NBR O-rings » Assortment Technical informations

O-rings are the most widely used sealing elements. Their sizes are defined by the internal diameter and the thickness of the cord (cross-section). We mainly stock O-rings in metric or inch dimensions made from NBR (nitrile butadiene rubber, Perbunan®), 70° Shore A, as these are the sort most often used. Of course, we can also supply you with O-rings in other materials such as PTFE = Teflon, PU = polyurethane; MVQ silicone = methyl vinyl silicone rubber, EPDM = ethylene propylene diene monomer rubber etc. When O-rings are pressed against their mating sealing surfaces by a contact force, a closed line results at the circumference within the sealing surface. They are thus activated by pressure, can be harder or softer and are detachable. They will be destroyed if the maximum permissible pressure is exceeded or if the wrong elastomer has been used as the material. They must not shrink or swell and must remain elastic. O-rings can be installed radially, axially or in grooves, even in corners.