistance, pipes can be installed outdoors without additional anti-corrosion coatings.
Application: Spray layers and circulation pipes in wet desulfurization towers.
Lithium Battery Slurry Preparation System
Requirement: Long-term stability in NMP (N-Methyl-2-pyrrolidone) solvent environment, no metal contamination, prevent slurry gelation.
Solution: All components contacting the slurry (mixing tank liners, pipes, valves) are made of high-purity PVDF, completely eliminating metal ion contamination. Connections use PVDF welding rods or PFA seals.
Application: Cathode slurry preparation systems, NMP recovery lines.
Housings for Deep-Sea Detector Buoyancy Modules
Requirement: Withstand deep-sea high pressure (hundreds of atmospheres), resist seawater corrosion, low water absorption, long-term reliability.
Solution: Machine thick-walled PVDF sheets into housings using CNC, filled internally with high-strength buoyancy foam. PVDF's low water absorption rate (<0.05%) ensures buoyancy stability in deep-sea environments.
Application: Deep-sea submersible buoys, underwater gliders.
Storage and Maintenance
Storage Conditions
Environment: Store in a cool, dry warehouse away from direct sunlight. Prolonged UV exposure, while not causing rapid degradation, may affect surface color.
Placement: Sheets should be stored flat on level pallets or platforms to prevent bending deformation from long-term unsupported stacking. Stacking height should not exceed 1 meter to prevent deformation of bottom sheets.
Shelf Life: PVDF is chemically stable with no significant aging during storage. However, for sheets stored long-term (over 5 years), it is advisable to retest mechanical properties before critical use.
Usage and Maintenance
Cleaning: General dirt can be cleaned with mild detergent and a soft cloth. For stubborn stains, alcohol or isopropyl alcohol can be used. Avoid cleaning with ketone solvents such as acetone or methyl ethyl ketone, as these can cause swelling or even dissolution of the PVDF surface.
Repair: Superficial scratches can be repaired by sanding with fine-grit sandpaper or polishing. Deep cracks or through-penetration damage are usually irreparable; component replacement is recommended.
Welding Repair: For localized cracks in tanks or pipes, repair using hot gas welding with PVDF filler rods of the same material.
Static Dissipation: PVDF components used in cleanrooms or explosive environments may accumulate static electricity due to friction. Use antistatic cleaners or choose antistatic modified grades.
Development Trends
Technology Development Directions
Pushing Purity Limits: Advancing towards ppt (10⁻¹²) level metal ion content to meet the ultimate purity requirements of semiconductor equipment for 3nm and below process nodes.
Copolymer Development and Application Expansion: Copolymers like PVDF-HFP (Hexafluoropropylene copolymer) and PVDF-CTFE (Chlorotrifluoroethylene copolymer) further optimize flexibility, low-temperature performance, and solubility, expanding applications in areas like gel electrolytes and flexible sensors.
Functional Compounding: Developing modified PVDF composites with enhanced properties such as high thermal conductivity (filled with graphene/BN), electromagnetic shielding (filled with CNT/graphene), and high dielectric constant to meet demands in high-end fields like 5G communication and new energy vehicles.
Green Manufacturing and Recycling: Exploring bio-based PVDF synthesis routes; researching physical recycling and chemical depolymerization technologies for PVDF waste to achieve material circularity and reduce environmental footprint.
Market Application Expansion
Hydrogen Energy: Utilizing PVDF's chemical resistance and barrier properties to develop diaphragm frames for alkaline water electrolysis for hydrogen production, and liner materials for hydrogen storage tanks.
Solid-State Batteries: PVDF-based solid polymer electrolytes and composite solid electrolytes are hot research topics for high-safety, high-energy-density solid-state batteries.
Wearable Electronics: The flexibility and energy harvesting characteristics of PVDF piezoelectric films offer broad prospects in self-powered wearable sensors, flexible touch screens, etc.
Aerospace Lightweighting: Continuous carbon fiber reinforced PVDF thermoplastic composites combine light weight, high strength, and excellent environmental resistance, suitable for aircraft interior parts and structural components.
Conclusion
As a model of "rigidity and toughness balance" within the fluoroplastic family, PVDF sheet, with its ultimate purity, highest mechanical strength among fluoroplastics, excellent weather resistance, and unique piezoelectric functionality, has established an irreplaceable position in strategic emerging industries such as semiconductors, chemicals, new energy, and electronics. It serves as both the "pristine container" safeguarding wafer purity in semiconductor manufacturing and the "critical link" driving energy storage in the new lithium battery era, as well as the "sensitive nerve" perceiving subtle signals in the field of smart sensing. Driven by the dual forces of domestic substitution and the upgrade of high-end manufacturing, PVDF is rapidly advancing from traditional anti-corrosion structural materials into cutting-edge fields like new energy, flexible electronics, and green hydrogen. Correct grade selection, precise processing technology control (especially thermal management and stress relief), and lifecycle maintenance management are the three key technologies to unlocking the potential of PVDF materials.
