Back-up rings kits are made with Buna 90, FKM or Teflon. Back-up rings are 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 causing the O-ring to extrude. The hard Back-up ring material will keep the O-ring material from flowing into the gap which will prevent premature failure.
AS568 Standard Inch O-RingsMetric O-Rings - ISO3601 Global O-RingsOSK™ Assorted O-Ring Kits ↪ Buna-N 70 O-Ring Kit ↪ Buna-N 90 O-Ring Kit ↪ Aflas O-Ring Kit ↪ Automotive O-Ring Kit ↪ Back-Up Ring Kit ↪ Boss O-Ring Kit ↪ Buna-N 50 O-Ring Kit ↪ Caterpillar Compatible O-Ring Kit ↪ EPDM O-Ring Kit ↪ Face Seals ↪ FDA Grade O-Ring Kits ↪ Flange Kits ↪ HNBR Green O-Ring Kit ↪ Metric O-Ring Kit ↪ Neoprene O-Ring Kit ↪ OSK™ CV75 Extreme Chemical Resistant FKM O-Ring Kits Black ↪ OSK™ FKM (Fluorocarbon) O-Ring Kits Black 90 Duro ↪ OSK™ FKM/Viton (Fluorocarbon) O-Ring Kits ↪ OSK™ Max Truck O-Ring Kits ↪ OSK™ X-Ring Kits ↪ Paintball & Air Rifle Kits ↪ Plumbing O-Ring Kit ↪ Pressure Washer Kits ↪ PTFE Temperature & Chemical Resistant O-Ring Kits ↪ Silicone O-Ring Kit ↪ Square O-Ring Kits ↪ Urethane O-Ring KitO-Ring Cord for Versatile and Custom Sealing SolutionsVulcanized O-Rings - Precision Tailored to Your NeedsOlypsys® O-Ring Measurement App - How to Properly Measure O-Rings!Hydraulic Seals, Wipers, Rod Seals, Piston Seals, and Wear RingsO-Ring Lubrication ProductsOil Seals - Shaft SealsOSK™ Air Nailer O-Ring KitsOSK™ Hydraulic Cylinder Seal KitsOSK™ O-Ring Repair KitsOSK™ Sanitary & Brewery GasketsOSK™ Spray Foam O-Rings for Graco® and PMCOSK™ OEM Replacement O-RingsOSK™ Custom O-Rings & KitsFeatured Products ...
Quality Policy ISO-9001:2015 AS568 O-Ring Information How to Measure an O-Ring Like a Pro! Experience the Future of O-Ring Measurement with Olypsys® O-Ring Back-Up Ring Sizes O-Ring Elastomers Custom Labeled and Packaged Solutions FDA and 3-A Sanitary O-Rings Food, Dairy & Water O-Ring Groove Chart Metric O-Ring Information ASTM Specifications O-Ring Groove Information - AS568 O-Ring Size Chart PDF O-Ring Cord Information Hydraulic Seal Information ® Site-Wide Trademark List O-Ring Temperature Chart O-Ring Shelf Life RoHS & REACH Info Quality Standards Manual O-Ring Durometer - Why is Shore A Hardness Import?