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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.Copyright 2012 SAE InternationalAll rights reserved. No part of this publication may b
3、e 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 (outside USA)Fax
4、: 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/AMS7272GAEROSPACEMATERIALSPECIFICATIONAMS7272 REV. GIssued 1957-07Reaffirmed 2001-08Revised 2013-04Supers
5、eding AMS7272FRubber: Butadiene-Acrylonitrile (NBR) Synthetic Lubricant Resistant65 75 HardnessFor Seals in Synthetic Lubricant SystemsRATIONALEService Liquid 101 is being replaced by Service Liquid 106 (ARM 200). This revision is intended to update AMS7272 in order to reflect the difference in volu
6、me change resulting from the change in test liquids. Acceptance tests have been defined for seal sizes other than those listed in ARP3050. A QPL requirement has been added.1. SCOPE1.1 FormThis specification covers a butadiene-acrylonitrile (NBR) rubber in the form of molded rings, compression seals,
7、 o-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications.1.2 ApplicationThese products have been used typically as sealing rings in contact with diester synthetic lubricants in service up 275 F (135 C), but usage is not limited to such applications. These products may no
8、t be suitable for use in high temperature stabilized, “HTS”, engine oils (those conforming to MIL-PRF-23699 Class HTS, MIL-PRF-7808 Grade 4 and AS5780 Class HPC). The cross-section of such rings is usually not over 0.275 inch (6.98 mm) in diameter or thickness.1.3 Safety - Hazardous MaterialsWhile t
9、he 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 saf
10、e 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 DOCUMENTSThe issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent
11、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 AMS7272G Page 2 of 9
12、2.1 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 PackingsAS568 Aerospace Size Standard for O-RingsAS5752 Aerosp
13、ace - Visual Inspection Standard for Elastomeric Sealing Elements Other than O-RingsAS5780 Specification for Aero and Aero-Derived Gas Turbine Engine LubricantsAIR851 O-Ring Tension Testing CalculationsARP3050 Suitable Test Sizes for O-ring Specifications2.2 ASTM PublicationsAvailable from ASTM Inte
14、rnational, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM D 395 Rubber Property - Compression SetASTM D 471 Rubber Property - Effect of LiquidsASTM D 573 Rubber - Deterioration in an Air OvenASTM D 1329 Evaluating Rubber Property - Retrac
15、tion at Lower Temperatures (TR Test)ASTM D 1414 Rubber O-RingsASTM D 2240 Rubber Property - Durometer Hardness2.3 ISO PublicationsAvailable from International Organization for Standardization , 1, rue de Varembe, Case postale 56, CH-1211 Geneva 20,Switzerland, Tel: +41-22-749-01-11, www.iso.org.ISO
16、3601-1 Fluid Power Systems O-Rings Part 1: Inside Diameters, Cross-sections, Tolerances and Designation CodesISO 3601-3 Fluid Power Systems O-Rings Part 3: Quality Acceptance Criteria2.4 PRI PublicationsAvailable from Performance Review Institute, 161 Thorn Hill Road, Warrrendale, PA 15086-7257, Tel
17、: 724-772-1616, www.pri-network.org.PD2000 Procedures for an Industry Qualified Product Management ProcessPD2102 Aerospace Quality Assurance, Product Standards, Qualification Procedure, Elastomeric SealSAE AMS7272G Page 3 of 92.5 ASQ PublicationsAvailable from American Society for Quality, 600 North
18、 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 Inspection by Attributes2.6 U.S. Government PublicationsAvailable from DLA Document Services, Building 4/D, 700 Robbins
19、 Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6396,http:/quicksearch.dla.mil/.MIL-PRF-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic BaseMIL-PRF-23699 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, NATO Code Number O-1563. TECHNICAL REQUIREMENTS3.1 MaterialShall be a compou
20、nd, based on a butadiene-acrylonitrile (NBR) elastomer, suitably cured to produce product meeting the requirements of 3.2.3.2 PropertiesProduct shall conform to the requirements shown in Table 1. Tests shall be performed in accordance with ASTM D 1414 unless otherwise indicated. Calculations for ten
21、sile strength, elongation, and tensile stress may be made in accordance with AIR851.TABLE 1 - PROPERTIESParagraph Property Requirement Method of Testing3.2.1 As Received3.2.1.1 Hardness, 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
22、Elongation, minimum 250% ASTM D14143.2.1.4 Tensile Stress at 100%Elongation, minimum500 psi(3.45 MPa)ASTM D14143.2.1.5 Corrosion Nil ASTM D 14143.2.1.6 Specific Gravity PreproductionValue 0.02ASTM D 2973.2.2 Synthetic LubricantResistance(Immediate DeterioratedProperties)Section 4.4.1 and ASTM D 471A
23、STM ServiceLiquid 106302 F 5(150 C 3)70 hours 0.53.2.2.1 Tensile StrengthChange, maximum-70%, butactual strengthshall be notlower than600 psi (4.14 MPa)SAE AMS7272G Page 4 of 9TABLE 1 - PROPERTIES (CONTINUED)3.2.2.2 Elongation Change,maximum -70%3.2.2.3 Volume Change 0 to +30%3.2.2.4 Decomposition N
24、one3.2.2.5 Surface Tackiness None3.2.3 Aromatic FuelResistance(Immediate DeterioratedProperties)ASTM D 471ASTM Ref. Fuel B68 to 86 F(20 to 30 C)70 hours 0.53.2.3.1 Tensile Strength Change,maximum (based onarea before immersion) -60%3.2.3.2 Elongation Change,maximum -55%3.2.3.3 Volume Change 0 to +35
25、%3.2.3.4 Volume Changeafter 70 hours 0.5immersion in 30%aromatic fuel followedby 48 hours 0.5 dryingat 158 F 2 (70 C 1),maximum (based onunimmersed volume) -10%3.2.4 Dry Heat Resistance ASTM D 573257 F 4(125 C 2)70 hours 0.53.2.4.1 Tensile StrengthChange, maximum -25%3.2.4.2 Elongation Change, maxim
26、um -50%3.2.4.3 Bend (flat) No crackingor checking3.2.5 Compression Set ASTM D 395 Method B257 F 4(125 C 2)70 hours 53.2.5.1 Percent of OriginalDeflection, maximumRing Cross SectionDiameter,0.066 to 0.110 inch(1.68 to 2.79 mm), inclOver 0.110 inch (2.79 mm)85753.2.6 Low-Temperature Resistance3.2.6.1
27、Temperature RetractionTR10point, maximum-15 F (-26 C)ASTM D 1329SAE AMS7272G Page 5 of 93.3 QualityProduct, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign material as commercially practicable, and free from internal imperfections detrimental to usag
28、e of the rings. Unless otherwise specified, surface imperfections shall be no greater than permitted by ISO3601-3 Grade CS. Unless otherwise specified, compression seals other than o-rings shall meet AS5752 Type 1 requirements.3.4 Sizes and TolerancesShall be as specified on the drawing. Standard si
29、zes are as shown in AS568. Inspection for conformance to dimensional requirements shall be made in accordance with ISO3601-1.3.5 QualificationProducts sold to this specification shall be listed on the PRI qualified products list, (QPL). The qualified products list shall be in accordance with PD2000
30、(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 until a PRI QPL is established.3.5.1 Qualification shall be reapproved every three years in accordance with PD2000, PD2102 and the instruction
31、s from the Performance Review Institute. Testing shall be in accordance with 4.2.5.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe manufacturer of the product shall be responsible for performance of all required tests. Purchaser reserves the right to sample and perform any testin
32、g deemed necessary to ensure that the product conforms to the AMS requirements.4.1.1 ManufacturerShall be on the current PRI Qualified Manufacturers List (QML).4.2 Classification of Tests4.2.1 Acceptance Tests4.2.1.1 Acceptance Tests for o-ringsRequirements shown in Table 2 are acceptance tests and
33、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 testing are shown in ARP3050. For all other sizes compression set and specific gravity tests shall be conducted on the end item or a sectio
34、n 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 the testing was performed within 90 days of the manufacture of the subject lot.Note: O-rings from the same lot which have not passed visual
35、 inspection but are otherwise expected to meet the physical properties of this specification may be used for specific gravity and compression set testing4.2.1.2 Acceptance tests for all other seal geometriesSpecific gravity and volume swell (Section 3.2.1.6 and 3.2.2.3) tests shall be conducted on t
36、he 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 the testing was performed within 90 days of the manufacture of the subject lot.Note: Parts from the same lot which h
37、ave 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.SAE AMS7272G Page 6 of 9TABLE 2 - ACCEPTANCE TESTSRequirement Paragraph ReferenceHardness, as received 3.2.1.1Tensile Strength,
38、as received 3.2.1.2Elongation, as received 3.2.1.3Specific Gravity 3.2.1.6Volume Change in Synthetic Lubricant 3.2.2.3Decomposition in Synthetic Lubricant 3.2.2.4Surface Tackiness in Synthetic Lubricant 3.2.2.5Compression Set 3.2.5Quality 3.3Sizes and Tolerances 3.44.2.2 LotA quantity of one size of
39、 product processed and packaged 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.4.2.4 Random SamplingThe method shall be as s
40、pecified in the parts 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 the applicable test procedure.4.2.5 Qualification Test
41、sAll 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 reapproval, when purchaser deems confirmatory testing to be required, and for reapproval of qualification per 3.5.1.4.2.5.1 SampleShall
42、be from a production 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 plus long term compression set (Table 1). Testing for qualification reapproval shall be al
43、l 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 results
44、of all qualification tests.SAE AMS7272G Page 7 of 94.3 Inspection4.3.1 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
45、conform to the requirements 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
46、 standard, drawing 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 sh
47、all be in accordance 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 sa
48、mple and perform any confirmatory inspection deemed necessary to ensure that the parts conform to the specified requirements.4.4 Test Methods4.4.1 Synthetic Lubricant ResistancePlace 140 mL of ASTM Service Liquid 106 (ASTM D 471) in 38 mm OD X 300 mm long test tubes at room temperature. Immerse test
49、 tubes in the heating medium so that 2 inches (51 mm) of each tube extends above the level of the heat transfer oil in oil bath heaters or so that 1 inch (25 mm) of each tube extends above the top insulation of aluminum block orair well heaters. Heat the test fluid to 302 F 5 (150 C 3). For rings 1 inch (25 mm) and under in nominal ID, hang three rings in each tube from corrosion-re
