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/AMS7338AEROSPACEMATERIALSPECIFICATIONAMS7338Issued 2013-02Rubber: Butyl (IIR Abbreviation)Phosphate Ester
5、 Resistant65 to 75 HardnessFor Seals In Hydraulic Systems, etc.RATIONALEAMS7338 is a new specification issued as no AMS7xxx O-ring specification for butyl exists.1. SCOPE1.1 FormThis specification covers a butyl rubber in the form of molded rings, compression seals, o-ring cord, and molded-in-place
6、gaskets for aeronautical and aerospace applications. As AMS3238 is no longer valid for O-rings. For O-rings, the requirements of AMS7338 shall be met wherever AMS3238 is specified.1.2 ApplicationThese products have resistance to phosphate ester fluids and/or low permeability to gases, but usage is n
7、ot limited to such applications. Not suitable for use in contact with petroleum-base fluids due to excessive swell. Each application should be considered separately. This Material Type has a typical service temperature range of -75 to +250 g113F (-59 to +121 g113C) in air.1.3 Safety Hazardous Materi
8、alsWhile 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 wi
9、th 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 DOCUMENTSThe issue of the following documents in effect on the date of the purchase order forms a part of this specification to t
10、he extent 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 AMS7338 Pa
11、ge 2 of 82.1 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 PackingsAMS3238 Butyl (IIR) Rubber Phosphate Ester Re
12、sistant 65-75AS568 Aerospace Size Standard for O-RingsAIR851 O-Ring Tension Testing CalculationsAS5752 Visual Inspection Standard for Elastomeric Sealing Elements Other than O-ringsAS2279 Tolerances, Rubber productsAS2810 Identification and Packaging, Elastomeric ProductsARP3050 Suitable Test Sizes
13、for O-ring Specifications2.2 ASQ PublicationsAvailable from American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203, Tel: 800-248-1946(inside USA and Canada) or +1-414-272-8575 (International), www.asq.org.ANSI/ASQ Z1.4 Sampling Procedures and Tables for Inspection by Attribut
14、es2.3 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor 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 395 Rubber Property - Compression Set Method BASTM D 471 Rubber Property - Effects of
15、LiquidsASTM D 573 Rubber Property - Deterioration in an Air OvenASTM D 1414 Rubber - Testing O-RingsASTM D 2240 Rubber Property - Durometer HardnessASTM D 412 Vulcanized Rubber and Thermoplastic Elastomers TensionASTM D 624 Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers
16、ASTM D 1149 Rubber Deterioration Cracking in an Ozone Controlled EnvironmentASTM D 2137 Rubber Property Brittleness Point of Flexible Polymers and Coated FabricsSAE AMS7338 Page 3 of 82.4 ISO PublicationsAvailable from International Organization for Standardization, 1, rue de Varembe, Casa Postale 5
17、6, CH-1211 Geneva 20,Switzerland, Tel: +41-11-749-01-11, www.iso.org.ISO 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: Quality Acceptance Criteria 2.5 PRI PublicationsAvailable from P
18、erformance Review Institute, 161 Thorn Hill Road, Warrrendale, PA 15086-7527, Tel: 724-772-1616, www.pri-network.org.PD2000 Procedures for an Industry Qualified Product Management ProcessPD2102 Aerospace Quality Assurance, Product Standards, Qualification Procedure, Elastomeric Seal3. TECHNICAL REQU
19、IREMENTS3.1 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 butyl elastomer, suitably cured to produce product meeting the requirements of 3.2. Material used shall be based on 100% virgin butyl
20、 elastomer. No reprocessed or non-butyl polymer is acceptable.3.2 PropertiesThe product shall conform to the requirements shown in Table 1; Calculations of tensile strength and elongation may be made in accordance with AIR851.SAE AMS7338 Page 4 of 8TABLE 1 PROPERTIESParagraph Property Requirements T
21、est Method3.2.1 As Received3.2.1.1 Hardness, Durometer “A“ 70 5 ASTM D 22403.2.1.2 Tensile Strength,minimum1500 psi(10.3 MPa)ASTM D 14143.2.1.3 Elongation, minimum 300 % ASTM D 14143.2.1.4 Tear Resistance, pounds force per inch (kN/m)80% of Preproduction ValueASTM D 624, Die B or C3.2.1.5 Specific G
22、ravity PreproductionValue 0.02ASTM D 2973.2.2 Phosphate Ester Resistance Immediate Deteriorated PropertiesASTM D 471Medium: Tri-n-butyl phosphateTemperature: 212 F 2100 C 1Time: 70 hours 0.53.2.2.1 Hardness Change, Durometer “A” 0 to -303.2.2.2 Tensile Strength Change, maximum -30%3.2.2.3 Elongation
23、 Change, maximum -20%3.2.2.4 Volume Change 0 to +30%3.2.3 Dry Heat Resistance ASTM D 573Temperature: 212 F 2100 C 1Time: 70 hours 0.53.2.3.1 Hardness Change, Durometer “A” 0 to +103.2.3.2 Tensile Strength Change, maximum -20%3.2.3.3 Elongation Change, maximum -40%3.2.4 Compression Set ASTM D 395, Me
24、thod BTemperature: 212 F 2100 C 1Time: 70 hours 3.2.4.1 Percent of Original Deflection, maximum 853.2.5 Low-Temperature Resistance ASTM D 2137, Method ATemperature: -31 F 2-35 C 1Time: 10 minutes 0.53.2.5.1 Brittleness Pass3.2.6 Weathering3.2.6.1 The product shall show no evidence of cracking when t
25、ested in accordance with ASTM D 1149 for seven days at 104 F 2 (40 C 1). Test specimens shall be prepared and mounted in accordance with ASTM D 1149, Method B2.3.3 QualityProduct, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign material as commercial
26、ly 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 than o-rings shall meet AS5752 Type 1 requirements.3
27、.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 and tolerances are shown in AS568. The procedures outlined in Annex B of ISO 3601-1 shall be followed for dimensional inspection.3
28、.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. SAE AMS7338 Page 5 of 83.6 QualificationProducts sold to this specification sh
29、all be listed on the PRI qualified products list, (QPL). The qualified products list shallbe in accordance with PD2000 (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 Qualification sha
30、ll be reapproved every three years in accordance with PD2000, PD2102 and the instructions from the Performance Review Institute. Testing shall be in accordance with 3.2.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for Inspection:The manufacturer of the product shall be responsible for performan
31、ce 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 ManufacturerShall be on the current PRI Qualified Manufacturers List (QML). 4.2 Classification of Tests4.2.1 Acceptance Tests4.2
32、.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 testing are shown in ARP3050. For all other sizes c
33、ompression 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 the testing was performed within 90 days of the man
34、ufacture of 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 testing4.2.1.2 Acceptance tests for all other seal geometriesSpeci
35、fic gravity and volume swell (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 long as the testing was performed within 90
36、days of the manufacture of 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 Acceptance TestsRequirement ParagraphHar
37、dness 3.2.1.1Tensile Strength 3.2.1.2Elongation 3.2.1.3Specific Gravity 3.2.1.5Compression Set 3.2.4Quality 3.3Sizes and Tolerances 3.4SAE AMS7338 Page 6 of 84.2.2 LotA quantity of one size of product processed and packaged as one production entity from a single batch.4.2.3 BatchA batch shall be the
38、 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 specified in the parts standard, drawing or purchase document. If not specified, product shall be taken at ra
39、ndom 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 TestsAll technical requirements shall be performed prior to the initial shipment of the product to a purchaser.
40、When a change in ingredients and/or processing requires reapproval, when purchaser deems confirmatory testing to be required, and for reapproval of qualification per 4.5.1.4.2.5.1 SampleShall be from a production batch/lot; AS568 size -214 o-rings shall be used for all testing.4.2.5.2 TestingShall b
41、e in accordance with PD2000 and PD2102. Verification tests shall consist of tests listed in Table 2 plus long term compression set (Table 1). Testing for qualification reapproval shall be all technical requirements (no verification tests arerequired).4.2.5.3 ReportThe supplier of the product shall m
42、ake 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 of all qualification tests.4.3 Inspection4.3.1 End of Process InspectionShall be as specified in the parts stan
43、dard, 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 requirements specified herein. Each individual part (100%) shall be visually inspected according to ISO 3601-3, Grade CS
44、 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, drawing or purchase document. If not specified, shall be as follows:The parts shall be visually inspected according to ISO 3
45、601-3, 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 in accordance with ANSI/ASQ Z1.4 single sampling plan inspection level II with an AQL 1.0 except that the acceptance number shal
46、l 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 any confirmatory inspection deemed necessary to ensure that the parts conform to the specified requirements.SAE AMS733
47、8 Page 7 of 84.4 Approval4.4.1 Manufacturer shall use ingredients, manufacturing procedures, processes, and methods of inspection on production products which are essentially the same as those used on the qualification sample. If any change in ingredients, in type of equipment for processing, or in
48、manufacturing procedures is necessary, manufacturer shall submit for reapproval a statement of the proposed changes in ingredients and/or processing and, when requested, sample product. Production product made by the revised procedure shall not be shipped prior to receipt of reapproval. 4.4.2 Manufa
49、cturer shall establish, for each size of seal, parameters for the process control factors which will produce seals meeting the technical requirements of this specification. These shall constitute the approved procedures and shall be used for manufacturing production of seals. If necessary to make any change in parameters for the process control factors, manufacturer shall submit
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