Kaxite Sealing manufactures Expanded PTFE (ePTFE) in sheet, tape, cord and filament forms for high-performance sealing, filtration and electrical insulation. We produce virgin ePTFE with a microporous node-and-fibril structure — softer, more conformable and more creep-resistant than skived PTFE. Procurement teams choose us for factory-direct pricing, documented material traceability and 7–15 day lead times on bulk orders.
ePTFE is created by stretching PTFE under controlled conditions, forming a network of fine nodes connected by fibrils. This makes the material soft, flexible and highly compressible — while retaining full chemical inertness across pH 0–14.
ePTFE recovers up to 80% of its compressed thickness, so bolted flange joints stay tight through thermal cycles and vibration. Where solid PTFE cold-flows and leaks, ePTFE keeps sealing with far lower bolt loads.
Kaxite ePTFE contains no fillers, binders or additives — identical chemical purity to virgin PTFE. Compliant with FDA 21 CFR 177.1550, USP Class VI and EU 10/2011 for food, pharmaceutical and WFI service.
Highly compressible and pliable. Fills grooves, scratches and pitted surfaces. Best for uneven, warped or low-pressure flange faces, and for valve stem and pump packing where flexibility matters most.
Balances conformability with load-bearing capacity. The default choice for most standard pipe flanges, heat exchangers and vessel manways across chemical, oil and gas, food and pharmaceutical service.
Impregnated or compressed ePTFE with minimal creep and high bolt-load retention. Specified for high-pressure, high-temperature and blow-out-resistant flanges in aggressive media service.
Industrial-grade thread sealant for gas lines, chemical processing, LNG, hydrogen and petrochemical service. Gas pressure up to 30 bar, liquid up to 150 bar. Certified to DVGW, AGA, BS EN 751-3, NSF-61, WRAS, FDA 21 CFR 177.1550, RoHS and REACH.
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100% virgin PTFE thread seal tape for water, gas, hydraulic and pneumatic systems. Gas pressure up to 20 bar, liquid up to 100 bar. Colour-coded options for gas (yellow), drinking water (green) and food-grade (pink) service with FDA, NSF-61 and WRAS certification.
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Wide-format roll of 100% virgin ePTFE for large flanges, vessel shells, manhole covers and heat exchanger heads. Service range -268 °C to +260 °C, vacuum to 200 bar. A single roll replaces dozens of pre-cut gaskets — cut on site to fit any flange circumference.
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Premium sealing solution for pipes and joints with a self-adhesive backing. High-temperature resistance and long-lasting performance for plumbing, HVAC and automotive repair. Easy to apply, flexible, and reliably leak-proof where rigid alternatives fail.
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Form-In-Place gasket material made from 100% expanded PTFE with a self-adhesive strip on one face. Contains no fillers and no binders — same chemical inertness as pure virgin PTFE. Conforms to rough, pitted, scratched and damaged flange surfaces and glass-lined or enamel sealing surfaces.
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Form-In-Place gasket tape with a peel-off backing that holds in position on both horizontal and vertical flanges. The two ends cross to form a complete sealing ring in place. Resists creep and cold flow, shows no age deterioration, and has unlimited shelf life.
View specifications| Product Form | Thickness | Density | Width / Diameter | Typical Applications |
|---|---|---|---|---|
| ePTFE Sheet | 0.5 – 6.0 mm | 0.4 – 0.8 g/cm³ | Up to 1500 mm wide | Gaskets, diaphragm seals, flange liners |
| ePTFE Tape (Skived) | 0.1 – 1.0 mm | 0.6 – 0.8 g/cm³ | 12 / 25 / 50 / 100 mm | Thread sealant, pipe wrapping, wound gaskets |
| ePTFE Cord | — | 0.4 – 0.6 g/cm³ | 3 / 5 / 8 / 10 mm | Pump packing, valve stem packing, in-situ gasketing |
| ePTFE Filament / Fiber | — | — | 100 – 3000 Denier | Filtration media, composites, braided packing |
| Impregnated ePTFE Sheet | 1.0 – 5.0 mm | 1.2 – 1.8 g/cm³ | Up to 1000 mm wide | High-stress bolted flange connections |
ePTFE is the material of choice wherever a solid PTFE gasket cannot bridge rough, pitted or irregular flange faces, or where low bolt loads and thermal cycling demand a material that recovers rather than cold-flows. Common finished forms include expanded PTFE gaskets, joint sealant tape, braided packing and filtration media.
MOQ negotiable for trial and prototype orders. Free cut samples of standard sheet, tape and cord forms available for material evaluation before bulk purchase.
7–15 days for standard products; longer for custom widths, densities or impregnated grades. FOB Ningbo / Shanghai, CIF and DDP terms available. Coiled, sheet or spool packaging for sea and air freight.
Inspection report with every shipment. Third-party testing (SGS, TÜV) on request. FDA 21 CFR 177.1550, USP Class VI, EU 10/2011, RoHS and REACH documentation with full traceability from resin lot to finished roll.
Traditional skived PTFE is a solid, non-porous material. Expanded PTFE undergoes a controlled expansion process that creates a microporous structure of nodes interconnected by fibrils. This gives ePTFE dramatically improved flexibility, conformability, tensile strength and compressibility — while keeping the full chemical and thermal resistance of PTFE. It is softer, more pliable, and seals at much lower bolt loads.
Yes, but selection is critical. Lower-density ePTFE cords and tapes excel in dynamic service such as valve stem and pump packing, where flexibility and recovery provide lasting seal integrity with minimal friction. For static sealing — flange gaskets, heat exchangers — our ePTFE sheets or impregnated sheets are preferred because they distribute sealing stress evenly and resist creep relaxation under constant load.
Density is the primary performance driver. Low density (0.4–0.5 g/cm³) is highly compressible and ideal for uneven, warped or low-pressure flange faces. Medium density (0.6–0.7 g/cm³) balances conformability with load-bearing capacity for most standard flange applications. High density or impregnated ePTFE (1.2 g/cm³ and above) is engineered for high-pressure, high-stress service with minimal creep and superior blow-out resistance.
Yes. Kaxite virgin ePTFE is manufactured in a cleanroom environment and is inherently pure. It meets FDA 21 CFR 177.1550 for food contact, is certified USP Class VI for biocompatibility and complies with EU 10/2011. It is widely used in WFI lines and high-purity chemical systems. Its non-toxic, non-leaching and non-contaminating properties make it the material of choice for sanitary and critical process applications.
While ePTFE shares PTFE's nearly universal chemical inertness, its porous structure can in some cases allow permeation of certain aggressive gaseous media under specific temperature and pressure conditions, where solid PTFE might better block. Continuous service above 260 °C may accelerate stress relaxation in tightly bolted flanges. For molten alkali metals or certain fluorine compounds at high temperature, consult our engineers before specifying.
Ensure flange faces are clean, aligned and undamaged, then centre the gasket on the flange — no adhesive is needed for sheet gaskets. Follow a cross-pattern bolting sequence and tighten in stages to 30%, then 60%, then 100% of the recommended torque. The typical seating stress for standard ePTFE gaskets is 4,000–7,000 psi. Always refer to the product-specific technical data sheet, since torque values depend on gasket density, size and flange rating.
Yes. We produce custom widths up to 1500 mm, thicknesses from 0.1 mm to 10 mm, and densities from 0.4 to 1.8 g/cm³. Impregnated ePTFE sheets are available for high-stress bolted flanges, and we can supply adhesive-backed tape or cord on spools. Send your drawing or specification for a quotation.
Store flat or on the original roll in a cool, dry place away from direct sunlight and heat sources. Keep in original packaging to avoid contamination or dust. ePTFE has unlimited shelf life and shows no age deterioration under normal storage conditions.
Send us your form (sheet, tape, cord or filament), density, thickness, width, quantity or finished-part drawing. Our export team replies within 24 hours and confirms lead time, packaging and documentation before you place a bulk order.
