PVDF Polyvinylidene Fluoride Board
Polyvinylidene Fluoride PVDF sheets Specification: Application: PVDF sheets are recommended for use (including as replacement of PTFE ) at a combination of the following factors: * item includes operation under the influence of strong corrosive substances, * and the operating temperature does...
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Product Introduction
PVDF Board - Heavy-Gauge Polyvinylidene Fluoride Stock for Machined Process Components
PVDF board is polyvinylidene fluoride supplied in heavy gauges - typically 3 mm to 50 mm - as flat stock for machining, welding and fabricating into chemical-process components. Where thin PVDF sheet is used to protect or line a surface, PVDF board is used to make the part itself: pump wear rings, valve bodies, tank baffles, scraper blades, insulating blocks and machined seal components.
Because PVDF combines the highest tensile strength and stiffness of any melt-processable fluoropolymer with near-universal resistance to acids, oxidisers and chlorinated media, it is the material specifiers reach for when a component must hold its shape under load, resist a corrosive service, and still be fabricated on ordinary metalworking equipment. Our board is compression-moulded from 100% virgin resin, stress-relieved before dispatch, and supplied with a batch-linked material certificate on request.
Typical lead time: 7 days for standard stock sizes · MOQ: from 100 kg per specification · Custom cut-to-size available
Board, Plate or Sheet? Choose by Thickness
The three names describe the same material at different gauges. Using the wrong one to search wastes time - and using thin sheet where thick board is required is a common cause of premature component failure.
| Product form | Typical thickness | Supplied as | Choose it for |
|---|---|---|---|
| PVDF board | 21 – 50 mm | Flat rectangular stock | Machined or welded structural parts; load-bearing and self-supporting components |
| PVDF plate | 6 – 20 mm | Flat stock | Medium-duty parts, backing plates, cut gaskets |
| PVDF sheet | 3 – 6 mm | Sheet / roll where applicable | Lining, cladding, tank protection, die-cut components |
| PVDF rod | Ø 8 – 100 mm | Round bar | Turned bushes, sleeves, small fittings |
Why Specifiers Choose PVDF Board for Machined Parts
1. It holds tolerance after machining. Unlike PTFE, which creeps under sustained load and relaxes out of tolerance, PVDF has excellent creep resistance and dimensional stability. A machined PVDF clearance ring or wear pad keeps its fit far longer under load and temperature.
2. It is the stiffest melt-processable fluoropolymer. Tensile strength of around 50 MPa and a flexural modulus near 2.1 GPa put PVDF ahead of PTFE and FEP mechanically. That is why PVDF is used for self-supporting components rather than only chemical barriers.
3. Board is stress-relieved before dispatch. Thick moulded stock carries internal stress. If it is machined without relief, the part can bow or crack after cutting. We anneal our board before it leaves the factory so it machines flat and stays flat.
4. It welds. PVDF board can be butt-welded, socket-welded and hot-gas welded with matching PVDF rod to build tanks, ducts and liners from flat stock - a capability PTFE does not offer. We supply the welding rod to match.
5. It shrugs off weathering and UV. PVDF parts stay outside for decades without chalking, embrittling or splitting. It is the same chemistry used for architectural façade coatings for this reason.
6. It is safe for food and pharma contact. PVDF is available in grades accepted for direct food contact, and it resists steam and CIP chemicals, making it a natural fit for pumps, chutes and filler components in hygienic plants.
Stock Formats and Thickness Tolerances
Standard stock sizes
| Width x Length | Thickness range | Availability |
|---|---|---|
| 500 x 500 mm | 6 – 100 mm | Stock |
| 1000 x 500 mm | 6 – 100 mm | Stock |
| 1000 x 1000 mm | 20 – 100 mm | Stock |
| 1200 x 1200 mm | 20 – 100 mm | Stock |
| 1000 x 2000 mm | 20 – 100 mm | Made to order |
| 2000 x 2000 mm | 20 – 100 mm | Made to order |
Board-grade thickness tolerance (typical)
| Nominal thickness | Tolerance |
|---|---|
| 20 – 40 mm | ± 0.50 mm |
| 40 – 60 mm | ± 0.80 mm |
| 60 – 100 mm | ± 1.00 mm |
Machining, Welding and Installation Notes
Before machining - stress relief Thick PVDF stock should be annealed before close-tolerance machining. Typical practice is to hold the board at approximately 135 – 140 °C for a period scaled to thickness, then cool slowly. Our standard board is already stress-relieved; if you are re-annealing after roughing, use your resin supplier's datasheet for the exact cycle. (Confirm the cycle against your grade's TDS before production.)
Machining
Use sharp, polished high-speed-steel or carbide tooling with positive rake and generous chip clearance. Dull tools generate heat and smear the surface.
Run high cutting speeds with low feed pressure, and use air blast or flood coolant to carry heat away.
Support the work fully and take light finishing passes - PVDF is softer than metal and will deflect if unsupported.
Drill oversize and allow clearance for thermal expansion when fastening (see below). Avoid over-torquing: PVDF will creep under sustained compressive load. Use a backing washer.
Welding PVDF board is routinely joined by hot-gas, butt and socket welding using PVDF welding rod. Match the rod grade to the board grade, cut a clean weld preparation, and use the correct temperature profile - see our PVDF welding rod and 3 mm welding wire pages for consumable selection.
Thermal expansion PVDF expands noticeably more than metals. Its coefficient of linear thermal expansion is approximately 12 – 14 × 10⁻⁵ K⁻¹, i.e. roughly 1.2 – 1.4 mm per metre for every 100 °C of temperature rise. Design slotted or oversized fixing holes and expansion gaps into any large panel that will see a wide temperature swing. (Confirm against your grade's datasheet.)
Chemical Resistance by Media
PVDF is outstanding in acids, oxidisers and halogens, but it is not universal - organic bases, amines, ketones and polar aprotic solvents attack it. Check the service medium before specifying.
| Service medium | Resistance | Notes |
|---|---|---|
| Hydrochloric acid, all concentrations | Excellent | Widest acid service window |
| Sulphuric acid, dilute to 50% | Excellent | - |
| Sulphuric acid, concentrated / fuming | Poor | Avoid; fuming sulphuric acid attacks PVDF |
| Nitric acid, up to 65% | Good | Fuming nitric acid not recommended |
| Sodium hydroxide, dilute, ambient | Good | Attack increases sharply with concentration and temperature |
| Strong alkalis / amines / ammonia (hot) | Poor | Organic bases degrade PVDF |
| Chlorine, hypochlorite, oxidisers | Excellent | Common in water treatment and bleaching |
| Seawater, brine | Excellent | - |
| Aliphatic hydrocarbons, alcohols, fuels | Excellent | - |
| Ketones (MEK, acetone), esters | Poor | Swelling and dissolution |
| Polar aprotic solvents (DMF, DMSO, NMP) | Poor | True solvents for PVDF |
| Ozone | Excellent | - |
Rating guide: Excellent = no significant attack in continuous service · Good = suitable with temperature/concentration limits · Poor = do not specify PVDF.
PVDF Board vs PTFE, PVC and PP
Most PVDF board enquiries come down to one question: why not PTFE, PVC or PP? Here is the honest comparison.
| Property | PVDF | PTFE | Rigid PVC | PP |
|---|---|---|---|---|
| Continuous service temperature | 150 °C | 260 °C | ~60 °C | ~100 °C |
| Tensile strength (typ.) | ~50 MPa | 25 – 35 MPa | ~50 MPa | 30 – 38 MPa |
| Flexural modulus (rigidity) | ~2.1 GPa | ~0.6 GPa | ~2.8 GPa | ~1.4 GPa |
| Creep / load bearing | Excellent | Poor | Good | Moderate |
| Chemical resistance | Excellent - except bases, ketones, polar solvents | Broadest of all | Good - not solvents | Good - not aromatics/oxidisers |
| UV / weathering | Excellent | Excellent | Moderate | Poor |
| Abrasion resistance | Good | Poor | Good | Fair |
| Weldable | Yes - easily | Poor | Yes | Yes |
| Relative cost | Medium | High | Low |
The short version: choose PVDF over PTFE when the part must carry load, hold tolerance, resist abrasion or be welded - and when 150 °C is enough. Choose PTFE above 150 °C. Choose PVC or PP only where the chemical environment is mild, because neither survives the aggressive service PVDF handles.
Applications by Industry
| Industry | Typical PVDF board components | Why PVDF |
|---|---|---|
| Chemical & petrochemical | Pump wear rings and impellers, valve bodies, tank baffles, pipe supports, sight-glass frames | Acid service + load bearing + weldability |
| Water & wastewater treatment | Weir plates, baffles, diffuser supports, scraper blades | Chlorine and hypochlorite resistance, no leaching |
| Semiconductor & electronics | Wet-bench fixtures, wafer carriers, fluid-handling manifolds and blocks | High purity, low extractables, dimensional stability |
| Food, dairy & pharmaceutical | Chute liners, cutting boards, filler and pump components, CIP-exposed parts | Food-contact grades, steam and CIP resistance |
| Pulp & paper / metal finishing | Pickling-line components, plating-bath fixtures, anodising racks | Acid and oxidiser resistance at temperature |
| Marine & offshore | Splash-zone pads, brackets, seawater-exposed structural parts | Seawater and UV resistance, no corrosion |
Applications by Industry
| Industry | Typical PVDF board components | Why PVDF |
|---|---|---|
| Chemical & petrochemical | Pump wear rings and impellers, valve bodies, tank baffles, pipe supports, sight-glass frames | Acid service + load bearing + weldability |
| Water & wastewater treatment | Weir plates, baffles, diffuser supports, scraper blades | Chlorine and hypochlorite resistance, no leaching |
| Semiconductor & electronics | Wet-bench fixtures, wafer carriers, fluid-handling manifolds and blocks | High purity, low extractables, dimensional stability |
| Food, dairy & pharmaceutical | Chute liners, cutting boards, filler and pump components, CIP-exposed parts | Food-contact grades, steam and CIP resistance |
| Pulp & paper / metal finishing | Pickling-line components, plating-bath fixtures, anodising racks | Acid and oxidiser resistance at temperature |
| Marine & offshore | Splash-zone pads, brackets, seawater-exposed structural parts | Seawater and UV resistance, no corrosion |
PVDF Board FAQ
What is the difference between PVDF board, plate and sheet?
It is thickness banding, not a different material. Board is the heavy gauge (20 – 100 mm) used for machined and welded parts; plate sits at 6 – 20 mm; sheet is 1 – 6 mm for lining and cladding. See the thickness table above to pick the right form.
What is the thickest PVDF board you can supply, and how big?
Up to 100 mm thick. Standard stock runs to 1200 x 1200 mm; 1000 x 2000 mm and 2000 x 2000 mm are made to order.
Can you machine finished components to my drawing?
Yes. Send a sample, a 2D/3D drawing (STP, STEP, X-T, PDF) or a photo with detailed dimensions. Your drawings are treated as confidential. MOQ for machined parts is negotiable.
Which grade should I specify - homopolymer or copolymer?
Choose homopolymer for maximum stiffness, tensile strength and chemical resistance. Choose copolymer where greater flexibility and impact resistance matter more than rigidity. Tell us the service conditions and we will recommend.
How do I weld PVDF board?
Hot-gas, butt and socket welding all work, using PVDF welding rod. Match rod grade to board grade. We supply the matching welding rod and 3 mm wire.
Is PVDF board suitable for outdoor use?
Yes. PVDF resists UV and weathering for decades without chalking or embrittling - it is the base chemistry of high-performance architectural façade coatings.
Is PVDF board food-contact approved?
Food-contact grades are available and FDA-approved grades are referenced in the industry. Confirm the requirement with us when ordering so the correct grade is supplied.
How much will my part expand at operating temperature?
Allow roughly 1.2 – 1.4 mm per metre for every 100 °C rise (CLTE ≈ 12 – 14 × 10⁻⁵ K⁻¹). Design slotted holes or expansion allowance into large panels.
What are your MOQ and lead times?
Standard specifications: MOQ from 100 kg, delivery about 7 days. Custom and machined specifications: MOQ negotiable, add 5 – 15 days.
Can I get a sample?
Yes. Small samples are available with express cost at our expense. We can also reverse-engineer from your sample and match material and dimensions.
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