SAE AS 5782A:2015 pdf free download – Retainers (Backup Rings), Hydraulic and Pneumatic, Polytetrafluoroethylene Resin, Solid, Un-Cut, For Use in AS4716 Glands
1 . SCOPE
This SAE Aerospace Standard (AS) covers solid, uncut polytetrafluoroethylene (PTFE) retainers (backup rings) for use in glands in accordance with AS471 6. They are for use in hydraulic and pneumatic system components as anti-extrusion devices in conjunction with O-rings, packings and other elastomeric seals for static and dynamic applications.
Because of the construction of groove dimensions, backup rings specific to rod applications are designated “R” – Rod (Female), backup rings specific to piston applications are designated “P” – Piston (Male). Piston and rod types of virgin pigmented PTFE are also identified by color code which also distinguishes parts to this standard from those made from virgin PTFE to other standards.
1 .1 Field of Application
Backup rings specified herein have been designed for a temperature range of -65 to 275 °F (-54 to 1 35 °C) and a nominal operating pressure of 3000 psi (20 694 kPa) for code 09 material (AMS3678/9). Alternate materials to AMS3678 are offered for more arduous operating conditions.
This specification includes material tests but does not include hydraulic or pneumatic performance tests.
2. REFERENCES
2.1 Applicable Documents
The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3.1 Metric Equivalents
Dimensions and properties in inch/pound/Fahrenheit units are primary; dimensions and properties in SI units are shown as the approximate equivalents of the primary units and are presented only for information.
3.2 Materials and Applications
3.2.1 Primary Material
Code 09, Virgin PTFE with pigment: Parts made to material code 09 of this standard shall conform to AMS3678/9,Pigmented Virgin PTFE, Molded.
-Parts made to material code 09 of this standard for “R” (Rod) applications shall be blue per AMS3678/9.
-Parts made to material code 09 of this standard for “P” (Piston) applications shall be yellow per AMS3678/9.
NOTE: Green pigmented material to AMS3678/9 is for use for “R” (Rod) backup rings to AS5860 and AS5861 . Brown pigmented material to AMS3678/9 is for use for “P” (Piston) backup rings to AS5860 and AS5861 .
Details of material specification, material code, color, composition, application and pressures for code 09 material applicable to this document are listed in Table 1 . Other data is for alternate materials or for reference only.
3.2.2 Alternate Materials
As indicated above, the AMS3678/9 is the primary material recommended for these backup rings because of their pigmented colors for identification. The other materials listed in Table 1 , except AMS3678/1 and AMS3678/4, can also be ordered by using the part identification numbers of this standard.
NOTE: When alternate materials are selected it is recommended that adequate performance for the application be verified by operational testing.