One of the primary advantages of ePTFE sheet material is its enhanced compressibility compared to solid PTFE. This softness allows it to conform exceptionally well to irregular, scratched, or damaged flange surfaces, ensuring a tight and reliable seal even with lower bolt loads. This characteristic minimizes the potential for leaks often encountered with less conformable materials on imperfect surfaces. Furthermore, the structure of ePTFE significantly reduces the problems of creep (deformation under sustained load) and cold flow (material extrusion under pressure at ambient temperatures), which are common limitations of conventional PTFE. This superior dimensional stability ensures the integrity and longevity of the seal over extended periods and varying operational conditions.
Its versatility makes ePTFE sheeting a truly universal gasket solution within the PTFE family, capable of replacing skived, filled, or envelope PTFE gaskets in many applications. Its outstanding chemical inertness, inherited from virgin PTFE, means it resists attack from nearly all chemicals across a wide temperature range, making it suitable for aggressive media environments. Additionally, the material's compliance with FDA regulations (such as 21 CFR 177.1550) confirms its suitability for sensitive applications involving direct contact with food, beverages, and pharmaceuticals.
Complementing the sheet form, Expanded PTFE Joint Sealant, often supplied as a flexible tape or cord with an adhesive backing, offers similar benefits but in a form-in-place gasket format. This sealant tape is ideal for sealing large, complex, or non-standard flanges where cutting a sheet gasket is impractical or wasteful. It conforms easily to intricate shapes and provides a reliable seal with the same excellent chemical resistance, temperature tolerance, and reduced creep characteristics as ePTFE sheets, making both forms high-performance sealing solutions for demanding industrial applications.
