Expanded PTFE spiral wound gasket filler material is a soft, thin, flexible tape made from 100% white pure virgin PTFE resin that has been expanded into a fibrous micro-porous structure. It is used as the "soft inner layer" of a spiral wound gasket — the metal winding provides the mechanical strength and resilience, while the ePTFE filler material sits between the metal layers and provides the actual sealing barrier.
Unlike graphite or ceramic fillers that can harden, oxidize or crack over time, ePTFE filler will not age, shrink, dry out or harden in service, and it is chemically inert to almost every industrial medium. Its conformability lets it seal rough or damaged flange surfaces while retaining the resilience needed for thermal cycling. The result is a spiral wound gasket with the strength of metal windings plus a soft, chemically inert, temperature-stable seal. Related ePTFE products: Expanded PTFE Joint Sealant, Expanded PTFE Sheet and Expanded PTFE Gasket.
The ePTFE filler is the soft inner layer between the metal windings
Stainless steel or other alloy strip wound in a V or W profile — provides the mechanical strength and spring-back of the gasket.
The expanded PTFE tape layer alternates between the metal windings — this is what actually seals the media. Chemically inert, temperature stable, does not age.
Optional carbon steel or stainless steel ring that controls compression and keeps the gasket centered on the flange.
Choose the filler that matches your media and temperature
| Property | ePTFE Filler | Graphite Filler | Ceramic Filler |
|---|---|---|---|
| Chemical Resistance | pH 0-14 universal | Not for oxidizing media | pH 0-14 except HF |
| Temperature | -240°C to +260°C | -200°C to +450°C (inert) | -100°C to +1000°C |
| Aging / Hardening | Does not age | Can oxidize in air | Brittle, cracks |
| Food Grade | FDA compliant | Not suitable | Not suitable |
| Conformability | Excellent | Good | Poor |
| Best For | Chemical, food, pharma service | Steam & high-temp refinery | Ultra-high temp furnaces |
Why ePTFE is the highest-performance filler for spiral wound gaskets
Does not harden, shrink or dry out in long-term service
Unaffected by almost every industrial medium — pH 0-14
-240°C to +260°C continuous service range
Seals rough, pitted or damaged flange surfaces
Easy to wind onto spiral wound gasket machines
100% virgin PTFE for food, pharma and beverage
Wherever spiral wound gaskets need a chemically inert, temperature-stable filler
Aggressive media piping
Refinery & pipeline flanges
Hygienic FDA service
Steam & cooling water lines
Desalination & water lines
Offshore platform piping
Fuel & hydraulic systems
High-purity process lines
Complete ePTFE product family from Kaxite Sealing
It is the soft inner layer of a spiral wound gasket, wound between the V or W shaped metal windings. The metal provides mechanical strength and spring-back; the ePTFE filler provides the actual sealing barrier against the media. See the product page for full details.
ePTFE offers universal pH 0-14 chemical resistance and FDA compliance but is limited to +260°C. Graphite tolerates higher temperatures (up to +450°C in inert atmospheres) but is not suitable for oxidizing media or food service. Ceramic tolerates the highest temperature (+1000°C) but is brittle and cracks easily.
Standard tape widths are 3 mm to 15 mm, thicknesses 0.5 mm to 3 mm, in continuous rolls. Custom widths and thicknesses are available on request with no extra tooling charge for standard materials. Send your requirement for a fast quotation.
Yes. Our expanded PTFE spiral wound gasket filler material is manufactured from 100% virgin PTFE and complies with FDA 21 CFR 177.1550 for food contact. It is also RoHS and REACH compliant. See our Our Certificate page.
Yes. Every shipment includes Mill Test Certificate and dimensional inspection record. Third-party inspection (SGS, BV, TUV) is available on request. Contact us via Contact Us to discuss documentation requirements.
MOQ is 10 kg for standard sizes. Lead time is 7-15 days after order confirmation. Payment terms are T/T or L/C. Free samples are available — you only cover the courier cost. Send your inquiry for a fast quotation.
Send us your required tape width (3-15 mm), thickness (0.5-3 mm) and roll length — we slit and re-roll to your exact specification. No extra tooling charge for standard material.
Get Custom QuoteVerify material softness, thickness and chemical resistance against your own specification before placing a bulk order. Standard widths available as samples.
Contact Us NowKaxite expanded PTFE spiral wound gasket filler material is a thin, continuous PTFE tape wound together with the metal strip to form the soft sealing element of a spiral wound gasket. It is produced from 100% virgin PTFE in dust-free workshops and expanded into a micro-porous network, which retains PTFE's chemical inertness while reducing cold flow and creep relaxation. Standard tape thickness is 0.5–0.9 mm, width 3.0–9.0 mm, and roll length 5–100 m. Working temperature is −268 °C to +280 °C, pressure rating is 200 kgf/cm² for liquid and 140 kgf/cm² for gas, and chemical resistance covers pH 0–14.
