When sealing flanged joints in chemical processing, petrochemical, or pharmaceutical piping systems, expanded PTFE gasket tape for flange sealing delivers a reliable, creep-resistant seal. Our ePTFE tape seal for pipe joint is manufactured from 100% virgin PTFE that undergoes a controlled expansion process, creating a multidirectional fibril structure with exceptional conformability to irregular flange surfaces. For standard or custom widths, the PTFE expanded sealing tape provides a cost-effective alternative to pre-cut gaskets, and it is available in densities from 0.6 g/cm³ to 1.2 g/cm³ to match specific seating stresses. As a trusted expanded PTFE tape gasket supplier, we offer spooled lengths up to 50 meters, allowing maintenance teams to reduce inventory and instantly fabricate gaskets on site. In high-temperature applications up to 260°C (500°F), our high temperature ePTFE tape maintains its seal integrity without the use of fillers or pigments, which is critical for food-grade and ultra-pure chemical services.
Expanded PTFE Gasket Tape is engineered to seal full-face and raised-face flanges, pump housings, manways, and heat exchangers where aggressive media or thermal cycling can cause conventional gaskets to fail. The tape’s low coefficient of friction and high cold-flow resistance allow it to conform to surface imperfections while preventing blowout under cyclic loads. Its fluoropolymer structure resists attack from virtually all industrial chemicals, including strong acids such as hydrochloric and sulfuric, alkalis, solvents, and oxidizing media, making it suitable for services ranging from CIP chemicals to monomers and heat transfer fluids. Below are the key dimensional and performance parameters for quick selection:
The following table summarizes the physical and chemical resistance properties of Expanded PTFE Gasket Tape:
| Property | Test Method | Typical Value |
|---|---|---|
| Tensile strength (longitudinal) | ASTM D1708 | 8–12 MPa |
| Elongation at break | ASTM D1708 | 40–80% |
| Operating temperature range | ASTM D4591 | -268°C to +260°C (-450°F to +500°F) |
| Pressure rating | Flange class dependent | Full vacuum to 40 bar (580 psi) |
| pH resistance | — | 0–14 |
| Creep relaxation | ASTM F38 | < 30% |
| Gas permeability | DIN 3535 | < 0.1 cm³/min |
| Certifications | FDA, USP | FDA 21 CFR 177.1550, USP Class VI, TA-Luft (VDI 2440) |
For flange sealing in high-cycle or high-temperature environments, selecting the correct density is essential. A lower density tape (0.6–0.8 g/cm³) provides superior conformability on glass-lined or plastic flanges, while a higher density tape (1.0–1.2 g/cm³) offers greater tensile strength for metal flanges with high bolt loads. Expanded PTFE Gasket Tape can also be supplied with a pressure-sensitive adhesive backing in widths from 10 mm to 50 mm, and custom lengths or die-cut shapes are available on request. Installation is straightforward: cut the tape to the required flange circumference, overlap the ends by at least 10 mm at a non-critical area, and apply the specified bolt torque in a star pattern. Because the material is self-forming, it compensates for minor flange misalignment and waviness without the need for additional sealants. All rolls are marked with batch numbers for traceability and are packaged in clean, contamination-free poly bags to preserve material properties prior to use.
