Collective term for seals with a low height compared to the sealing surface and that adapt to the sealing surface over their entire width. They therefore generally have a more or less rectangular cross section. Moulded seals with a large surface (e.g. cylinder head seals) are also flat seals.
Flat seals are made from almost all materials suitable for seals: Metals with or without padding and non-metallic materials, such as rubber, PTFE, It, asbestos substitute and others.
Flat seals are rarely used in fluid technology unlike in motion technology, pipework manufacture etc.