ePTFE gasket for valve sealing

For critical valve sealing in chemical processing, pulp and paper, pharmaceutical, and power generation plants, an ePTFE gasket for valve sealing is the preferred choice when standard PTFE gaskets exhibit excessive creep relaxation or require high bolt loads. The production of expanded PTFE begins with a biaxial stretching process that transforms virgin PTFE resin into a highly fibrillated, microporous matrix. This structure gives the finished gasket a unique combination of low seating stress, high compressibility, and controlled recovery. In practice, the gasket conforms to flange surface irregularities without taking a permanent set, which helps maintain a tight seal on valve bonnets, flanged joints, and pump connections over repeated thermal cycles. Because the material is chemically inert across the full pH range, it can be used with aggressive acids, caustics, solvents, and high-purity media without leaching or contamination. Our inventory covers several configurations for different piping classes. The expanded PTFE gasket for pump flange is designed for centrifugal, positive-displacement, and vacuum pump casings where flange alignment is not always perfect. The ePTFE ring gasket chemical resistant is ideal for acid transfer lines, solvent storage, and caustic scrubbers. For large-diameter or irregular flanges, the expanded PTFE cut gasket can be converted from sheet to any shape with tight tolerances. When standard sizes are not suitable, our custom expanded PTFE gasket supplier services support rapid prototyping and production runs for OEM valve manufacturers and maintenance teams.

The ePTFE gasket for valve sealing is made from 100% virgin expanded PTFE without binders, fillers, or adhesives. It is normally supplied as sheet material in thicknesses from 0.5 mm to 6.0 mm, and can be cut into full-face or raised-face gaskets to match ASME, EN, or JIS flange dimensions. For most valve flanges, 1.5 mm and 3.0 mm thicknesses provide the best balance between conformability and blowout resistance. Thicker sheets are recommended for flanges with pitting, waviness, or misalignment because the gasket can absorb more surface deviation without exceeding the bolt load limits of glass-lined or plastic flanges. The material has very low moisture absorption, does not support bacterial growth, and can be used in oxygen service when properly cleaned and specified. It also remains flexible at cryogenic temperatures, which makes it suitable for LNG, liquid nitrogen, and cold box valve applications. The following list and table summarize the standard material specifications, available formats, and independent test values for quick reference during specification and procurement.

• Material: 100% virgin expanded PTFE, multidirectional micro-fibril structure
• Standard sheet sizes: 60 in × 60 in (1524 mm × 1524 mm), 59 in × 59 in (1500 mm × 1500 mm), 39.4 in × 39.4 in (1000 mm × 1000 mm)
• Available thicknesses: 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 3.0 mm, 4.0 mm, 5.0 mm, 6.0 mm
• Flange standards: ASME B16.5, ASME B16.47, EN 1092-1, JIS B2220, DIN 2690, custom profiles
• Certifications: FDA 21 CFR 177.1550, USP Class VI, TA-Luft VDI 2200, EN 13555, WRAS, BAM oxygen service (on request)
• Color: white standard; blue, black, or custom filled grades available