What Is a Ring Joint Gasket?

A ring joint gasket is a sealing device used on a ring-type joint flange which is used for high-pressure applications. A ring joint gasket is unique as it uses metal rather than composite or elastomeric materials.  The RTJ gasket sits in a groove machined into each half of the flange joint. When the flange bolts are tightened, the soft gasket material flows into the harder flange to make a microfine seal.