Polyurethane / Urethane Back-up Rings

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Back-up Ring -- BUM - Image
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Back-up Ring -- BUM
from Hi-Tech Seals, Inc.

Back-up rings are plastic or rubber rings used to prevent the O-ring from entering the clearance gap. When high pressures are exerted on the O-ring its soft rubber material can be forced into the clearance gap caused the O-ring to extrude. The hard back-up ring material will keep the O-ring material... [See More]

  • Sealing Element or Lip Material (ASTM Abbreviation): Polyurethane
  • Design Units: Metric
  • Construction: Contoured Face (optional feature); Spiral Back-up Ring (optional feature)