S9B buffer seals

S9B seals are buffer seals incorporating slide rings and (fig. 1) have a nitrile rubber (NBR) O-ring energizer and a PTFE slide ring as standard. Depending on the application, SKF can manufacture the slide rings from a variety of PTFE materials. On request, SKF can supply these profiles also with X-ECOPUR polyurethane (TPU) slide rings for improved wear resistance and ease of installation compared to PTFE. S9B profiles with a PTFE slide ring are suitable for pressures up to 400 bar (5 800 psi), those with an X-ECOPUR slide ring up to 600 bar (8 700 psi). These profiles are suitable for medium to heavy duty applications. Both material combinations are available in metric and inch sizes, some metric sizes fit seal housings in accordance with ISO 7425-2:1989 or ISO 3320:2013. For additional information, refer to S9B profile data below.