Wire mesh catalytic converter seals are manufactured using mesh that is usually compressed in a die to make an even-density, all-metal one-piece end seal ring. They are designed to protect delicate ceramic bricks and intumescent mats from gas erosion and to prevent exhaust gas bypass between the brick and the inner catalytic converter shell. They are also used extensively within diesel particulate filter assemblies.
Assemblies with two seals that fit around either end of the monolith brick, that are joined by connecting mesh, can also be produced. These seals are particularly useful where the converter can design does not have any other way of keeping seals in position.