Back up ring
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It is always used in conjunction with o-ring. when subjected to pressure, the o-ring can be forced into the sealed gap and thus destroyed. it is fitted in order to restrict the size of the gap and thereby prevent the o-ring from extruding into it. the use of this a reliable o-ring seal effective over a wide pressure and temperature range.
  • Pure-PTFE
  • Modified pure-PTFE
  • Pure-PTFE + glass fiber
  • Pure-PTFE + bronze
  • Pure-PTFE + carbon + bronze
  • Pure-PTFE + ekonol
  • Pure-PTFE + nylon66(polyamid)