|Place of Origin:||Shanghai, China|
|Model Number:||backup rings|
|Minimum Order Quantity:||2000pcs|
|Packaging Details:||carton packing|
|Payment Terms:||T/T, Western Union, D/P, L/C|
|Supply Ability:||1000000PCS per month|
|Material:||Rubber PTFE||Size:||As568 Standard|
|Brand:||SHQN||Hardness:||90 Shore A|
|Item Name:||Backup Rings|
PTFE Backup Rings,
Rubber Contoured Backup Rings,
Extrusion Resistance Backup Rings
As568 Rubber Contoured PTFE Backup Rings 90 Shore A
In a sealing application, backup 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.
Extrusion failure is one of the most common types of o-ring failure. When the internal pressure of an application becomes too great, the o-ring will actually extrude into the clearance gap. This extrudate will quickly be nibbled away causing a loss of material, and once sufficient material is lost, seal failure will quickly follow.
There are three options to prevent this, the first of which is to reduce the clearances to lower the extrusion gap. This is obviously an expensive option, so a cheaper solution is to raise the durometer of the o-ring. Even though a higher durometer o-ring offers superior extrusion resistance, this is often not a feasible solution due to material availability, and to the fact that harder durometer materials have limited low-pressure sealing ability. The last and best option is the addition of a backup ring. A backup ring is a ring of hard, extrusion resistant material such as high-durometer Nitrile, ® (FKM), or PTFE.
A backup ring is designed to fit between the o-ring and the extrusion gap and prevent the extrusion of the o-ring. Depending upon the direction of pressure in the sealing application, you can either use one backup ring or two backup rings. If unsure, it is always best to use two backup rings per one o-ring.
Commenly all back up rings in in Nitrile 90 Durometer and FKM 90 Durometer.
We can also provide contoured backup rings in other materials by request.
Shanghai Qinuo can supply all American Standard Sizes for Backup Rings, details size, please contact our staff.
(PTFE) Backup Rings (VIRGIN PTFE 55 SHORE D) also available.
We also offer a large selection of PTFE Backup Rings including; Solid (uncut), Single Turn (scarf cut), and Spiral (multiturn) PTFE Backup Rings.
We Shanghai Qinuo Industry Main Products List:
Contact Person: Stary Xu