1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: +1 724-776-4970
4、 (outside USA)Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AMS7266B AEROSPACEMATERIAL SPECIFICATIONAMS7266 REV. B Issued 1973-12 Revised 1990-04 Reaffirmed
5、2017-11 Superseding AMS7266A Rings, Sealing, Fluorocarbon Rubber General Purpose, High Temperature, Fuel and Oil Resistant 65 - 75 RATIONALE AMS7266B has been reaffirmed to comply with the SAE Five-Year Review policy. 1. SCOPE:1.1 Form: This specification covers a fluorosilicone rubber in the form o
6、f molded rings.1.2 Application: Primarily for use in applications requiring resistance to jet fuel and lubricating oil. The elevated test temperatures were selected as the maximum temperatures at which reproducible laboratory data could be obtained. These temperatures do not necessarily indicate, no
7、r are they to be construed as, the maximum operating temperatures at which these rings can be used. 1.3 Safety - Hazardous Materials: While the materials, methods, applications and processes described or referenced in this specification may involve the use of hazardous materials, this specification
8、does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.2. APPLICABLE
9、 DOCUMENTS:The following publications form a part of this specification to the extent specified herein. The latestissue of SAE publications shall apply. The applicable issue of other publications shall be the issue ineffect on the date of the purchase order.2.1 SAE Publications: Available from SAE,
10、400 Commonwealth Drive, Warrendale, PA 15096-0001.2.1.1 Aerospace Material Specifications: AMS 2817 Packaging and Identification, Preformed PackingsAMS 3021 Fluid Reference, for Testing Di-Ester (Polyol) Resistant Material2.1.2 Aerospace Standards: AS568 Aerospace Size Standard for O-RingsAS871 Manu
11、facturing and Inspection Standards for Preformed Packings (O-Rings)2.1.3 Aerospace Information Reports: AIR851 O-Ring Tension Testing Calculations2.2 ASTM Publications: Available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM D 471 Rubber Property - Effect of LiquidsASTM D 1414 Testin
12、g Rubber O-rings3. TECHNICAL REQUIREMENTS:3.1 Material: Shall be a compound, based on a fluorosilicone elastomer, suitably cured to produce sealing rings meeting the requirements of 3.2.3.2 Properties: Rings shall conform to the following requirements; tests shall be performed on the rings supplied
13、and, except as otherwise specified herein, in accordance with ASTM D 1414, insofar as practicable. Tensile strength testing is not required on rings which are too small to permit assembly on rollers and are, after cutting, too short to permit testing as a single strand. Eliminating testing for tensi
14、le strength does not eliminate testing for elongation; elongation test can be made by stretching a ring over a mandrel of a size which will stretch the ring sufficiently to produce the required elongation when figured on the ID of the ring. Calculations of tensile strength, elongation, and tensile s
15、tress may be made in accordance with AIR851.SAE INTERNATIONAL AMS7266B Page 2 of 7_ TABLE 13.2.1 As Received:3.2.1.1 Hardness, Durometer “A” or equivalent 70 53.2.1.2 Tensile Strength, minimum 750 psi(5.17 MPa)3.2.1.3 Elongation, minimum 125%3.2.1.4 Temperature Retraction,maximum -57 C (-71 F)3.2.1.
16、5 Corrosion Nil3.2.1.6 Specific Gravity PreproductionValue 0.033.2.2 Aromatic Fuel Resistance:(Immediate DeterioratedProperties)Medium: ASTM Ref. Fuel B(ASTM D 471)Temperature: 20 - 30 C(68 - 86 F)3.2.2.1 Hardness Change,Durometer “A” orequivalent -15 to 0Time: 22 hours 0.53.2.2.2 Tensile StrengthCh
17、ange, maximum -40%3.2.2.3 Elongation Change,maximum -35%3.2.2.4 Volume Change 0 to +20%3.2.3 Lubricating Oil Resistance:(Immediate DeterioratedProperties)Medium: AMS 3021Temperature: 150 C 3(302 F 5)Time: 70 hours 0.53.2.3.1 Hardness Change,Durometer “A” orequivalent 153.2.3.2 Tensile StrengthChange
18、, maximum -40%3.2.3.3 Elongation Change,maximum -25%3.2.3.4 Volume Change +1 to +15%3.2.3.5 Compression Set Changemaximum 30%SAE INTERNATIONAL AMS7266B Page 3 of 7_ 3.3 Quality: Rings, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign material as comme
19、rcially practicable, and free from internal imperfections detrimental to their performance. Surface imperfections shall be no greater than permitted by AS871 for minor defects.3.4 Sizes and Tolerances: Shall be as specified on the drawing. Standard sizes are shown in AS568. Inspection for conformanc
20、e to dimensional requirements shall be in accordance with AS871.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of rings shall supply all samples for vendors tests and shall be responsible for performing all required tests. Purchaser reserves the right to sample and to
21、 perform any confirmatory testing deemed necessary to ensure that the rings conform to the requirements of this specification.4.2 Classification of Tests: 4.2.1 Acceptance Tests: Tests for the following requirements are acceptance tests and shall be performed on each lot:3.2.4 Dry Heat Resistance: T
22、emperature: 200 C 3(392 F 5)3.2.4.1 Hardness Change,Durometer “A” orequivalent +10, -5Time: 70 hours 0.53.2.4.2 Tensile StrengthChange, maximum -25%3.2.4.3 Elongation Change,maximum -25%3.2.5 Compression Set:Change from OriginalDeflection, maximum 30%Temperature: 175 C 3(347 F 5)Time: 22 hours 0.253
23、.2.6 Low-Temperature Resistance:Temperature Retraction,TR10 point, maximum -57 C (-71 F)TABLE 1 (Continued)SAE INTERNATIONAL AMS7266B Page 4 of 7_ 4.2.2 Periodic Tests: Tests for the following requirements are periodic tests and shall be performed at a frequency selected by the vendor unless frequen
24、cy of testing is specified by purchaser:4.2.3 Preproduction Tests: Tests for all technical requirements are preproduction tests and shall be performed prior to or on the first-article shipment of rings to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.4.2, an
25、d when purchaser deems confirmatory testing to be required.4.2.3.1 For direct U.S. Military procurement, substantiating test data and, when requested, preproduction test material shall be submitted to the cognizant agency as directed by the procuring activity, contracting officer, or request for pro
26、curement.4.3 Sampling and Testing: Shall be as follows.4.3.1 For Acceptance Tests: Sufficient rings shall be taken at random from each lot to perform all required tests; the number of determinations for each requirement shall be as specified in the applicable test procedure or, if not specified ther
27、ein, not less than three.TABLE 2Requirement Paragraph ReferenceHardness, as received 3.2.1.1Tensile Strength, as received 3.2.1.2Elongation, as received 3.2.1.3Specific Gravity, as received 3.2.1.6TABLE 3Requirement Paragraph ReferenceCorrosion, as received 3.2.1.5Volume Change in fuel 3.2.2.4Tensil
28、e Strength Change in oil 3.2.3.2Elongation Change in oil 3.2.3.3Volume Change in oil 3.2.3.4Compression Set Change in oil 3.2.3.5Hardness Change after dry heat exposure 3.2.4.1Compression Set 3.2.5Temperature Retraction, TR10 point 3.2.6SAE INTERNATIONAL AMS7266B Page 5 of 7_ 4.3.1.1 A lot shall be
29、all rings from the same batch of compound processed in one continuous run and presented for vendors inspection at one time but shall not exceed 1000 rings or 100 pound (45 kg), whichever is the lesser mass. A lot may be packaged in smaller quantities and delivered under the basic lot approval provid
30、ed lot identification is maintained.4.3.1.2 A batch shall be the quantity of compound run through a mill or mixer at one time.4.3.1.3 When a statistical sampling plan has been agreed upon by purchaser and vendor, sampling shall be in accordance with such plan in lieu of sampling as in 4.3.1 and the
31、report of 4.5 shall state that such plan was used.4.3.2 For Periodic Tests and Preproduction Tests: As agreed upon by purchaser and vendor.4.4 Approval: 4.4.1 Sample rings shall be approved by purchaser before rings for production use are supplied, unless such approval be waived by purchaser. Result
32、s of tests on production rings shall be essentially equivalent to those on the approved sample rings.4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and methods of inspection on production rings which are essentially the same as those used on the approved sample rings. If ne
33、cessary to make any change in ingredients, in type of equipment for processing, or in manufacturing procedures, vendor shall submit for reapproval a statement of the proposed changes in ingredients and/or processing and, when requested, sample rings. Production rings made by the revised procedure sh
34、all not be shipped prior to receipt of reapproval.4.5 Reports: The vendor of rings shall furnish with each shipment a report showing the results of tests to determine conformance to the acceptance test requirements and, when performed, to the periodic test requirements, and stating that the rings co
35、nform to the other technical requirements. This report shall include the purchase order number, lot number, AMS 7266B, vendors compound number, part number, and quantity.4.6 Resampling and Retesting: If any specimen used in the above tests fails to meet the specified requirements, disposition of the
36、 rings may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the rings represented and no additional testing shall be permitted. Results of all test
37、s shall be reported.5. PREPARATION FOR DELIVERY: 5.1 Packing and Marking: Shall be in accordance with AMS 2817 or other method acceptable to purchaser.SAE INTERNATIONAL AMS7266B Page 6 of 7_ 6. ACKNOWLEDGMENT: A vendor shall mention this specification number and its revision letter in all quotations
38、 and when acknowledging purchase orders.7. REJECTIONS: Rings not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection.8. NOTES:8.1 A change bar ( l ) located in the left margin is for the convenience of the user in locating areas where technical
39、 revisions, not editorial changes, have been made to the “C” revision of this specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technical revisions. Change bars and (R) are not used in original publications, nor in specificat
40、ions that contain editorial changes only.8.2 Dimensions and properties in inch/pound units and the Celsius temperatures are primary; dimensions and properties in SI units and the Fahrenheit temperatures are shown as the approximate equivalents of the primary units and are presented only for informat
41、ion.8.3 For direct U.S. Military procurement, purchase documents should specify not less than the following: Title, number, and date of this specificationSize or part number of rings desiredQuantity of rings desiredLevel A packaging, if required (See AMS 2817).8.4 Rings meeting the requirements of this specification have been classified under Federal Supply Classification (FSC) 5330.PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “CE”SAE INTERNATIONAL AMS7266B Page 7 of 7_
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