Static Dynamic VAnti Extrusion AS568 Backup Rings Uncut

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 and compatibility requirements; no universal fluid or assembly pressure rating is established by this listing.

PTFE Backup Ring Material
Virgin PTFE hardness reference: 55 Shore D; confirm grade, test method and acceptance range.

Solid, scarf-cut and spiral constructions are separate choices. Identify the construction and installation route on the drawing before ordering.

Material range:

Virgin PTFE: review compression, creep and dimensional stability for the specified gland conditions.

Filled PTFE: specify glass, graphite, carbon or bronze formulation and filler content; review the fluid and mating-surface requirements.

Send the AS568 O-ring dash number and gland drawing with ring ID, OD, thickness, tolerances and quantity for quotation.

Define the clearance that requires support and the groove space available beside the O-ring. Include seal squeeze and operating temperature when reviewing ring dimensions.

Where an O-ring shows extrusion damage, record the damaged area, pressure direction and operating gap. Inspect the mating surfaces and provide the seal compound so replacement support can be reviewed.

Compare PTFE grade and rubber compound options using the complete assembly requirements. Include installation access, motion, surface finish and dimensional tolerances; adding support is not a substitute for checking the gland design.

For a single pressure direction, position support on the low-pressure side of the O-ring. For reversing pressure, review support on both sides with the required groove width confirmed on the assembly drawing.

NBR or FKM 90-durometer backup rings are separate rubber options. Confirm hardness scale and compound designation; the PTFE reference uses Shore D rather than rubber Shore A.

Contoured rubber or plastic rings require an approved section profile and material specification.

Related Rubber and Oilfield Components

Rubber O rings:

1) Standard O-Rings

Sizes: AS568 dash sizes or metric dimensions with specified tolerances.

Materials: NBR, silicone, FKM, HNBR or EPDM by specification; food-contact requirements need compound documentation.

Color: Black, Brown, or custom color.

2) Custom rubber o rings, X rings, or kinds of seals and washers&gaskets.

Custom parts are quoted against an approved drawing or sample with mating dimensions.

Specify shape, color and hardness requirements on the part drawing.

Hammer union seals

Rubber union seals with or without brass or stainless-steel backup rings; fit by assembly specification.

Available Material: NBR, FKM, HNBR.

Nominal union sizes: 1, 1.5, 2, 3 and 4 inches; seal dimensions by assembly drawing.

Plug seals

Available Material: NBR, FKM, HNBR ect.

Nominal size references: 1, 2 or 3 inches; plug seal fit by assembly drawing.

Dust Seals or Swivel Dust Seals

Oil saver rubbers

Pipe wipers

Swivel Ball Plugs

Thread Protectors

Related product photographs for reference; confirm the ordered ring by drawing:

Additional related product photographs:

For an anti-extrusion ring quotation, specify PTFE grade or rubber compound, construction and ring dimensions. Include the O-ring dash size, gland drawing, operating gap, fluid, temperature and pressure direction.