1、AEROSPACE MATERIAL SPECIFICATION AMS3238 REV. H Issued 1953-02 Reaffirmed 2001-04 Revised 2014-11 Superseding AMS3238H Butyl (IIR) Rubber Phosphate Ester Resistant 65 75 RATIONALE Forcible redirection to AMS7338 for O-rings and other compression seals deleted from AMS3238H since no other AMS3XXX spe
2、cification has such a forcible redirection. 1. SCOPE 1.1 Form This specification covers a butyl (IIR) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes. 1.2 Application This product has been used typically for parts such as grommets requiring resistance to phosphate esters or
3、 low permeability to gases, but usage is not limited to such applications. Not suitable for use in contact with petroleum-base fluids due to excessive swell. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in this specification may i
4、nvolve 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 safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the
5、 health and safety of all personnel involved. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific doc
6、ument 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 Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and
7、engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it
8、 may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2014 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechani
9、cal, 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: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. T
10、o provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS3238H SAE INTERNATIONAL AMS3238H Page 2 of 6 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-7
11、76-4970 (outside USA), www.sae.org. AMS2279 Tolerances, Rubber Products AMS2810 Identification and Packaging, Elastomeric Products 2.2 ASTM Publications Available 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
12、297 Rubber Products - Chemical Analysis ASTM D 395 Rubber Property - Compression Set ASTM D 412 Vulcanized Rubber and Thermoplastic Elastomers -Tension ASTM D 471 Rubber Property - Effect of Liquids ASTM D 573 Rubber - Deterioration in an Air Oven ASTM D 624 Tear Strength of Conventional Vulcanized
13、Rubber and Thermoplastic Elastomers ASTM D 1149 Rubber Deterioration - Cracking in an Ozone Controlled Environment ASTM D 2137 Rubber Property - Brittleness Point of Flexible Polymers and Coated Fabrics ASTM D 2240 Rubber Property - Durometer Hardness 3. TECHNICAL REQUIREMENTS 3.1 Material Shall be
14、a compound, based on a butyl (IIR) elastomer, suitably cured to produce a product meeting the requirements of 3.2. 3.2 Properties The product shall conform to the following requirements; tests shall be performed on the product supplied and in accordance with specified ASTM methods, insofar as practi
15、cable: SAE INTERNATIONAL AMS3238H Page 3 of 6 TABLE 1 - PROPERTIES Paragraph Property Requirement Methods 3.2.1 As Received 3.2.1.1 Hardness, Durometer “A” or equivalent 70 5 ASTM D 2240 3.2.1.2 Tensile Strength, minimum 1500 psi (10.3 MPa) ASTM D 412, Die B or C 3.2.1.3 Elongation, minimum 300% AST
16、M D 412, Die B or C 3.2.1.4 Tear Resistance pounds force per inch (N/m), minimum 80% of Preproduction Value ASTM D 624, Die B or C 3.2.1.5 Specific Gravity Preproduction Value 0.03 ASTM D 297 3.2.2 Phosphate Ester Resistance (Immediate Deteriorated Properties) ASTM D 471 Medium: Tri-n-butyl phosphat
17、e 3.2.2.1 Hardness Change, Durometer “A” or equivalent 0 to -30 Temperature: 212 F 2 (100 C 1) Time: 70 hours 0.5 3.2.2.2 Tensile Strength Change, maximum -30% 3.2.2.3 Elongation Change, maximum -20% 3.2.2.4 Volume Change 0 to +30% 3.2.3 Dry Heat Resistance ASTM D 573 Temperature: 212 F 2 (100 C 1)
18、Time: 70 hours 0.5 3.2.3.1 Hardness Change, Durometer “A” or equivalent 0 to +10 3.2.3.2 Tensile Strength Change, maximum -20% 3.2.3.3 Elongation Change, maximum -40% 3.2.4 Compression Set ASTM D 395, Method B Temperature: 212 F 2 (100 C 1) Time: 70 hours 0.5 3.2.4.1 Percent of Original Deflection,
19、maximum 85 3.2.5 Low-Temperature Resistance 3.2.5.1 Brittleness Pass ASTM D 2137, Method A Temperature: -31 F 2 (-35 C 1) Time: 10 minutes 0.5 3.2.6 Weathering The product shall show no evidence of cracking when tested in accordance with ASTM D 1149 for seven days at 104 F 2 (40 C 1). Test specimens
20、 shall be prepared and mounted in accordance with ASTM D 1149, Method B2. 3.3 Quality The product, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign materials as commercially practicable, and free from imperfections detrimental to usage of the product.
21、 SAE INTERNATIONAL AMS3238H Page 4 of 6 3.4 Tolerances Shall conform to all applicable requirements of AMS2279. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all r
22、equired 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 Tests 4.2.1 Acceptance Tests Tests for the following requirements are acceptance tests and shall be perf
23、ormed on each lot: TABLE 2 Requirement Paragraph Reference Hardness, as received 3.2.1.1 Tensile Strength, as received 3.2.1.2 Elongation, as received 3.2.1.3 Volume Change in oil 3.2.2.4 Compression Set 3.2.4 4.2.2 Preproduction Tests All technical requirements are preproduction tests and shall be
24、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, and when purchaser deems confirmatory testing to be required. 4.3 Sampling and Testing Shall be as follows: 4.3.1 For Acceptance Tests Sufficie
25、nt 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 procedure or, if not specified therein, not less than three. 4.3.1.1 If specimens cannot be prepared from the product, ASTM
26、test specimens prepared from the same batch and state of cure shall be used. When the product supplied is an extrusion of such shape that suitable test specimens cannot be cut from the product, a separate flat strip test sample from the same production lot shall be supplied upon request. This strip
27、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 cured in the same manner as production product. When the product is a molded shape from which test specime
28、ns cannot be cut, a slab 6 inches (152 mm) square by 0.075 inch 0.008 (1.90 mm 0.20) molded from the same batch of compound shall be supplied upon request. 4.3.1.2 A lot shall be all product from the same batch of compound processed in one continuous production run and presented for vendors inspecti
29、on at one time. An inspection lot shall not exceed 1000 pounds (454 kg) and may be packaged in smaller quantities and delivered under the basic lot approval provided lot identification is maintained. 4.3.1.3 A batch shall be the quantity of compound run through a mill or mixer at one time. SAE INTER
30、NATIONAL AMS3238H Page 5 of 6 4.3.1.4 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 report of 4.5 shall state that such plan was used. 4.3.2 For Preproduction Tests As agreed upon
31、by purchaser and vendor. 4.4 Approval 4.4.1 Sample product shall be approved by purchaser before product for production 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 sample. 4.4.2 Vendor s
32、hall use ingredients, manufacturing procedures, processes, and methods of inspection on production product which are essentially the same as those used on the approved sample product. If necessary to make any change in ingredients, in type of equipment for processing, or in manufacturing procedures,
33、 vendor 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. 4.5 Reports The vendor of the product shall furnish wit
34、h each shipment a report showing the results of tests to determine conformance to the acceptance test requirements and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, lot number, AMS3238H, vendors compound number, form and s
35、ize or 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 product may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retes
36、t specimen to meet the specified requirements shall be cause for rejection of the product represented and no additional testing shall be permitted. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Identification and Packaging Shall be in accordance with AMS2810. 6. ACKNOWLEDGM
37、ENT A vendor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Product not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (|)
38、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 revision of the document, including technical
39、revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. SAE INTERNATIONAL AMS3238H Page 6 of 6 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are pri
40、mary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.4 Purchase documents should specify not less than the following: AMS3238H Form and size or part number of product desired Quantity of product desired Acceptance standards and test method for corrosion (See 3.2.7). PREPARED BY AMS COMMITTEE “CE”
