The MA-seal is used within the cellulose, chemical and petroleum industries. The secondary seal in PTFE makes the seal usable in high temperatures and for aggressive medias. At Obbola Linerboard, Umeå, an average life of more than five years has been noted for about 300 seals.
ME is a hydraulically balanced variant of type MA. This enables the seal to work in high-pressure applications. The shaft must have a step or sleeve so that the secondary seal will be located on a larger diameter than the inner diameter of the sealing ring. The type MD seal is the same as MA, but built in length according to DIN 24960.