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 there
2、from, 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 2010 SAE International All rights reserved. No part of this publication m
3、ay 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 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS3253A AEROSPACE MATERIAL SPECIFICATION AMS3253 REV. A Issued 2001-02 Revised 2010-12 Super
5、seding AMS3253 Ethylene Propylene Rubber Phosphate Ester Resistant 65 - 75 RATIONALE AMS3253A is a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers an ethylene propylene elastomer in the form of molded sheet and shapes, color coded purple per ARP1527. 1.
6、2 Application This product has been used typically for parts such as tube supports, grommets, clamp cushions, and gaskets requiring resistance to phosphate ester hydraulic fluids, but usage is not limited to such applications. This material is not suitable for use in contact with hydrocarbon fuels a
7、nd oil or diester lubricating oils. Each application, however, should be considered individually. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification do
8、es 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 health and safety of all personnel involved. 2. APPLICABLE
9、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 document issue is specified. When the referenced document has b
10、een cancelled and no superseding document has been specified, the last published issue of that document shall apply. SAE AMS3253A 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 724-776
11、-4970 (outside USA), www.sae.org. AMS4943 Titanium Alloy, Hydraulic, Seamless Tubing, 3.0Al - 2.5V, Annealed ARP1527 Color Coding - Elastomers for Tube Clamp Cushions 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel:
12、 610-832-9585, www.astm.org. ASTM D 297 Standard Test Methods for Rubber Products - Chemical Analysis ASTM D 395 Standard Test Methods for Rubber Property - Compression Set ASTM D 412 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers -Tension ASTM D 471 Standard Test Methods f
13、or Rubber Property - Effect of Liquids ASTM D 573 Standard Test Methods for Rubber- Deterioration in an Air Oven ASTM D 624 Standard Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers ASTM D 2240 Standard Test Methods for Rubber Property - Durometer Hardness
14、 2.3 U.S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/. MIL-DTL-85052 Clamp, Loop, Cushion, General Specification for 3. TECHNICAL
15、 REQUIREMENTS 3.1 Material Shall be a compound based on an ethylene propylene elastomer, suitably cured to produce a product meeting the requirements of Table 1, and color coded purple in accordance with ARP1527. 3.2 Properties The product shall conform to the requirements in Table 1; tests shall be
16、 performed on product supplied and in accordance with specified ASTM methods, insofar as practicable. SAE AMS3253A Page 3 of 6 TABLE 1 - PROPERTIES Paragraph Property Requirement Test Method 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, mi
17、n 13.7 MPa (2000 psi) ASTM D 412, Die B or C 3.2.1.3 Elongation, min 400% ASTM D 412, Die B or C 3.2.1.4 Tear Resistance, min 34.7 kN/m (200 pounds force/inch) ASTM D 624, Die B 3.2.1.5 Specific Gravity Preproduction Value 0.02 ASTM D 297 3.2.2 Phosphate Ester Hydraulic Fluid Resistance ASTM D 471 A
18、S1241, Type IV, Class I, Grade A Temperature: 275 F 5 (135 C 3) Time: 22 hours 0.53.2.2.1 Hardness Change, Durometer “A” or equivalent -20 to 0 3.2.2.2 Tensile Strength Change, max -50% 3.2.2.3 Elongation Change, max -25% 3.2.2.4 Tear Resistance, max -40% 3.2.2.5 Volume Change 0 to +30% 3.2.3 Dry He
19、at Resistance ASTM D 573 Temperature: 275 F 5.4 (35 C 3) Time: 70 hours 0.53.2.3.1 Hardness Change, Durometer “A” or equivalent 0 to +10 3.2.3.2 Tensile Strength Change, max -20% 3.2.3.3 Elongation Change, max -40% 3.2.3.4 Tear Resistance, max -40% 3.2.3.5 Volume Change -10 to 0% 3.2.4 Compression S
20、et ASTM D 395, Method B Temperature: 212 F 5.4 (100 C 3) Time: 70 hours 0.53.2.4.1 Percent of Original Deflection, max 30 3.2.5 Thermal Shock No cracking, surface tackiness, or degradation MIL-STD-810 Method: 503.2 Low Temperatures: -65 F 5.4 (-54 C 3) High Temperatures: 275 F 5.4 (135 C 3) 3.2.6 Fl
21、ame Resistance - Horizontal Burn Test Use specimen 0.08 inch nominal thickness MIL-C-85052, paragraph 4.5.3.3.3 or FAA FAR 25.853,Appendix F 3.2.6.1 Burning rate; maximum 2.5 inches/max 3.2.7 Titanium Compatibility No cracking or pitting permitted MIL-C-85052, paragraph 3.5.1.4 and 4.5.3.4 SAE AMS32
22、53A Page 4 of 6 3.3 Quality The product, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign material as commercially practical, and free from imperfections detrimental to usage of the product. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspe
23、ction The manufacturer shall supply all samples 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 Tes
24、ts 4.2.1 Acceptance Tests Hardness (3.2.1.1), tensile strength (3.2.1.2), elongation (3.2.1.3), tear strength (3.2.1.4), and dry heat resistance (3.2.3) are acceptance tests and shall be performed on each lot. 4.2.2 Preproduction Tests All technical requirements are preproduction tests and shall be
25、performed prior to or on the initial shipment of product by the manufacturer, when any 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 Suffi
26、cient 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 form the product, AS
27、TM 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 str
28、ip 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 form which test spec
29、imens 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. 4.3.1.2 A lot shall be all product from the same batch of compound processed in one continuous run and presented for manufacturers insp
30、ection at one time. 4.3.1.3 A batch shall be the quantity of compound run through a mill or mixer at one time. 4.3.1.4 Final inspection Sampling Plan A statistical sampling plan acceptable to the purchaser may be used in lieu of sampling as in 4.3.1. Sample size for visual and dimensional requiremen
31、ts shall be as shown in Table 2; sample unit shall be one molded part and acceptance based on zero defects. SAE AMS3253A Page 5 of 6 TABLE 2 - VISUALL AND DIMENSIONAL INSPECTION Lot Size Sample Size 2 to 8 Entire Lot 9 to 90 8 91 to 150 12 151 to 280 19 281 to 500 21 501 to 1200 27 1201 to 3200 35 3
32、201 to 10 000 38 10 001 to 35 000 46 35 001 to 150 000 56 150 001 and Over 65 4.3.2 For Preproduction Tests Acceptable to purchaser or as stated in the contract. 4.4 Approval 4.4.1 Manufacturer shall establish for each size of part, parameters for the process control factors which will produce parts
33、 meeting the technical requirements of this specification. These shall constitute the approved procedures and shall be used for manufacturing production of parts. If necessary to make any changes in the parameters for process control factors, manufacturer shall submit for reapproval a statement of t
34、he proposed changes in ingredients, and/or processing. Products manufactured using a revised procedure shall be shipped prior to reapproval in writing. Manufacturer shall use ingredients, manufacturing procedures, processes, and methods of inspection, which are essentially the same as those used on
35、the approved sample. 4.4.1.1 Control factors for producing products include but are not limited to, the following: Compound ingredients and proportions thereof within established limits Sequence of mixing compound ingredients Type of mixing equipment Method and equipment for preparing preforms Basic
36、 molding procedure (compression, transfer, injection) Curing time and pressure; variations of 10% are permissible Finishing methods Methods of inspection 4.4.1.2 Any of the above process control factors for which parameters are considered proprietary by the manufacturer may be assigned a code design
37、ation. Each variation in such parameters shall be assigned a modified code designation. 4.5 Reports The supplier of the product shall furnish with each shipment a report from the manufacturer showing the results of tests to determine conformance to the acceptance test requirements and stating that t
38、he product conforms to the other technical requirements. This report shall include the purchase order number, lot number, AMS3253A, manufacturers identification number, part number, and quantity. 4.6 Resampling and Retesting If any specimen used in the above tests fails to meet the specified require
39、ments, 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 shall be cause for rejection of the product represented. Results of all tests shall be repor
40、ted. SAE AMS3253A Page 6 of 6 5. PREPARATION FOR DELIVERY 5.1 Packaging and Identification 5.1.1 A lot of product may be packaged in small quantities and delivered under the basic lot approval provided lot identification is maintained. 5.1.2 Each package shall be permanently and legibly marked with
41、not less than the following information: ETHYLENE PROPYLENE RUBBER AMS3253A PURCHASE ORDER NUMBER MANUFACTURERS IDENTIFICATION LOT NUMBER QUANTITY DATE OF SHIPMENT 6. ACKNOWLEDGMENT Supplier shall mention this specification number and its revision letter in all quotations and when acknowledging purc
42、hase 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 (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial c
43、hanges, 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 revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only
44、. 8.2 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; 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. 8.3 Purchase documents should specify not less than the following: AMS3253A Form and size or part number of product desired Quantity of product desired Special packaging, if required. PREPARED BY AMS COMMITTEE “CE”
