Hydraulic & Fluid Seals

Back-Up Rings

Back-up Rings, Anti-extrusion Rings

For static or dynamic sealing applications

Example of back-up ring installation	Back-up ring profile example

Back-up rings provide added extrusion resistance, and prevent damage to O-rings and seals when subjected to high pressures, larger extrusion gaps, and/or high temperatures.
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Back-up rings are used if:

• The operating pressure or pressure spikes exceed the seal’s extrusion resistance.
• The extrusion gap exceeds maximum recommendation.
• High temperature lowers the seal’s extrusion resistance and presents high risk for seal extrusion.

Modular vs. Positively-actuated vs. No Back-up Ring

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Back-up Ring Profiles

F2	ST9	ST16	F2HP

ST20	ST21	ST10	ST11

ST12	ST13

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For your unique or special sealing application, please contact our engineers to help you in specifying a back-up ring that’s best for your situation.

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Availability: Most standard or non-standard and application-specific designed back-up rings, in inch or metric sizes, are available with a 1-4 day turnaround.

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Why American High Performance Seals?
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Seal Materials: The selection of the best material has a critical impact on achieving the best performance. Our comprehensive range of leading edge standard, high- and low-temperature materials include: High-performance Polyurethane (P101), PTFE (Teflon®), filled PTFE, Hytrel®, FDA compliant materials, Nylon, Nylatron®, POM, UHMWPE, Tefzel®, and Peek, along with our proprietary specialized materials. More Info on Materials

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AHPSeals Back-up Rings are currently in successful service in the following industries:

Steel Works Government, Military and Defense Abrasive Substance Pumps and Valves Pharmaceuticals Can and Package Filling Machines Oil-Field Exploration and Production Paint and Solvent Manufacture and Application Adhesives Dispensing Valves and Cylinders Chemical Pumps Cryogenic Liquid Control Components Liquid Handling Swivel Joints Hydraulics Construction Equipment Drilling Equipment

Chemical Pumps and Valves Heavy Mobile Equipment Mining Rubber and Plastics Presses Food Processing Space Exploration Marine Tire Production Low Friction Vacuum Service Automotive Plants Pharmaceutical Production Domestic Goods Production Many other applications

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American High Performance Seals assumes no obligation or liability for any advice furnished, or results obtained with respect to these products. All such advice is given and accepted at the buyer’s risk.
This information, based on our experience, is offered as part of our service to customers. It is intended for use by persons having technical skill, at their own discretion and risk. We do not guarantee favorable results, and we assume no liability in connection with its use.