In high-temperature sealing applications, material selection determines how long a flange connection stays leak-free. A silica filled PTFE gasket sheet for high temp is specifically formulated to overcome the limitations of virgin PTFE, which tends to creep and deform under load at elevated temperatures. By adding fine amorphous silica, the sheet gains higher compressive strength, reduced cold flow, and better torque retention. As a silica PTFE sealing sheet, it offers superior resistance to acids, alkalis, solvents, and oxidizing media while maintaining a service temperature range from -200°C to +260°C continuous, with short excursions up to 300°C. We manufacture this PTFE gasket sheet with silica filler using a fully traceable process, and every sheet passes dimensional inspection, density verification, and leak testing before dispatch. Buyers looking for consistent lot-to-lot performance can rely on our quality system as a certified silica filled PTFE sheet manufacturer.
The High Temperature Silica Filled PTFE Gasket Sheet is designed for flange connections in steam lines, heat exchangers, reactor vessels, and pharmaceutical processing equipment. This product name identifies a premium sealing material that combines the chemical compatibility of PTFE with the mechanical stability of a silica filler. It is especially effective where standard PTFE gaskets fail from extrusion or relaxation. The sheet cuts cleanly, installs quickly, and does not require special adhesives. It is suitable for use with glass-lined flanges, plastic flanges, and metal flanges where bolt load is limited. When cutting this material, use sharp steel rule dies or waterjet to produce clean edges. The sheet is dimensionally stable up to the rated temperature, which minimizes retorquing during thermal cycling. Because the silica filler reduces cold flow, the gasket maintains bolt preload better than virgin PTFE, leading to fewer leaks and longer service intervals. The product is available in multiple thicknesses and sheet sizes, and can be converted into custom gaskets, rings, and strips on request.
Key Product Parameters
Typical Performance Data
| Property | Test Method | Typical Value |
|---|---|---|
| Density | ASTM D792 | 2.2 g/cm³ |
| Tensile strength | ASTM D638 | 15 MPa |
| Elongation at break | ASTM D4895 | 250% |
| Hardness | Shore D | 62 |
| Compressibility | ASTM F36 | 9% |
| Recovery | ASTM F36 | 45% |
| Creep relaxation | ASTM F38 | 25% |
| Sealability | DIN 3535 | 0.03 cm³/min |
| Continuous temperature range | — | -200°C to +260°C |
| Peak temperature | — | +300°C |
| Maximum pressure | — | 55 bar |
