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 2011 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/AMS3212PAEROSPACEMATERIALSPECIFICATIONAMS3212 REV. PIssued 1942-12Reaffirmed 1998-08Revised 2014-03Supers
5、eding AMS3212NAcrylonitrile Butadiene (NBR) RubberAromatic Fuel Resistant55 - 65RATIONALEAMS3212P is a Five Year Review and update of this specification.1. SCOPE1.1 FormThis specification covers a nitrile (NBR) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes.1.2 Application
6、These products have been used typically for parts, such as gaskets, diaphragms, bushings, grommets, and sleeves, requiring resistance to aromatic and aliphatic fuels when continuously or alternately exposed to both, but usage is not limited to such applications.1.3 Safety - Hazardous MaterialsWhile
7、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 sa
8、fe 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
9、 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 AMS3212P Page 2 of
10、62.1 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.AMS2279 Tolerances, Rubber ProductsAMS2810 Identification and Packaging, Elastomeric Products2.2 ASTM Publica
11、tionsAvailable 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 Standard Test Methods for Rubber Products - Chemical AnalysisASTM D 395 Standard Test Methods for Rubber Property - Compression SetASTM D 412 Sta
12、ndard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers - TensionASTM D 471 Standard Test Methods for Rubber Property - Effect of LiquidsASTM D 518 Standard Test Methods for Rubber Deterioration - Surface CrackingASTM D 573 Standard Test Methods for Rubber Deterioration in an Air OvenA
13、STM D 624 Standard Test Methods for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic ElastomersASTM D 1149 Standard Test Methods for Rubber Deterioration - Cracking in an Ozone Controlled Environment ASTM D 2137 Standard Test Methods for Rubber Property - Brittleness Point of Flexib
14、le Polymers and Coated FabricsASTM D 2240 Standard Test Methods for Rubber Property - Durometer Hardness3. TECHNICAL REQUIREMENTS3.1 MaterialShall be a compound, based on an acrylonitrile-butadiene (NBR) elastomer, suitably cured to produce a product meeting the requirements of 3.2.3.2 PropertiesThe
15、 product shall conform to requirements shown in Table 1, tests shall be performed on the product supplied and in accordance with specified ASTM methods, insofar as practicable.SAE AMS3212P Page 3 of 6TABLE 1 - PROPERTIESParagraph Property Requirement Test Methods3.2.1 Hardness, Durometer “A”or equiv
16、alent 60 5ASTM D 22403.2.2 Tensile Strength, minimum 1700 psi(11.7 MPa)ASTM D 412, Die B or C3.2.3 Elongation, minimum 300% ASTM D 412, Die B or C3.2.4 Tensile Stress at 100%Elongation, maximum650 psi(4.48 MPa)ASTM D 412, Die B or CStretch specimen twiceto 125% elongationwithin 5 minutesbefore testi
17、ng.3.2.5 Tear Resistance, minimum 100 pounds forceper inch(17.5 kN/m)ASTM D 624, Die B3.2.6 Specific Gravity PreproductionValue 0.02ASTM D 2973.2.7 Aliphatic Fuel Resistance(After 24 hours drying at158 F 2 (70 C 1)ASTM D 471ASTM Ref. Fuel A68 to 86 F (20 to 30 C)3.2.7.1 Volume Change, maximum -5% 24
18、 hours 0.53.2.8 Aromatic Fuel Resistance(Immediate Deteriorated Properties)ASTM D 471ASTM Ref. Fuel B68 to 86 F (20 to 30 C)3.2.8.1 Hardness Change,Durometer “A” orequivalent-20 to 0166 hours 0.53.2.8.2 Tensile Strength Change,maximum3.2.8.2.1 For parts other thanextrusions -50%3.2.8.2.2 For extrude
19、d parts -60%3.2.8.3 Elongation Change,maximum-50%3.2.8.4 Volume Change in24 hours 0 to + 50%3.2.8.5 Volume Change in166 hours 0 to + 50%3.2.8.6 Volume Change on Drying(after 166 hours immersion)at 158 F 2 (70 C 1)for 24 hours, maximum-5%3.2.9 Dry Heat Resistance ASTM D 573212 F 2 (100 C 1)Durometer
20、“A” or70 hours 0.53.2.9.1 Hardness Changeequivalent 0 to + 103.2.9.2 Tensile Strength Change,maximum -20%SAE AMS3212P Page 4 of 6TABLE 1 - PROPERTIES (Continued)Paragraph Property Requirement Test Methods3.2.9.3 Elongation Change,maximum 50%3.2.10 Compression Set ASTM D 395, Method B212 C 2(100 C 1)
21、70 hours 0.53.2.10.1 Percent of OriginalDeflection, maximum3.2.10.1.1 For parts other thanextrusions 503.2.10.1.2 For extruded parts 673.2.11 Low-Temperature Resistance3.2.11.1 Brittleness Pass ASTM D 2137, Method A0 F 2(-18 C 1)10 minutes 13.2.12 Weather ResistanceThe product shall show no evidence
22、 of cracking when tested 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 518, Method B.3.3 QualityThe product, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign m
23、aterials as commercially practicable, and free from imperfections detrimental to usage of the product.3.4 TolerancesShall conform to all applicable requirements of AMS2279.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe vendor of the product shall supply all samples for vendors t
24、ests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements.4.2 Classification of Tests4.2.1 Acceptance TestsTests for requiremen
25、ts shown in Table 2 are acceptance tests and shall be performed on each lot.TABLE 2 - ACCEPTANCE TESTSRequirement Paragraph ReferenceHardness 3.2.1Tensile Strength 3.2.2Elongation 3.2.3Specific Gravity 3.2.6Compression Set 3.2.10Tolerances 3.4SAE AMS3212P Page 5 of 64.2.2 Periodic TestsTests for req
26、uirements shown in Table 3 are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser.TABLE 3 - PERIODIC TESTSRequirement Paragraph ReferenceTensile Stress at 100% Elongation 3.2.4Tear Resistance 3.2.5Volume Change in Aliphat
27、ic Fuel 3.2.7.1Volume Change in Aromatic Fuel 3.2.8.44.2.3 Preproduction TestsAll technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of the product to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.4.2, a
28、nd when purchaser deems confirmatory testing to be required.4.3 Sampling and Testing4.3.1 For Acceptance TestsSufficient product 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 proced
29、ure or, if not specified therein, not less than three.4.3.2 If specimens cannot be prepared from the product, ASTM test specimens prepared from the same batch and state of cure shall be used. When the product is an extrusion of such shape that suitable test specimens cannot be cut from the product,
30、a separate flat strip test sample from the same production lot shall be supplied upon request. This strip shall be prepared from tubing 1.000 inch 0.063 (25.40 mm 1.60) in OD by 0.075 inch 0.008 (1.90 mm 0.20) in wall thickness, mechanically slit and flattened into a strip while being extruded, and
31、cured in the same manner as production product. When the product is a molded shape from which test specimens cannot be cut, a slab 6 inches (152 mm) square by 0.075 inch 0.008 (1.90 mm 0.20) thick, molded from the same batch of compound, shall be supplied upon request.4.3.3 A lot shall be all produc
32、t from the same batch of compound processed in one continuous run and presented for vendors inspection at one time.4.3.4 A batch shall be the quantity of compound run through a mill or mixer at one time.4.3.5 When a statistical sampling plan has been agreed upon by purchaser and vendor, sampling sha
33、ll be in accordance with such plan in lieu of sampling as in 4.3.1 and the report of 4.5 shall state that such plan was used.4.3.6 For Periodic Tests and Preproduction TestsAs agreed upon by purchaser and vendor.4.4 Approval4.4.1 Sample product shall be approved by purchaser before product for produ
34、ction use is supplied, unless such approval be waived by purchaser. Results of tests on production product shall be essentially equivalent to those on the approved samples.4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and methods of inspection on production product which a
35、re essentially the same as those used on the approved sample. If necessary 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 request
36、ed, sample product. Production product made by the revised procedure shall not be shipped prior to receipt of reapproval.SAE AMS3212P Page 6 of 64.5 ReportsThe vendor of the product shall furnish with each shipment a report showing the results of tests to determine conformance to the acceptance test
37、 requirements and, when performed, to the periodic test requirements, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, lot number, AMS3212P, vendors compound number, form and size or part number, and quantity.4.6 Resampli
38、ng and RetestingIf any specimen used in the above tests fails to meet the specified requirements, disposition of the product 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 s
39、hall be cause for rejection of the product represented. Results of all tests shall be reported.5. PREPARATION FOR DELIVERY5.1 Identification and PackagingShall be in accordance with AMS2810.5.1.1 A lot of product may be packaged in small quantities and delivered under the basic lot approval provided
40、 lot identification is maintained.6. ACKNOWLEDGMENTA vendor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specification, or to modifications authorized by purchaser, will be subject
41、 to rejection.8. NOTES8.1 A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete rev
42、ision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.8.2 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units a
43、nd the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information.8.3 Purchase documents should specify not less than the following:AMS3212PForm and size or part number of product desiredQuantity of product desiredInspection requirements.PREPARED BY AMS COMMITTEE “CE“
