Xiamen Seals Technology Co.,Ltd
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Xiamen Seals Technology Co.,Ltd
Address: Unit233, No.273, Lingxia North RD, Huli High technology District, Xiamen, China
Tel: +86-592-5775761
Fax: +86-592-5775761
E-mail: info@sealsmanufacturer.com

Back Up Rings

EPDM 90 Durometer Backup Ring

EPDM 90 Durometer Backup Ring

EPDM 90 Durometer Backup Ring back-up rings help prevent extrusion in high pressure service and compensate for loose fi tting parts. The use of loose fi tting parts makes for cost reduction in the machining of unit components....
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EPDM 90 Durometer Backup Ring

A back-up ring is a rigid ring that holds an elastomeric seal or plastic (such as Polyethylene) connection to its designed shape and in its correct place. Back up rings are commonly used with O-rings, lip seals, and as reciprocating shaft seals. They are also used for piping connections joining two different materials - typically one flexible and one rigid.

Rubber Contoured Back-Up Ring Size Chart

Contoured back-ups are routinely produced in a 90 durometer nitrile. This provides sufficient elasticity to permit stretching over the major diameter of a piston and then snapping back into the gland groove cut into the piston. 90 durometer has sufficient hardness to resist extrusion of the softer elastomeric O-ring performing the actual sealing function against the high pressure liquid or gas.

000 Series O-rings 0.070" ±0.003" - .045" Thick

100 Series O-rings 0.103" ±0.003" - .045" Thick

200 Series O-rings 0.139" ±0.004" - .040" Thick

300 Series O-rings 0.210" ±0.005" - .060" Thick

400 Series O-rings 0.275" ±0.006" - .096" Thick

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