Gaskets | <p>Three main classifications of gasket materials are used for a wide range of different applications: these are <strong>non-metallic, </strong>metallic and semi-metallic.</p><ol> <li><strong>Non-metallic / Soft</strong> – Compressed non-asbestos fibre (CNAF), PTFE, rubber, ceramic fibre.</li> <li><strong>Metallic / Hard</strong> – oval ring, octagonal ring.</li> <li><strong>Semi-metallic / Composite</strong> – spiral wound, metal jacketed, camprofile.</li></ol><p>By definition, a gasket is a mechanical seal that fills the space between two or more mating surfaces, often to prevent leakage while the joined objects are under compression.</p>