What is Expanded PTFE Sheet?
Material & manufacturing summary
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ePTFE is produced by expanding 100% virgin PTFE into a highly fibrillated microstructure that gives multi-directional strength, compressibility and sealing ability distinct from standard (solid) PTFE sheet.
Key technical highlights
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100% virgin, multi-directionally expanded PTFE.
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Temperature range (typical): approx. -240°C to +260°C (≈ -400°F to +500°F) depending on grade.
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Chemical resistance: stable across pH 0–14 for virtually all common media (except molten alkali metals and elemental fluorine).
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Low cold flow and high creep resistance compared with conventional PTFE.
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FDA / food-contact compatible grades available for hygienic applications.
Why choose expanded PTFE sheets?
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Superior conformability — seals irregular flanges, glass-lined and corroded surfaces with low bolt load.
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Broad chemical compatibility — suitable for acids, alkalis, solvents; ideal for chemical, petrochemical, pharma and food industries.
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Low creep / long life — reduced re-torque and longer service intervals vs some softer fillers.
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Clean & inert — non-toxic, non-contaminating (good for hygienic / pharma uses).
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Customizable — cut-to-size, skived thickness, filled variants on request.
Common applications
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Chemical & petrochemical processing (acid/alkali lines, exchangers).
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Food & beverage / pharmaceutical (food-grade sheets, hygienic seals).
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Power generation / heat exchangers / reactors.
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Marine, desalination, pulp & paper, semiconductor processing.
Technical specifications
| Attribute | Typical Value / Range |
|---|---|
| Material | 100% virgin expanded PTFE (ePTFE) |
| Thickness | 0.5 mm – 10 mm (custom skiving available) |
| Standard sheet size | 1500 mm × 1500 mm (60″ × 60″) or 1000×1000, cut-to-size available. |
| Density / Specific gravity | 0.5–1.0 g/cm³(grade dependent) |
| Temperature range | -240°C – 260°C (-400°F to +500°F) (grade dependent). |
| pH compatibility | 0–14 (universal resistance to common chemicals). |
| Certification examples | FDA, USP-VI (where applicable), RoHS (depending on grade) |
| Colour | Natural (white/cream) — fillers/pigments by request |
Typical / common sizes & variants
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Full expanded teflon sheets: 60″ × 60″ (1524 × 1524 mm), 48″ × 48″, 1000 × 1000 mm.
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Thicknesses: 0.5 mm, 1 mm, 1.5 mm, 2 mm, 3 mm, 5 mm, 8 mm, 10 mm (many suppliers offer custom skiving).
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Custom services: die-cut gaskets, CNC cutting, reinforcement (aramid/metal insert) and filled options for improved compressive strength.
Advantages vs other common gasket materials
| Feature | Expanded PTFE (ePTFE) | Solid PTFE sheet | Graphite | Compressed non-asbestos |
|---|---|---|---|---|
| Chemical resistance | Excellent (pH 0–14). | Excellent | Good (but sulfuric/nitric issues) | Variable |
| Conformability / sealing irregular flanges | Very high | Low–medium | Medium | Medium |
| Cold flow / creep | Low (improved vs solid PTFE) | Higher cold flow | Low | Medium–high |
| Temperature capability | ~ -240°C–260°C | Similar upper temp | Higher maximum (graphite) | Depends on grade |
| Clean / food-grade possible | Yes (FDA grades) | Yes | No (contamination risk) | Depends |
FAQ
Q: What are your MOQ and sample policy?
A: Samples: typically 1–3 small cut samples available for testing (may be free or charged depending on grade/shipping). Bulk MOQ: usually negotiable — many standard stocked sheet sizes can be ordered from 1 sheet upward; custom formulations/large pallet orders may have MOQ (100–500 kg). Confirm at quote stage.
Q: Typical lead time?
A: For stocked grades: 3–7 working days for small orders; custom cuts or non-stock grades: 2–6 weeks depending on volume and finishing. Provide expedited options.
Q: Shipping methods & international logistics?
A: We ship samples via express courier (DHL/UPS/FedEx). Bulk orders ship by express pallet, LCL or FCL, CIF/FOB as requested. Provide estimated transit times per region at quote stage.
Q: Do you provide cut-to-size & die-cut gaskets?
A: Yes — CNC, die-cut, waterjet, and slitting services available; upload DXF or specify ID/OD and we’ll quote.
Q: Can you supply FDA/food-grade or USP-VI certified ePTFE?
A: Yes — we offer grades with documented compliance; TDS / certificate available on request.
Q: How to store & install expanded PTFE sheet gaskets?
A: Store flat in original packaging, avoid UV prolonged exposure; install with proper gasket surface cleaning, use recommended torque and avoid over-compression.
