back-up rings have no intended sealing function. instead, as their name indicates, they are protective and supporting elements made from extrusion-resistant materials which generally have a rectangular cross section. they are installed in a groove together with an elastomeric sealing element preferably with a corresponding o-ring in static appli- cations.

due to the tight fit of the back-up ring in the housing, they prevent extrusion of the pressurised elastomeric sealing element into the sealing gap common inactive back- up ring, mainly used with o-ring to avoid gap extrusion. split and non split design avail- able.

slit bearing component with rectangular cross-section for ISC o-ring sealing on the out- side & inside.


not bolded symbols; please consult our technical for application limitations

category of profile

machined only.

operating parameters & material

material temperature
POM -50 °C … +100 °C
 PA -40 °C … +100 °C
PTFE glass -200 °C … +260 °C

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

2 POM up to ø260 mm, PA above ø260 mm

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog…

tolerance value and surface finish according to corresponding seal data sheet

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.