25.08.2021 O-RING: 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, creating a seal at the interface. Salmastra, biri hareketli, diğeri sabit bulunan iki makine parçası arasında sızdırmazlık sağlayan parçalara salmastra denir. Genelde pompa, musluk, mil yatağı gibi yerlerde kullanılır. Reaktörde de bundan var.