BACK-UP RINGS FLEXIBLE CUSTOM DESIGNS Whether you need a solid or scarf cut, rod, piston or another design to fit a certain gland specification, Greene, Tweed has the ability to handle any back-up ring request. Because of our emphasis on custom engineering to meet customers’ requests, we can design almost any type of back-up ring configu- ration to meet your needs. Back-up Ring material that Greene, Tweed sells. This ensures the best compromise between price and performance for your specific application. 4330/4340 SERIES Back-up Ring designed for use in AS5857 gland configurations as anti-extrusion devices in conjunction with O-rings, packings or other elastomeric seal types. A variety of high-performance materials can be provided and specifically targeted to meet the customer’s application Greene, Tweed’s 4270 series has been specifically designed for Greene, Tweed’s new 43 back-up ring series has been specifically Additionally, back-up rings can be manufactured in virtually any use in MIL-G-5514 gland configurations as anti-extrusion devices in conjunction with O-rings, packings or other elastomeric seal This series provides a part numbering system for back-up rings types. A variety of high-performance materials can be provided per the Aerospace Industry specifications AS5860 and AS5861, and specifically targeted to meet the customer’s application which are appropriate for use in static glands according to AS5857. The materials shall consist of filled PTFE (polytetraflouroethylene). AS5861 is the specification for solid-type rings. 4230/4240 SERIES This series provides a part numbering system for back-up rings as per the Aerospace specifications AS5781 and AS5782. These specifications are based on virgin but pigmented PTFE materials. AS5781 is the specification for scarf-cut (split) back-up rings while AS5782 is the specification for solid-type rings. Either is appropriate for use in AS4716 glands. © 2007, Greene, Tweed all rights reserved All trademarks are property of their respective owners. 04/07-GT DS-US-AS-009 The AS5860 specification is for scarf-cut (split) back-up rings while

4230/4240 SERIES PART NUMBERING SYSTEM The part numbering system requires the use of the material The part numbering system requires the use of the material designator table found below. For nonstandard designs contact designator table found below. For nonstandard designs contact Seal type R = rod P = piston 4.974 in. Bore diameter minimum Piston 1.241 in. Bore diameter minimum Avalon 04 solid Standard Notes: 1) Blue pigmented PTFE will be used for rod-type back-up rings (to material code 09 of AS5781/5782). 2) Yellow pigmented PTFE will be used for piston-type back-up rings (to material code...

4270 SERIES PART NUMBERING SYSTEM The part numbering system requires the use of the material designator table found below. For nonstandard designs contact GT engineering. 4270 Series Backups Seal type R = rod P = piston 4270 series for high pressure O-ring backups Back-up ring material designator 0 = Standard 1–9 = Nonstandard 00 = Standard 01–49 = Nonstandard 50 = MIL-G-5514 diameters with recommended static squeeze gland cross-section 51–99 = Nonstandard, static squeeze Part Numbering Example 4.974 in. Bore diameter minimum Piston MATERIAL Avalon 01 Avalon 07 Avalon 09 Avalon 44 Avalon 69 Avalon...