Graphite Sealing Rings: Structure And Classification

Graphite self-sealing rings are components formed by molding low-sulfur expanded graphite. Typically, they feature a square cross-section, though wedge-shaped or V-shaped profiles are also available; the latter two designs are particularly suitable for high-pressure applications. Reinforced graphite rings incorporate internal inserts-such as 304 stainless steel strips, steel mesh, or nickel foil-within the expanded graphite packing structure to enhance compressive strength. During the molding process, graphite self-sealing rings may be reinforced using 0.2mm-thick stainless steel foil or stainless steel wire mesh; for service conditions involving elevated pressures and temperatures, the use of graphite self-sealing rings with their top and bottom surfaces clad in thin metal foil is recommended. The most common gasket configuration is the molded ring, which is manufactured by cutting flexible graphite sheets into strips that are then wound and compressed within a mold; these rings can be supplied with a 45-degree scarf cut, tailored to specific user requirements.

The primary classifications of graphite self-sealing rings include standard graphite packing rings (or self-sealing graphite rings), closed-type flexible graphite packing rings, and reinforced graphite rings. In terms of supply format, they can be provided either by weight or by individual unit count.