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 2011 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/AMS7276H AEROSPACE MATERIAL SPECIFICATION AMS7276 REV. H Issued 1974-06 Revised 2011-06 Super
5、seding AMS7276G Rubber: Fluorocarbon (FKM) High-Temperature-Fluid Resistant Low Compression Set For Seals In Fuel Systems and Specific Engine Oil Systems RATIONALE AMS7276H results from a Five Year Review and update of this specification. HTS oils have been defined. Acceptance tests have been define
6、d for seal sizes other than those listed in Table 3. 1. SCOPE 1.1 Form This specification covers a fluorocarbon (FKM) rubber in the form of O-rings, compression seals, O-ring cord, and molded-in-place gaskets. 1.2 Application These products have been used typically as sealing rings, compression seal
7、s, O-ring cord, and molded-in-place gaskets in contact with air and a wide variety of fuels, lubricants, and specific hydraulic fluids from -20 to +400 F (-29 to +204 C), but usage is not limited to such applications. Each application should be considered individually. This class of fluoroelastomers
8、 may not be suitable for use in some high temperature stabilized, “HTS”, engine oils. Each “HTS” oil should be evaluated separately. Examples of “HTS“ oils are those oils conforming to MIL-PRF-23699 Class HTS, MIL-PRF-7808 Grade 4, and AS5780 Class HPC. 1.3 Safety - Hazardous Materials While the mat
9、erials, 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 safe and
10、proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved. SAE AMS7276H Page 2 of 11 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specif
11、ication 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 been cancelled and no superseding document has been specified, the last published issue of that document shall apply. 2
12、.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS2817 Packaging and Identification, Preformed Packings AMS3023 Fluid, Reference for Testing Polyol Ester (a
13、nd Diester) Resistant Material AS568 Aerospace Size Standard for O-rings AIR851 O-Ring Tension Testing Calculations AS871 Manufacturing and Inspection Standards for Preformed Packings (O-Rings) AS3208 Packing, Preformed - AMS 7276 - Seal AS3209 Packing, Preformed - AMS 7276, “O“ Ring AS5752 Aerospac
14、e - Visual Inspection Standard for Elastomeric Sealing Elements Other than O-Rings PD2000 Procedures for an Industry Qualified Product Management Process 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
15、, www.astm.org. ASTM D 297 Rubber Products - Chemical Analysis ASTM D 395 Rubber Property - Compression Set ASTM D 471 Rubber Property - Effect of Liquids ASTM D 573 Rubber - Deterioration in an Air Oven ASTM D 1329 Evaluating Rubber Property - Retraction at Lower Temperatures (TR Test) ASTM D 1414
16、Rubber O-Rings ASTM D 2240 Rubber Property - Durometer Hardness SAE AMS7276H Page 3 of 11 2.3 ISO Publications Available from International Organization for Standardization (ISO), Case Postale 56, CH-1211 Geneva, Switzerland or www.iso.org ISO 3601-1 Fluid Power Systems O-Rings Part 1: Inside Diamet
17、ers, Cross-sections, Tolerances and Designation Codes ISO 3601-3 Fluid Power Systems O-Rings Part 3: Quality Acceptance Criteria 3. TECHNICAL REQUIREMENTS 3.1 Material Shall be a compound, based on a fluorocarbon (FKM) elastomer, suitably cured to produce sealing rings, compression seals and moded-i
18、n-place gaskets meeting the requirements of 3.2 and 3.3. A dihydroxy/bisphenol 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 Shall be black or brown. No other color shall be accept
19、able. 3.2 Properties Rings shall conform to the requirements shown in Table 1. Brown colored rings shall also conform to the requirements shown in Table 2. Tests shall be performed in accordance with ASTM D 1414 unless otherwise indicated. Calculations of tensile strength and elongation may be made
20、in accordance with AIR851. SAE AMS7276H Page 4 of 11 TABLE 1 - PROPERTIES Paragraph Property Requirement Test Method 3.2.1 Hardness, Durometer “A” or equivalent 75 5 ASTM D 2240 3.2.2 Tensile Strength, min 1400 psi (9.65 MPa) 3.2.3 Elongation, min 125% 3.2.4 Density Preproduction Value 0.02 3.2.5 Ar
21、omatic Fuel Resistance ASTM D 471 Medium: ASTM Ref. Fuel B Temperature: 73 F 5 (23 C 2) Time: 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% 3.2.6 Synthetic Lubric
22、ant Resistance ASTM D 471 (Note A)Medium: AMS3023 Temperature: 392 F 5 (200 C 3) Time: 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 Elongation Change, max -20% 3.2.6.4 Volume Change +1 to
23、 +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) 30 10 ASTM D 395 Method B 3.2.7 Dry Heat Resistance ASTM D 573 Temperature: 518 F 5 (270 C 3) Time: 70 hours 0.5 3.2.7.1 Hardness Chan
24、ge, Durometer “A” or equivalent -5 to +10 3.2.7.2 Tensile Strength Change, max -35% 3.2.7.3 Elongation Change, max -15% 3.2.7.4 Weight Loss, max 10% 4.6.1 SAE AMS7276H Page 5 of 11 TABLE 1 - PROPERTIES (CONTINUED) Paragraph Property Requirement Test Method 3.2.8 Compression Set, Percent of Original
25、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) 20 15 ASTM D 395 Method B Temperature: 392 F 5 (200 C 3) Time: 22 hours 0.5 3.2.9 Long-Term Compression Set, Percent of Original Deflection, max Ring Cross Section Diameter, 0.066 to 0
26、.110, inch (1.68 to 2.79 mm), incl Over 0.110 inch (2.79 mm) 45 40 ASTM D 395 Method B Temperature: 392 F 5 (200 C 3) Time: 336 hours 0.5 3.2.10 Low-Temperature Resistance, Temperature Retraction, TR10, Point, max +5 F (-15 C) ASTM D 1329 (Note A) Do not dip specimen in acetone; blot dry residual oi
27、l from specimen. 3.3 Properties After Humidity Aging of 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.
28、1 Tensile Strength, min 1400 psi (9.65 MPa) 3.3.2 Elongation, min 125% 3.3.3 Tensile Strength Change, max (1)-15% 3.3.4 Elongation Change, max (1)-15% 3.3.5 Synthetic Lubricant Resistance ASTM D 471 (Note A) Medium: AMS3023 Temperature: 392 F 5 (200 C 3) Time: 70 hours 0.5 3.3.5.1 Tensile Strength C
29、hange, max (2)-35% 3.3.5.2 Elongation Change, max (2)-20% 3.3.5.3 Compression Set, Percent of Original Deflection, max 10% ASTM D 395 Method B 3.3.6 Dry Heat Resistance ASTM D 573 Temperature: 518 F 5 (270 C 3) Time: 70 hours 0.5 3.3.6.1 Tensile Strength Change, max -35% 3.3.6.2 Elongation Change, m
30、ax -25% SAE AMS7276H Page 6 of 11 TABLE 2 - HUMIDITY AGED PROPERTIES (CONTINUED) Property Requirement Test Method 3.3.7 Compression Set, Percent of Original Deflection, max 15% ASTM D 395 Method B Temperature: 392 F 5 (200 C 3) Time: 22 hours 0.5 (Note A) Do not dip specimen in acetone; blot dry res
31、idual oil from specimen. (1) Shall be based on the original tensile strength and elongation found when tested to the requirements of Table 1. (2) Shall be based on the tensile strength and elongation found after aging 28 days 2 hours at 77 F 5 (25 C 2) and 95% 3 relative humidity. TABLE 3 - SUITABLE
32、 TEST SIZE (SEE 3.2) 1/8 inch Spool CS 0.070 -011 to -014 1/4 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 3.4 Product, as received by purchaser, shall be uniform in quality and condition, smooth, as
33、 free from foreign materials as commercially practicable, and free from internal imperfections detrimental to the 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
34、-rings shall meet AS5752 Type 1 requirements. 3.5 Sizes and Tolerances Shall be as specified on the drawing. Inspection for conformance to dimensional requirements shall be made in accordance with ISO3601-1. 4. QUALITY ASSURANCE PROVISIONS 4.1 Qualification 4.1.1 Seals that qualify are placed on a Q
35、ualified Product List (QPL) maintained by the QPL agency. To qualify, seals shall meet the tests specified in Tables 1 and 2, performed in accordance with the provisions of 8.2. 4.1.2 Qualification shall be in accordance with the provisions of 4.1.4 and 4.1.5. 4.1.3 Recertification of qualification
36、is required every three years. Recertification consists of complete qualification tests in accordance with the requirements listed in Table 1. Brown colored rings shall also conform to the requirements shown in Table 2. 4.1.4 Qualification testing, review of test results, approval, reapproval, and r
37、ecertification of qualification for QPL listing shall be in accordance with PD2000 or equivalent and the instructions from the responsible QPL agency. SAE AMS7276H Page 7 of 11 4.1.5 Seals furnished to this specification will be listed or approved for listing on the qualified products list (QPL) in
38、accordance with the provisions of 8.2 and 8.3. Changes in the product formulation, basic methods of manufacturer, or plant site, for qualified fluorocarbon rubber seals listed or approved for listing on the “QPL”, are not permitted without first notifying the responsible QPL agency to assess the nee
39、d for requalification and/or revision to the QPL. 4.2 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 right to sample and to perform any confirmatory testing deemed necessary
40、 to ensure that product conforms to specified requirements. 4.3 Classification of Tests 4.3.1 Acceptance Tests for O-rings Requirements shown in Table 4 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 14
41、14. O-ring sizes that are suitable for test are shown in Table 3. For all other sizes compression set (3.2.8) and specific gravity (3.2.4) 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 shal
42、l 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 otherwise expected to meet the physical properties of this specification may be used for
43、 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 3.4 Sizes and Tolerances 3.5 4.3.2 Acceptance Tests for All Other Seal Geometries For all
44、 other seal geometries synthetic lubricant volume change (3.2.6.4) and specific gravity (3.2.4) 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
45、 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 for specific gravity testing. 4.3.3 Qualificatio
46、n 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 4.5.1. SAE AMS7276H Page 8 of 11 4.4 Sam
47、pling and Testing Shall be as follows. 4.4.1 Acceptance Tests Sufficient product shall be taken at random from each lot to perform all the required tests in Table 4. The number of determinations for each requirement shall be as specified, in the applicable test procedure or, if not specified therein
48、, not less than three, except as otherwise specified in 4.4.1.3. 4.4.1.1 A lot shall be all rings of the same size, from the same batch of compound processed in one continuous run and presented for manufacturers inspection at one time. 4.4.1.2 A batch shall be the quantity of compound run through a
49、mill or mixer at one time. Mixing of batches of previously compounded material is not permitted. 4.4.1.3 A statistical sampling plan acceptable to the purchaser may be used in lieu of sampling as in 4.4.1. Sample size for visual and dimensional requirements shall be as shown in Table 5; sample unit shall be one molded part and
