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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this p
3、ublication may 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: +1 724-776-497
4、0 (outside USA) 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/AMS7259E AEROSPACE MATERIAL SPECIFICATION AMS7259 REV. E Issued 1983-01 Revised 2
5、013-05 Superseding AMS7259D Rubber: Fluorocarbon (FKM) High Temperature/Fluid Resistant Low Compression Set/ 85 to 95 Hardness For Seals In Fuel Systems and Specific Engine Oil Systems RATIONALE AMS7259E results from a five year review and update of this specification to align with the O-ring templa
6、te. 1. SCOPE 1.1 Form This specification covers a fluorocarbon (FKM) rubber in the form of O-rings, O-ring cord, compression seals, and molded-in-place gaskets for aeronautical and aerospace applications. 1.2 Application These products have been used typically as sealing rings, compression seals, O-
7、ring cord, and molded-in-place gaskets in contact with air and a wide variety of fuels, lubricants, and specific hydraulic fluids but usage is not limited to such applications. Each application should be considered individually. This class of fluoroelastomers is not recommended for use in high tempe
8、rature stabilized, “HTS”, engine oils. Each “HTS” oil should be evaluated separately. This fluorocarbon rubber has a typical service temperature range of -20 to +400 F (-29 to +204 C) in air. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and processes described or refe
9、renced 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 safe and proper use of any hazardous materials and to take necessary pr
10、ecautionary measures to ensure the 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 o
11、f 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 AMS7259E Page 2 of 11 2.1 SAE Publications Available from SAE International, 400 Comm
12、onwealth 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 Packings AMS3023 Fluid, Reference for Testing Polyol Ester (and Diester) Resistant Material AIR851 O-Ring Tension Testing C
13、alculations AS3581 Packing, Preformed - O-ring Seal, AMS 7259 AS568 Aerospace Size Standard for O-rings AS5752 Visual Inspection Standard for Elastomeric Sealing Elements Other than O-rings AS871 Manufacturing and Inspection Standards for Preformed Packings (O-Rings) 2.2 ASTM Publications Available
14、from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM D297 Rubber Products - Chemical Analysis ASTM D395 Rubber Property - Compression Set ASTM D471 Rubber Property - Effect of Liquids ASTM D573 Rubber - Deterioration i
15、n an Air Oven ASTM D1329 Rubber Property - Retraction at Lower Temperatures (TR Test) ASTM D1414 Rubber O-Rings ASTM D2240 Rubber Property - Durometer Hardness 2.3 ISO Publications Available from International Organization for Standardization (ISO), 1, ch. De la Voie-Creuse, CP 56, CH-1211 Geneva 20
16、, Switzerland or www.iso.org ISO 3601-1 Fluid Power Systems- O-rings Part 1: Inside diameter, cross sections, tolerances and size identification code ISO 3601-3 Fluid Power Systems O-rings Part 3: Quality Acceptance Criteria 2.4 PRI Publications Available from Performance Review Institute (PRI), 161
17、 Thorn Hill Road, Warrrendale, PA 15086-7257, Tel: 724-772-1616, www.pri-network.org. PD2000 Procedures for an Industry Qualified Product Management Process 3. TECHNICAL REQUIREMENTS 3.1 Material Shall be a compound, based on a fluorocarbon (FKM) elastomer, suitably cured to produce sealing rings, c
18、ompression seals, and molded-in-place gaskets meeting the requirements of 3.2 and 3.3. A dihydroxy/bisphenol SAE AMS7259E Page 3 of 11 cure system shall be used. Material shall be based on 100% virgin fluorocarbon (FKM) elastomer. No reprocessed or non-fluorocarbon polymer is acceptable. 3.1.1 Color
19、 Shall be black or brown. No other color shall be acceptable. 3.2 Properties Rings shall conform to the requirements shown in Table 1; tests shall be performed on the rings supplied and in accordance with ASTM D1414, insofar as practicable. O-ring sizes that are suitable for test are shown in Table
20、3. For all other sizes, and products, tests shall be conducted on a size -214 O-ring of identical batch and state of cure as the end item. Compression set and specific gravity tests shall be conducted on the end item if possible. Calculations of tensile strength and elongation may be made in accorda
21、nce with AIR851. TABLE 1 - PROPERTIES Property Requirement Test Method 3.2.1 Hardness, Durometer “A” or equivalent 90 5 ASTM D2240 3.2.2 Tensile Strength, min 1400 psi (9.65 MPa) ASTM D1414 3.2.3 Elongation, min 100% ASTM D1414 3.2.4 Specific Gravity Preproduction Value 0.02 ASTM D297 (Hydrostatic M
22、ethod) 3.2.5 Aromatic Fuel Resistance ASTM D471 ASTM Ref. Fuel B 73 F 5 (23 C 2) 70 hours 0.5 3.2.5.1 Hardness Change, Durometer “A” or equivalent -5 to +5 3.2.5.2 Tensile Strength Change, max -20% 3.2.5.3 Elongation Change, max -20% 3.2.5.4 Volume Change 0 to +5% SAE AMS7259E Page 4 of 11 TABLE 1 -
23、 PROPERTIES (CONTINUED) Property Requirement Test Method 3.2.6 Synthetic Lubricant Resistance ASTM D471 (See Note A) AMS3023 392 F 5 (200 C 3) 70 hours 0.5 3.2.6.1 Hardness Change, Durometer “A” or equivalent -15 to 0 3.2.6.2 Tensile Strength Change, max (based on area before immersion) -35% 3.2.6.3
24、 Elongation Change, max -20% 3.2.6.4 Volume Change +1 to +25% 3.2.6.5 Compression Set, Percent of Original Deflection, max Ring Cross Section Diameter 0.066 to 0.110, inch (1.68 to 2.79 mm), incl Over 0.110 inch (2.79 mm) 35 20 ASTM D395 Method B 3.2.7 Dry Heat Resistance ASTM D573 518 F 5 (270 C 3)
25、 70 hours 0.5 3.2.7.1 Hardness Change, Durometer “A” or equivalent -5 to +10 3.2.7.2 Tensile Strength Change, max -45% 3.2.7.3 Elongation Change, max -20% 3.2.7.4 Weight Loss, max 10% 4.5.1 3.2.8 Compression Set, Percent of Original Deflection, max Ring Cross Section Diameter, 0.066 to 0.110, inch (
26、1.68 to 2.79 mm), incl Over 0.110 inch (2.79 mm) 35 25 ASTM D395 Method B 392 F 5 (200 C 3) 22 hours 0.5 SAE AMS7259E Page 5 of 11 TABLE 1 - PROPERTIES (CONTINUED) Property Requirement Test Method 3.2.9 Long-Term Compression Set, Percent of Original Deflection, max Ring Cross Section Diameter, 0.066
27、 to 0.110, inch (1.68 to 2.79 mm), incl Over 0.110 inch (2.79 mm) 65 60 ASTM D395 Method B 392 F 5 (200 C 3) 336 hours 0.5 3.2.10 Low-Temperature Resistance, Temperature Retraction, TR10Point, max +5 F (-15 C) ASTM D1329 (Note A) Do not dip specimen in acetone; blot dry residual oil from specimen. 3
28、.3 Properties After Humidity Aging on Brown Seals Only The properties shown in Table 2 shall be determined on brown seals that have been aged for 28 days 2 hours at 77 F 4 (25 C 2) and 95% 3 relative humidity. TABLE 2 - HUMIDITY AGED PROPERTIES Property Requirement Test Method 3.3.1 Tensile Strength
29、, min 1400 psi (9.65 MPa) ASTM D1414 3.3.2 Elongation, min 100% ASTM D1414 3.3.3 Tensile Strength Change, max(1)-15% ASTM D1414 3.3.4 Elongation Change, max(1)-15% ASTM D1414 3.3.5 Synthetic Lubricant Resistance ASTM D471 (Note A) AMS3023 392 5 (200 C 3) 70 hours 0.5 3.3.5.1 Tensile Strength Change,
30、 max(2)-35% 3.3.5.2 Elongation Change, max(2)-20% 3.3.5.3 Compression Set, Percent of Original Deflection, max 15 SAE AMS7259E Page 6 of 11 TABLE 2 - HUMIDITY AGED PROPERTIES (CONTINUED) Property Requirement Test Method 3.3.6 Dry Heat Resistance After Humidity Age ASTM D573 518 F 5 (270 C 3) 70 hour
31、s 0.5 3.3.6.1 Tensile Strength Change, max -45% 3.3.6.2 Elongation Change, max -25% 3.3.7 Compression Set, Percent of Original Deflection, max 25 ASTM D395 Method B 392 F 5 (200 C 3) 22 hours 0.5 Note A Do not dip specimens in acetone; blot dry residual oil from specimen. (1) Shall be based on the o
32、riginal tensile strength and elongation found when tested to the requirements of Table 1. (2) Shall be based on the tensile strength and elongation after aging 28 days 2 hours at 77 F 5 (25 C 2) and 95% 3 relative humidity. TABLE 3 - SUITABLE TEST SIZES (SEE 3.2) 1/8 inch Spool CS 0.070 011 to 014 1
33、/4 inch Spool CS 0.070 015 to 021 0.103 113 to 119 0.139 211 to 213 1/2 inch Spool CS 0.070 022 to 050 0.103 120 to 163 0.139 214 to 258 SAE AMS7259E Page 7 of 11 3.4 Quality Product, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign material as commer
34、cially 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 requiremen
35、ts. 3.5 Dimensions and Tolerances Dimensions 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 inspec
36、tion. 3.6 3.6 Toxicological Formulations The 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. 3.7 Qualification Products sold to this specification shall be lis
37、ted on the PRI qualified products list, (QPL). The qualified products list shall be in accordance with PD2000 (see 8.2). 3.7.1 Seals that qualify are placed on a Qualified Product List (QPL) maintained by the QPL agency. To qualify, seals shall meet the tests specified in Tables 1 and 2, performed i
38、n accordance with the provisions of 8.2 3.7.2 Qualification shall be in accordance with the provisions of 3.7.4 and 3.7.5. 3.7.3 Recertification of qualification is required every three years. Recertification consists of complete qualification tests in accordance with the requirements listed in Tabl
39、es 1 and 2. 3.7.4 Qualification testing, review of results, approval, reapproval and recertification of qualification for QPL listing shall be in accordance with PD 2000 or equivalent and the instructions from the responsible QPL agency. 3.7.5 Seals furnished to this specification will be listed or
40、approved for listing on the qualified products list (QPL) in accordance with the provisions of 8.2 and 8.3. Changes in the product formulation, basic methods of manufacturer or plant site for qualified seals listed or approved for listing on the “QPL“, are not permitted without first notifying the r
41、esponsible QPL agency to assess the need for requalification and/ or revision to the QPL. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The manufacturer of product shall supply all samples and shall be responsible for the performance of all required tests. Purchaser reserves the
42、right to sample and to perform any confirmatory testing deemed necessary to ensure that product conforms to the specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests for O-rings Requirements shown in Table 4 are acceptance tests and shall be performed on each lot. Acceptance tes
43、ts 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 Table 3. SAE AMS7259E Page 8 of 11 For all other sizes compression set and specific gravity tests shall be conducted on the end item or a section removed from the e
44、nd 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 inspection but are
45、 otherwise expected to meet the physical properties of this specification may be used for specific gravity and compression set testing. TABLE 4 - ACCEPTANCE REQUIREMENTS Requirement Paragraph Hardness 3.2.1 Tensile Strength 3.2.2 Elongation 3.2.3 Specific Gravity 3.2.4 Compression Set 3.2.8 Quality
46、3.4 Sizes and Tolerances 3.5 4.2.2 Acceptance tests for all other seal geometries: Specific gravity and volume swell (Section 3.2.4 and 3.2.6.4) 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 cur
47、e 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 have not passed visual inspection but are otherwise expected to meet the physical properties of this specification may be used
48、 for specific gravity and volume swell testing. 4.2.3 Qualification Tests All technical requirements are qualification tests and shall be performed, and approved by the QPL agency, prior to or on the initial shipment of the product by the manufacturer, when a change in ingredients and/or processing requires reapproval as in 4.4.1 and when purchaser deems confirmatory testing to be required. 4.3 Sampling and Testing Shall be as follows. 4.3.1 Acceptance Tests Sufficient product shall be taken at random from each lot to perfor
