An O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, forming a seal at the interface.
Some small O-rings
A gasket is a mechanical seal which fills the space between two or more mating surfaces, generally to prevent leakage from or into the joined objects while under compression. It is a deformable material that is used to create a static seal and maintain that seal under various operating conditions in a mechanical assembly.
Some seals and gaskets 1. o-ring 2. fiber washer 3. paper gasket 4. cylinder head gasket
Polytetrafluoroethylene (PTFE) gasket
Compressed fiber gasket
Gasket containing white asbestos, dismantled during a redevelopment project in Germany. Parts containing asbestos must be dismantled and disposed of with care, in this case following the BAuA TRGS 519 technical guide for handling asbestos during demolition, reconstruction or maintenance work