Under lower preload forces, the serrated combination gasket is the first choice. The soft sealing layer on its surface prevents direct metal-to-metal contact, ensuring a firm and tight separation that protects metal flanges from damage even under extremely high loads. Serrated combination gaskets are particularly suitable for applications involving high temperatures, high pressures, and alternating operating conditions. They serve as an ideal alternative to traditional metal-coated gaskets in flange connections for heat exchangers, vessels, and reactors.
Graphite metal serrated gaskets are suitable for high-temperature and high-pressure environments, exhibiting strong corrosion resistance and providing stable and firm sealing. Operating temperature range: up to ~650°C; operating pressure range: 6.4 to 25.0 MPa. With a low preload stress gasket index, these gaskets feature a sturdy metal core with fine grooves etched on its surface. The metal core is typically made of stainless steel, but other metallic materials can be selected based on specific operating conditions.
The grooves on the surface of the metal core are covered with a soft sealing material facing. The selection of the facing sealing material also depends on the operating conditions. Generally, flexible graphite and Teflon are the most commonly used materials, with other soft sealing materials also available. The sturdy metal core provides excellent compressive strength, while the soft sealing facing, when compressed, can effectively compensate for imperfections in the flange sealing surface, providing good protection to the flange surface.
Metal serrated gaskets are recommended for sealing applications where the gasket clamping stress is not high. The fine grooves in the core of the gasket form multiple circular sealing lines, enhancing the effective application of load by reducing the contact area, in combination with the soft sealing material facing.
Metal serrated gaskets achieve metal-to-metal sealing, thereby possessing excellent compressive performance. They are easy to handle and install on the job site, and the gaskets can be reused after being processed by the manufacturer.
