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 theref
2、rom, 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 2012 SAE InternationalAll rights reserved. No part of this publi
3、cation 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 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS7274JAEROSPACEMATERIALSPECIFICATIONAMS7274 REV. JIssued 1949-03Revised 2014-05Superseding
5、AMS7274HRubber: Butadiene-Acrylonitrile (NBR)65 to 75 Hardness,For Elastomeric Seals in Aircraft Engine Oil SystemsRATIONALEAMS7274J results from a Five Year Review and update of this specification. Qualification requirements have been added.1. SCOPE1.1 FormThis specification covers a butadiene-acry
6、lonitrile (NBR) rubber in the form of molded rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications.1.2 ApplicationThese products have resistance to hot-petroleum-based lubricating oil, but usage is not limited to such applications. Each applic
7、ation should be considered separately. This Butadiene-acrylonitrile (NBR) has a typical service temperature range of -67 to +302 F (-55 to +150 C) in engine oil.1.2.1 The cross-section of such seals is usually not over 0.275 inch (6.98 mm) in diameter or thickness.1.3 Safety - Hazardous MaterialsWhi
8、le the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification 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
9、 safe and proper use of any hazardous materials and to takenecessary precautionary measures to ensure the health and safety of all personnel involved.2. APPLICABLE DOCUMENTSThe issue of the following documents in effect on the date of the purchase order forms a part of this specification to the exte
10、nt specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply.SAE AMS7274J Page 2 o
11、f 92.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2817 Packaging and Identification, Preformed PackingsAIR851 O-Ring Tension Testing CalculationsARP3050 S
12、uitable Test Sizes for O-ring SpecificationsAS568 Aerospace Size Standard for O-ringsAS3570 Packing, Preformed - O-ring Seal, AMS 7274AS5752 Aerospace - Visual Inspection Standard for Elastomeric Sealing Elements Other than O-Rings2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harb
13、or Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM D 297 Rubber Products- Chemical AnalysisASTM D 471 Rubber Property - Effects of LiquidsASTM D 1414 Rubber - Testing O-RingsASTM D 2240 Rubber Property Durometer Hardness2.3 ISO PublicationsAvailable from
14、International Organization for Standardization (ISO), 1, ch. De la Voie-Creuse, CP 56, CH-1211 Geneva 20,Switzerland or www.iso.orgISO 3601-1 Fluid Power Systems- O-rings Part 1: Inside diameter, cross sections, tolerances and size identification codeISO 3601-3 Fluid Power Systems O-rings Part 3: Qu
15、ality Acceptance Criteria2.4 PRI PublicationsAvailable from Performance Review Institute, 161 Thorn Hill Road, Warrendale, PA 15086-7527, Tel: 724-772-1616, www.pri-network.org.PD 2000 Procedures for an Industry Qualified Product Management ProcessPD2102 Aerospace Quality Assurance, Product Standard
16、s, Qualification Procedure, Elastomeric Seal2.5 ASQ PublicationsAvailable from American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203, Tel: 800-248-1946(United States or Canada) or +1-414-272-8575 (International), www.asq.org.ANSI/ASQ Z1.4 Sampling Procedures and Tables for I
17、nspection by AttributesSAE AMS7274J Page 3 of 93. TECHNICAL REQUIREMENTS3.1 MaterialShall be prepared from ingredients as shall be necessary to achieve the requirements detailed in this standard and shall be a compound, based on a butadiene-acrylonitrile (NBR) elastomer, suitably cured to produce pr
18、oduct meeting the requirements of 3.2. Material used shall be based on 100% virgin butadiene-acrylonitrile elastomer. No reprocessed or non-butadiene-acrylonitrile polymer is acceptable.3.2 PropertiesThe product shall conform to the requirements shown in Table 1; calculations of tensile strength and
19、 elongation may be made in accordance with AIR851.TABLE 1 TEST REQUIREMENTSParagraph Test Requirement Test Method / Conditions3.2.1 Original Properties3.2.1.1 Hardness Change, Durometer “A”or equivalent70 5 ASTM D 22403.2.1.2 Tensile Strength,minimum 1500 psi(10.3 MPa)ASTM D 14143.2.1.3 Elongation,
20、minimum 150% ASTM D 14143.2.1.4 Corrosion Nil ASTM D 14143.2.1.5 Specific Gravity Preproduction Value0.02ASTM D 297, hydrostatic method3.2.2 Lubricating Oil Resistance(Immediate Deteriorated Properties)Medium: IRM 901 Oil(ASTM D 471) Temperature: 302 F 5(150 C 3)3.2.2.1 Hardness Change, Durometer “A
21、“ or equivalent -5 to +10 Time: 96 hours 0.5 3.2.2.2 Tensile Strength Change, maximum -60% 3.2.2.3 Elongation Change, maximum -50%3.2.2.4 Volume Change 0 to +10 3.2.2.5 Decomposition None 3.2.2.6 Surface Tackiness None 3.2.3 Processing Oil Resistance(Immediate Deteriorated Properties)Medium: IRM 903
22、 Oil(ASTM D 471)Temperature: 302 F 5(150 C + 3)3.2.3.1 Hardness Change, Durometer “A“ or equivalent -20 to 0 Time: 70 hours 0.5 3.2.3.2 Volume Change +25 to +45% SAE AMS7274J Page 4 of 93.2.3.3 Decomposition None 3.2.3.4 Surface Tackiness None 3.2.4 Dry Heat Resistance Temperature: 212 F 2(100 C 1)
23、3.2.4.1 Hardness Change, Durometer “A“ or equivalent 0 to +10 Time: 70 hours 0.5 3.2.4.2 Tensile Strength Change,maximum -25% 3.2.4.3 Elongation Change, maximum -40%3.2.4.4 Bend (Flat) No cracking or checking 3.2.5 Compression Set Temperature: 257 F 4(125 C 2) 3.2.5.1 Percent of Original Deflection,
24、 maximum Ring Cross Section Diameter 0.066 to 0.110 inch (1.68 to 2.79 mm), incl Over 0.110 inch (2.79 mm) 8575Time: 70 hours 0.5 3.2.6 Low-Temperature Brittleness(After Aging in Lubricating OilNo Cracking 4.4.13.3 QualityProduct, as received by purchaser, shall be uniform in quality and condition,
25、smooth, as free from foreign material as commercially practicable, and free from internal imperfections detrimental to usage of the seals. Unless otherwise specified, surface imperfections shall be no greater than permitted by ISO3601-3 grade CS. Unless otherwise specified, compression seals other t
26、han O-rings shall meet AS5752 Type 1 requirements.3.4 Dimensions and TolerancesDimensions and tolerances shall be as specified in the parts standard, drawing, or purchase document. If not specified, O-rings standard sizes are as shown in AS568. The procedures outlined in Annex B of ISO 3601-1 shall
27、be followed for dimensional inspection.3.5 Toxicological FormulationsThe material shall have no adverse effects on the health of personnel when used for its intended purpose in accordance with manufacturers instructions and with appropriate handling procedures.3.6 QualificationProducts sold to this
28、specification shall be listed on the PRI qualified products list, (QPL). The qualified products list shall be in accordance with PD 2000 (See 8.2). If no products are listed on the PRI qualified products list, then product qualification shall be as agreed between the purchaser and manufacturer.3.6.1
29、 Qualification shall be reapproved every 3 years in accordance with PD 2000, PD2102 and the instructions from the Performance Review Institute. Testing shall be in accordance with 4.2.2.SAE AMS7274J Page 5 of 94. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe manufacturer of the pr
30、oduct shall be responsible for performance of all required tests. Purchaser reserves the right to sample and perform any testing deemed necessary to ensure that the product conforms to the AMS requirements.4.1.1 Manufacturer shall be on the current PRI Qualified Manufacturers List (QML)4.2 Classific
31、ation of Tests4.2.1 Acceptance Tests4.2.1.1 Acceptance Tests for O-ringsRequirements shown in Table 2 are acceptance tests and shall be performed on each lot. Acceptance tests shall be performed on the rings supplied and in accordance with ASTM D 1414. O-ring sizes that are suitable for test shall b
32、e in accordance with ARP3050. For all other sizes compression set and specific gravity tests shall be conducted on the end item or a section removed from the end item. Testing performed on a size -214 O-ring of the same batch and state of cure shall satisfy the remaining acceptance tests as long as
33、the parts were molded within 90 days of the molding the subject lot.NOTE: O-rings from the same lot which have not passed visual inspection but are otherwise expected to meet the physical properties of this specification may be used for specific gravity and compression set testing.4.2.1.2 Acceptance
34、 Tests for All Other Seal GeometriesSpecific gravity and volume change (3.2.1.5 and 3.2.2.4) tests shall be conducted on the end item or a section removed from the end item. Testing performed on a size -214 O-ring of the same batch and state of cure shall satisfy the remaining acceptance tests as lo
35、ng as the parts were molded within 90 days of the molding the subject lot. NOTE: Parts from the same lot which have not passed visual inspection but are otherwise expected to meet the physical properties of this specification may be used for specific gravity and volume swell testing.TABLE 2 ACCEPTAN
36、CE TESTSRequirement Paragraph ReferenceHardness 3.2.1.1 Tensile Strength 3.2.1.2 Elongation 3.2.1.3 Specific Gravity 3.2.1.5 Volume Change in lubricating oil 3.2.2.4 Decomposition in lubricating oil 3.2.2.5 Surface Tackiness in lubricating oil 3.2.2.6 Compression Set 3.2.5 Quality 3.3Sizes and Toler
37、ances 3.44.2.2 LotA quantity of one size of product processed as one production entity from a single batch.4.2.3 BatchA batch shall be the quantity of compound run through a mill or mixer at one time. Excluded from the definition is mixing of batches of previously compounded material.SAE AMS7274J Pa
38、ge 6 of 94.2.4 Random SamplingThe method shall be as specified in the part standard, drawing or purchase document. If not specified, product shall be taken at random from each lot to perform all the required acceptance tests. The number of test iterations for each requirement shall be specified in t
39、he applicable test procedure.4.2.5 Qualification TestsAll technical requirements shall be performed prior to the initial shipment of the product to a purchaser when a change in ingredients and/or processing requires approval, when purchaser deems confirmatory testing to be required, and for reapprov
40、al of qualification per 3.6.1.4.2.5.1 SampleShall be from a product batch/lot. AS568 size -214 O-rings shall be used for all testing.4.2.5.2 TestingShall be in accordance with PD 2000 and PD 2102. Verification tests shall consist of tests listed in Table 2. Testing for qualification reapproval shall
41、 be all technical requirements (no verification tests are required).4.2.5.3 ReportThe supplier of the product shall make a qualification test report available. This report shall include AMS number, manufacturers identification and product designation, batch/lot number, date of manufacture and the re
42、sults of all qualification tests. 4.3 Inspection:4.3.1 End of Process InspectionShall be as specified in the parts standard, drawing or purchase document. If not specified, shall be as follows:Prior to inspection, mold flash shall be removed from the parts in such a manner that they conform to the r
43、equirements specified herein. Each individual part (100%) shall be visually inspected according to ISO 3601-3, Grade CS or AS5752 as applicable, using 1X magnification. The entire surface of the part shall be manually inspected.4.3.2 Final InspectionShall be as specified in the parts standard, drawi
44、ng, or purchase document. If not specified, shall be as follows:The parts shall be visually inspected according to ISO 3601-3, Grade CS or AS5752, as applicable, using 2X magnification. The entire surface of the part shall be manually inspected. The sample size for final inspection shall be inaccord
45、ance with ANSI/ASQ Z1.4 single sampling plan inspection level II with an AQL 1.0 except that the acceptance number shall be zero. The sample unit shall be one part. The manufacturer of the parts shall be responsible for the required inspections. The purchaser reserves the right to sample and perform
46、 any confirmatory inspection deemed necessary to ensure that the parts conform to the specified requirements.SAE AMS7274J Page 7 of 94.4 Test Methods4.4.1 The specimen for rings 2 inches (51 mm) and under in nominal ID shall be a complete ring; the specimen for rings over 2 inches (51 mm) in nominal
47、 ID shall be a piece 3 inches (76 mm) long cut from a ring. The specimen shall be immersed in lubricating oil in accordance with 3.2.2 and, after cooling in air to room temperature, shall be placed in a refrigerator at -40 C 1 (-40 F 2) and held at that temperature for 5 hours 0.1. At the end of the
48、 refrigeration time, the specimen, while in the refrigerator or within 10 seconds after removal from the refrigerator, shall withstand, without cracking, bending as follows: The complete ring shall be ovalized until the minor axis is equal to 50% of the original ID, and the 3-inch (76-mm) specimen s
49、hall be bent around to form a circle.4.5 Approval4.5.1 Manufacturer shall use ingredients, manufacturing procedures, processes, and methods of inspection in production which are essentially the same as those used on the approved sample. If any change in ingredients, in type of equipment for processing, or in manufacturing procedures is necessary, manufacturer shall submit for reapprova
