ePTFE expanded ptfe gasket sheet
The expanded PTFE gasket sheet combines the chemical purity of a traditional PTFE gasket sheet with a highly compressible micro-expanded structure that seats firmly against uneven flanges, delivering a clean, stable seal across corrosive and temperature-cycling systems.
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ePTFE Data Sheet
| Test Item | Unit | Target |
| Compressibility | % | 45+/-5 |
| Rebound Rate | % | ≥10.0 |
| Sealing Leakage Rata | cm³ / s | ≤1.0 x 10‾³ |
| Density | g/cm³ | 0.7-0.9 |
ePTFE Specification
| Width x Length x Thickness (mm) | ||
| 1500*1500*0.5 | 1500*4500*0.5 | 1800*5400*0.5 |
| 1500*1500*1 | 1500*4500*1 | 1800*5400*1 |
| 1500*1500*2 | 1500*4500*2 | 1800*5400*2 |
| 1500*1500*3 | 1500*4500*3 | 1800*5400*03 |
| 1500*1500*4 | 1500*4500*4 | 1800*5400*4 |
| 1500*1500*5 | 1500*4500*5 | 1800*5400*5 |
| 1500*1500*6 | 1500*4500*6 | 1800*5400*6 |
| 1500*1500*8 | 1500*4500*8 | 1800*5400*8 |
| 1500*1500*10 | 1500*4500*10 | 1800*5400*10 |
The expanded PTFE gasket sheet is produced by transforming conventional PTFE into a highly fibrillated, multidirectional structure that offers greater compressibility and adaptability than a standard PTFE gasket sheet. During expansion, PTFE forms an interconnected micro-porous matrix capable of deforming uniformly under low bolt loads, allowing the sheet to seal effectively against damaged, warped, or coated flange surfaces where dense materials struggle to achieve full contact. Because expanded PTFE is chemically identical to virgin PTFE, the sheet maintains complete resistance to acids, alkalis, solvents, and ultra-pure process media. This chemical inertness, combined with exceptional dimensional stability from cryogenic temperatures to around 260°C, makes the material suitable for critical installations typically served by products supplied by advanced ePTFE manufacturers. The fibrillated structure minimizes creep and cold flow, enabling stable gasket performance during thermal cycling or pressure variation, especially in systems requiring long sealing intervals without re-torquing.
In operational environments, the expanded PTFE gasket sheet conforms quickly to flange faces, filling micro-voids that may be present on stainless steel, glass-lined equipment, FRP housings, enamel-coated flanges, or older metallic surfaces. This ability to compensate for irregularities reduces the need for surface machining and makes the material a strong option where low bolt stress is required. The sheet can be converted into rings, tapes, and custom profiles without fraying, supporting precise fits in reactors, pumps, exchangers, and controlled-purity pipelines.
Across chemical plants, pharmaceutical facilities, wastewater systems, food equipment, and vacuum or gas-handling units, expanded PTFE provides a stable, non-aging seal that resists sticking, hardening, and media absorption. Its predictable compressive behavior and non-contaminating characteristics allow engineers to use it as a direct replacement for traditional gaskets when reliability and cleanliness are mandatory.
