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All Seals Incorporated
The Sealing Specialists
2110 S. Yale Street
Santa Ana, CA 92704
Phone: (714) 556-4931
Fax: (714) 557-3257


BACKUP RINGS


Rubber
Teflon
Urethane
Parker 8-Dashs
Leather
Custom

 

We carry back-up rings (hard rubber, contoured back-up rings) for use with O-rings in high-pressure applications.

Pressure applied evenly to both sides of a seal normally has no effect on sealing performance. When a pressure difference is anticipated, elastomer selection must also consider differential pressure resistance. High differential pressures will cause improperly specified O-rings to extrude, resulting in seal damage and eventually failure.

Standard O-ring groove and gap dimensions cited in MIL-G-5514 and AS4873 generally provide adequate sealing for differential pressures to 1500 psi for all elastomers. Substantial improvement in extrusion resistance is attainable by 1) using harder O-rings, 2) decreasing the diametral clearance, or 3) using contoured hard rubber or plastic back-up rings. O-rings with high modulus and hardness are better able to resist extrusion. The higher the modulus of a material, the greater the force required to stretch it. Similarly, the harder the material, the greater its resistance is to indentation.

The following graph indicates conditions that result in O-ring extrusion with and without back-up rings.

Below is a list of our popular compounds for back-up rings. If you have any questions about our back-up rings, feel free to e-mail our sales staff at sales@allsealsinc.com. You may also contact a ALL SEALS customer service representative at (714) 556-4931.

Compound Elastomer Color Description

2067-90

Nitrile

Black

90-durometer nitrile; extrusion and abrasion resistant; high pressure resistant.

4900-90

Nitrile

Black

Low cost; general purpose; 90-durometer nitrile.

9009-90

Fluorocarbon

Black

90-durometer fluorocarbon; high-temperature resistant; AMS 7259 and AMS R 83248 and MIL R 83248 compliant; QPL-listed.

 


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