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/AMS7273D AEROSPACE MATERIAL SPECIFICATION AMS7273 REV. D Issued 1968-11 Reaffirmed 2001-04 Re
5、vised 2011-06 Superseding AMS7273C Rubber: Fluorosilicone (FVMQ) High Temperature Fuel and Oil Resistant For Seals In Fuel Systems and Specific Engine Oil Systems RATIONALE AMS7273D results from a Five Year Review and update of this specification. A qualified products list requirement has been added
6、 to this specification. Acceptance tests have been defined for seal sizes other than those listed in ARP3050. 1. SCOPE 1.1 Form This specification covers a fluorosilicone (FVMQ) rubber in the form of molded rings. 1.2 Application This product has been typically used from -67 to +347 F (-55 to +175 C
7、) in fuels and from -67 to +302 F (-55 to +150 C) in lubricating oils. This product is not recommended for use in most synthetic turbine lubricants, particularly high temperature stabilized, “HTS”, engine oils (those conforming to MIL-PRF-23699 Class HTS, MIL-PRF-7808 Grade 4 and AS5780 Class HPC).
8、The cross-section of such rings is usually not over 0.275 inch (6.98 mm) in diameter or thickness, but usage is not limited to such applications. 1.3 Safety - Hazardous Materials While the materials, methods, applications and processes described or referenced in this specification may involve the us
9、e 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 health and s
10、afety 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 document issue i
11、s 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 AMS7273D Page 2 of 14 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel:
12、 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS2817 Packaging and Identification, Preformed Packings AMS3021 Fluid, Reference, for Testing Di-Ester (Polyol) Resistant Material AMS5645 Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, Tubing, and Rings,
13、18Cr - 10Ni - 0.40Ti (321), Solution Heat Treated AMS5646 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, Tubing, and Rings, 18Cr - 11Ni - 0.60Cb (SAE 30347), Solution Heat Treated AS568 Aerospace Size Standard for O-rings AIR851 O-Ring Tension Testing Calculations AS871 Manufacturing and
14、 Inspection Standards for Preformed Packings (O-Rings) ARP3050 Suitable Test Sizes for O-ring Specifications AS5194 Fitting, Adapter, Straight Pipe to Flared AS9966 Packing, Preformed - AMS 7273, Seal AS9967 Packing, Preformed - AMS 7273, “O” Ring PD2000 Procedures for an Industry Qualified Product
15、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, www.astm.org. ASTM D 395 Rubber Property - Compression Set ASTM D 471 Rubber Property - Effect of Liquids ASTM D 573 Rubber - Deterio
16、ration in an Air Oven ASTM D 1329 Evaluating Rubber Property - Retraction at Lower Temperatures (TR Test) ASTM D 1414 Rubber O-Rings ASTM D 2240 Rubber Property - Durometer Hardness SAE AMS7273D Page 3 of 14 2.3 ISO Publications Available from International Organization for Standardization, 1, rue d
17、e Varembe, Case postale 56, CH-1211 Geneva 20, Switzerland, Tel: +41-22-749-01-11, www.iso.org. ISO 3601-1 Fluid Power Systems - O-Rings - Part 1: Inside Diameters, Cross-sections, Tolerances and Designation Codes ISO 3601-3 Fluid Power Systems - O-Rings - Part 3: Quality Acceptance Criteria 3. TECH
18、NICAL REQUIREMENTS 3.1 Material Shall be a compound, based on a fluorosilicone (FVMQ) elastomer, suitably cured to produce sealing rings meeting the requirements of 3.2. 3.1.1 Color Shall be blue. 3.2 Properties Rings shall conform to the following requirements. Tests shall be performed in accordanc
19、e with ASTM D 1414 unless otherwise indicated. Calculations of tensile strength may be made in accordance with AIR851. SAE AMS7273D Page 4 of 14 TABLE 1 - PROPERTIES Paragraph Property Value 3.2.1 As Received 3.2.1.1 Hardness, Durometer “A” or equivalent 75 5 ASTM D 2240 3.2.1.2 Tensile Strength, mi
20、nimum 800 psi (5.52 MPa) 3.2.1.3 Elongation, minimum 100% 3.2.1.4 Tensile Stress at 100% Elongation 700 to 1000 psi (4.83 to 6.90 MPa) 3.2.1.5 Corrosion Nil 3.2.1.6 Specific Gravity Preproduction Value 0.03 3.2.2 Aromatic Fuel Resistance (Immediate Deteriorated Properties) ASTM D 471 Medium: ASTM Re
21、f. Fuel BTemperature: 68 to 86 F (20 to 30 C) Time: 70 hours 0.5 3.2.2.1 Hardness Change, Durometer “A” or equivalent -10 to 0 3.2.2.2 Tensile Strength Change, maximum -30% 3.2.2.3 Elongation Change, maximum -15% 3.2.2.4 Volume Change 0 to +20% 3.2.3 Synthetic Lubricant Resistance 3.2.3.1 Hardness C
22、hange, Durometer “A” or equivalent -10 to 0 ASTM D 471 Medium: AMS3021 Temperature: 302 F 5 (150 C 3) Time: 70 hours 0.5 3.2.3.2 Tensile Strength Change, maximum -25% 3.2.3.3 Elongation Change, maximum -20% 3.2.3.4 Volume Change 0 to +12% 3.2.4 Dry Heat Resistance ASTM D 573 Temperature: 392 F 5 (20
23、0 C 3) Time: 70 hours 0.5 3.2.4.1 Hardness Change, Durometer “A” or equivalent -5 to +5 3.2.4.2 Tensile Strength Change, maximum -10% 3.2.4.3 Elongation Change, maximum -15% 3.2.4.4 Bend (Flat) No cracking or checking SAE AMS7273D Page 5 of 14 TABLE 1 - PROPERTIES (CONTINIUED) Paragraph Property Val
24、ue 3.2.5 Compression Set Percent of Original Deflection Ring Cross Section Diameter 0.066 to 0.110 inch, incl (1.68 to 2.79 mm, incl) Over 0.110 inch (2.79 mm) 50% 30% ASTM D 395 Method B Temperature: 347 F 5 (175 C 3) Time: 22 hours 0.25 3.2.6 Low-Temperature Resistance Temperature Retraction, TR10
25、point, maximum -67 F (-55 C) ASTM D 1329 3.2.7 Simulated Component Test Pass 4.5.1 3.3 Quality Product, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign material as commercially practicable, and free from internal imperfections detrimental to usage of
26、 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 requirements. 3.4 Sizes and Tolerances Shall be as specified on the drawing. The recommend
27、ed part standards for sealing rings meeting this specification are AS9966 and AS9967. Inspection for conformance to dimensional requirements shall be in accordance with ISO3601-1. 4. QUALITY ASSURANCE PROVISIONS 4.1 Qualification 4.1.1 Seals that qualify are placed on a Qualified Product List (QPL)
28、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 is required every three year
29、s. Recertification consists of complete qualification tests in accordance with the requirements listed in Tables 1 and 2. 4.1.4 Qualification testing, review of test results, approval, reapproval, and recertification of qualification for QPL listing shall be in accordance with PD 2000 or equivalent
30、and the instructions from the responsible QPL agency. 4.1.5 Seals furnished to this specification will be listed or 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
31、site, for qualified rubber seals listed or approved for listing on the “QPL”, are not permitted without first notifying the responsible QPL agency to assess the need for requalification and/or revision to the QPL. SAE AMS7273D Page 6 of 14 4.2 Responsibility for Inspection The manufacturer of produc
32、t shall supply all samples for vendors tests 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 product conforms to specified requirements. 4.3 Classification of Tests 4.3.
33、1 Acceptance Tests for O-rings Requirements shown in Table 2 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 1414. O-ring sizes that are suitable for test are those listed in ARP3050 for FVMQ materials.
34、For all other sizes compression set (3.2.5) and specific gravity (3.2.1.6) tests shall be conducted on the end item or a section removed from the end item. Testing performed on an MS9967-214 O-ring of the same batch and state of cure shall satisfy the remaining acceptance tests as long as the testin
35、g 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 specific gravity and compression set testing. TABLE 2 - ACCEP
36、TANCE TESTS Requirement Paragraph Hardness, as received 3.2.1.1 Tensile Strength, as received 3.2.1.2 Elongation, as received 3.2.1.3 Tensile Stress, as received 3.2.1.4 Specific Gravity, as received 3.2.1.6 Volume Change in fuel 3.2.2.4 Compression Set 3.2.5 4.3.2 Acceptance Tests for All Other Sea
37、l Geometries For all other seal geometries volume change in fuel (3.2.2.4) and specific gravity (3.2.1.6) tests shall be conducted on the end item or a section removed from the end item. Testing performed on an MS9967-214 O-ring of the same batch and state of cure shall satisfy the remaining accepta
38、nce 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 for volume change and specific gravi
39、ty testing. 4.3.3 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 4.4.2, and
40、 when purchaser deems confirmatory testing to be required. 4.4 Sampling and Testing Shall be as follows. 4.4.1 For Acceptance Tests Sufficient rings shall be selected at random from each lot to perform all required tests. The number of determinations for each requirement shall be as specified in the
41、 applicable test procedure or, if not specified therein, not less than three. SAE AMS7273D Page 7 of 14 4.4.1.1 A lot shall be all rings of the same nominal size produced from the same batch of compound processed in one continuous series of operations and presented for vendors inspection at one time
42、 plus rings as required for the simulated component test when the size used for that test is not part of the lot. A lot shall not exceed 1000 rings or 300 pounds (136 kg), whichever is the greater mass, and may be packaged in smaller quantities and delivered under the basic lot approval provided lot
43、 identification is maintained. 4.4.1.2 A batch shall be the quantity of compound run through a mill or mixer at one time. 4.4.1.3 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 4.4.1 and the repo
44、rt of 4.6 shall state that such plan was used. 4.4.2 For Qualification Tests As agreed upon by purchaser and vendor. 4.5 Approval 4.5.1 Manufacturer shall establish, for each size of ring, parameters for the process control factors which will produce rings meeting the technical requirements of this
45、specification. These shall constitute the approved procedure and shall be used for manufacturing production rings. If necessary to make any change in parameters for the process control factors, manufacturer shall submit for reapproval a statement of the proposed changes in ingredients and/or process
46、ing and, when requested, sample rings. Production rings incorporating the revised procedures shall not be shipped prior to receipt of reapproval. 4.5.1.1 Control factors for producing rings include, but are not limited to, the following: Compound ingredients or proportions thereof within established
47、 limits Sequence of mixing compound ingredients Type of mixing equipment Method and equipment for preparing preforms Basic molding procedure (compression, transfer, injection) Curing time and pressure; variation of 10% is permissible Basic and minimum curing temperatures Finishing methods Methods of
48、 inspection 4.5.1.1.1 Any of the above process control factors for which parameters are considered proprietary by the vendor may be assigned a code designation. Each variation in such parameters shall be assigned a modified code designation. 4.6 Test Methods Testing fuel at high temperature and high
49、 pressure can be dangerous. Proper safety procedures and precautions shall be used. 4.6.1 Simulated Component Test Sample rings shall pass the following test; any loss of test fluid in excess of “weeping” at any time or pressure on any fixture will be considered failure. Weeping is defined as the formation of small bubbles at a rate not greater than 10 per minute and which do not break th
