Backup Rings

Contoured Rubber Backup Rings — 90 Shore A Material and Profile Selection Contoured rubber backup rings support the O-ring adjacent to the extrusion clearance. For a replacement, identify the NBR or FKM compound, nominal 90 Shore A hardness and section profile together with the mating O-ring and groove drawing. O-ring nibbling at a loaded clearance can indicate inadequate support. Record the damage location, maximum pressure, temperature and operating gap before selecting the

AS568 O-Ring Anti-Extrusion Backup Rings — PTFE and Rubber Options An anti-extrusion backup ring supports the primary O-ring at the clearance gap. Choose PTFE or a specified rubber compound against the gland drawing, installation method and operating conditions; nominal O-ring size alone does not establish ring fit. Specify pressure peaks, clearance under load, fluid composition and temperature for material review. PTFE grades and rubber compounds have different deformation

AS568 O-Ring Backup Rings — Standard Size References and Custom Gland Dimensions PTFE backup rings support an O-ring at the extrusion gap in a specified static or dynamic gland. Identify the AS568 O-ring dash number and the actual groove dimensions; the O-ring size reference alone does not define the backup ring geometry. Choose the PTFE grade against fluid composition, temperature, pressure peaks and clearance under load. Review grade-specific compatibility and deformation

PTFE Backup Rings — Solid, Scarf-Cut and Spiral Construction Selection PTFE backup rings support an O-ring adjacent to the extrusion gap. Define the gland dimensions and installation access before selecting solid, scarf-cut or spiral construction for the specified static or dynamic assembly. Ring construction and PTFE grade must be selected together with fluid, temperature, pressure peaks and operating clearance. Compatibility and extrusion resistance depend on the complete

PTFE Backup Rings — Custom Section and Order Specification PTFE Backup Rings for O-Ring Extrusion Support For a custom PTFE backup ring, define the section geometry and its position in the O-ring gland. Submit the ring and groove drawings together so that inner diameter, outer diameter, axial thickness and any contoured surface can be reviewed as one assembly. Specify pressure direction, maximum differential pressure, operating temperature, fluid formulation and clearance

PTFE Backup Rings — Groove Width and Seal Support Clearance A PTFE backup ring supports an O-ring at the extrusion clearance. Match its ID, OD and axial thickness to the complete groove, including the space required by the O-ring. Specify static or dynamic service before dimensional review. Define operating clearance, temperature, fluid and pressure peaks together with the PTFE grade. Ring dimensions and material data must be reviewed as part of the assembly; PTFE does not

PTFE Anti-Extrusion Backup Rings — Fluid Compatibility and Grade Specification A PTFE backup ring supports an O-ring at the clearance gap in a specified static or dynamic gland. Select ring geometry and construction against the groove drawing and installation method. For fluid compatibility review, identify the exact hydraulic fluid, additives, cleaning agents and contact temperature. Virgin and filled PTFE grades require their own material data; a general PTFE description

AS568 O-Rings and PTFE Backup Rings for Static Gland Assemblies For a static seal, the O-ring provides sealing contact while a correctly fitted backup ring supports it at the extrusion clearance. Specify the O-ring dash size and groove drawing together; a backup ring does not replace the primary seal. Review PTFE grade, O-ring compound, fluid composition, temperature and pressure cycles for the complete static assembly. Compatibility and pressure capability depend on these

PTFE Backup Rings — Dynamic Gland and Operating Clearance Review PTFE backup rings provide extrusion support for the primary O-ring. For a reciprocating or moving gland, specify the motion type, stroke, speed and duty cycle together with the seal-stack geometry. Dynamic suitability requires review of the complete assembly. Provide normal and peak pressure, fluid formulation, temperature and the maximum clearance under operating load. PTFE grade, fillers and support geometry

PTFE Backup Rings — Pressure Reversal and Support Placement PTFE backup rings support the O-ring at the extrusion clearance. For a gland exposed to pressure from either direction, specify the pressure sequence and the space available on each side of the primary seal. Review steady pressure, transient peaks, temperature and clearance under load when selecting a PTFE support ring. Fluid compatibility depends on the selected PTFE grade and any fillers; a backup ring alone does

PTFE Backup Rings — Replacement Dimensions and Drawing Control For a PTFE backup-ring replacement, match the section geometry and material grade to the gland drawing. A worn or deformed sample can help identify the construction, but its measured dimensions may differ from the original specification. Record the backup-ring inner diameter, outer diameter and axial thickness together with tolerances. Include the mating O-ring, groove width and depth, operating clearance,

Custom Plastic Washer Rings and Gaskets: PEEK and PTFE Material Selection Material options for drawing-specific washers: Virgin PTFE: specify sealing or bearing duty, contact load, temperature and dimensional stability requirements before selecting the grade. Filled PTFE: glass, graphite, carbon or bronze fillers are separate grades. Select filler type and proportion against mating surfaces, wear requirements, chemical exposure and compression under load. Virgin PTFE 100%

Solid Flat Backup Rings: PEEK / PTFE Rings for AS568 O-Ring Glands A solid flat backup ring supports an O-ring at the extrusion clearance. Select the ring dimensions and polymer grade for the actual static or dynamic gland, pressure direction and installation access. PTFE and PEEK are separate material choices. Specify fluid formulation, operating temperature, peak pressure and clearance under load; compatibility and extrusion resistance require grade-specific data and the