When standard gasket materials fall short under extreme heat, pressure, or chemical exposure, graphite gaskets deliver the performance your application demands. At CGIM LLC, we manufacture custom graphite gaskets engineered for the most challenging industrial environments.
Graphite gasket material is composed of exfoliated graphite (a crystalline form of pure carbon) particles, giving it natural chemical inertness and thermal stability that other non-metallic gasket materials cannot match. Whether you need a single prototype or a production run of thousands, our custom gasket manufacturing capabilities allow us to produce graphite gaskets in virtually any size, shape, or configuration your application requires.
Technical Specifications
Graphite gasket material offers a performance profile suited for extreme service conditions. In oxidizing atmospheres, graphite gaskets are generally rated for continuous service temperatures up to approximately 850°F, though specific limits depend on the material grade and reinforcement type. In non-oxidizing or inert environments, they can handle temperatures significantly higher.
Graphite’s high compressibility allows it to conform to surface imperfections on flange faces, creating a tighter seal with less bolt load compared to many gasket materials. It also maintains low gas permeability and exhibits low creep relaxation over time, which means less need for re-torquing after installation. For applications requiring additional structural strength and blowout resistance, graphite gasket material can be reinforced internally with one or more smooth or tanged stainless steel or stainless steel foil layers. Contact us for detailed specifications on the compressed graphite materials we carry.
Benefits & Features
Graphite gaskets stand apart from other sealing materials for several practical reasons. The material is chemically inert to most acids, alkalis, solvents, and hydrocarbons, making it a dependable choice for aggressive media where rubber or fiber gaskets would deteriorate.
The low friction coefficient of graphite also makes it effective for applications involving thermal cycling. Unlike many gasket materials that harden and crack under repeated heating and cooling, graphite maintains its flexibility and sealing integrity through fluctuating temperature cycles. Graphite is also a non-asbestos material, making it a safe alternative to legacy gasket products without sacrificing high-temperature performance.
Because CGIM LLC operates out of a 65,000+ square foot facility with flash cutting, waterjet cutting, precision die cutting, and in-house die making capabilities, we can deliver graphite gasket cutting with tight tolerances and fast turnaround.
Ideal Applications for Graphite Gaskets
Graphite gaskets are specified across industries where failure is not an option. Common applications include flange gaskets in chemical processing plants, sealing solutions for steam lines and heat exchangers in power generation, or valve and pump gaskets in oil, gas, and chemical processing operations. The material is also used in pulp and paper facilities and steel and metals processing, where exposure to corrosive chemicals and high temperatures is routine.
If your application involves aggressive media at elevated temperatures, or if you are replacing an older asbestos-based gasket, a custom graphite gasket is often the right fit. Contact our team to discuss your specific sealing requirements, and we will help you choose the right material configuration for your environment.
FAQs
What is the typical temperature range for graphite gaskets?
In oxidizing atmospheres (which covers most standard industrial applications), graphite gaskets are generally rated for continuous service up to approximately 850°F. In non-oxidizing or steam environments, the material can tolerate significantly higher temperatures. The specific temperature limit depends on factors like the graphite grade and whether the gasket includes a metal reinforcement layer. Our team can help you confirm the right material for your operating conditions.
Can compressed graphite gaskets be reused after removal?
Like all gasket materials, graphite gaskets should be replaced whenever a joint is disassembled. To varying degrees (see “recovery percentage” in gasket test data), gasket materials tend to “take a set” and conform to flange surface imperfections during the initial compression, which can change the material’s profile permanently. Once removed, the gasket may not seal properly if reinstalled. A new gasket should be used each time a flanged connection is broken and reassembled.
What is the difference between compressed graphite and flexible graphite gaskets?
Compressed graphite gaskets are made from exfoliated graphite particles that are pressed into sheet form. Flexible graphite is a broader term that can refer to homogeneous graphite sheet, laminated graphite with metal foil inserts, or graphite with a stainless steel tang core. All fall under the flexible graphite category, but the reinforcement method affects the gasket’s pressure rating, blowout resistance, and handling characteristics. Our team can help you determine which configuration fits your application.
What cutting methods does CGIM LLC use for graphite gaskets?
We offer multiple cutting methods for graphite gaskets, including flash cutting and precision die cutting. The best method depends on the gasket geometry, material thickness, and order quantity. For prototypes or short runs, flash cutting provides precision without the need for custom tooling. For higher-volume production, die cutting is typically more cost-effective.