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 2012 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/AMS7287 AEROSPACE MATERIAL SPECIFICATION AMS7287 Issued 2012-08 Fluorocarbon Elastomer (FKM)
5、High Temperature / HTS Oil Resistant / Fuel Resistant Low Compression Set / 70 to 80 Hardness, Low Temperature Tg -22 F (-30 C) For Seals in Oil / Fuel / Specific Hydraulic Systems RATIONALE AMS-R-83485 is being superseded by two specifications: AMS7287 replaces AMS-R-83485 (Type I parts) for compre
6、ssion seals and an AMS3000-series specification will replace AMS-R-83485 (Type II parts) for moulded shapes. A new part standard has been produced (AS83485) that will supersede AMS-R-83485/1, although the M83485-XXX numbering system will be retained. The technical requirements of AMS-R-83485 have be
7、en maintained in this document, with the addition of a long-term compression set requirement, replacement of STD / SPC class gas turbine lubricants with AMS3085 (i.e. BP Reference Oil 300, representative of HTS class gas turbine lubricants), and the addition of a glass transition (Tg) value/requirem
8、ent. 1. SCOPE 1.1 Form This specification covers a high temperature, compression set and fluid resistant fluorocarbon (FKM) elastomer in the form, of O-rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications. 1.2 Application These products have
9、been used in contact with air and a wide variety of fuels, lubricants, specific hydraulic fluids, and a variety of gas turbine engine lubricants, including higher thermo-oxidative stability (HTS) lubricants, including those conforming to MIL-PRF-23699 Class HTS, MIL-PRF-7808 Grade 4 and AS5780 Class
10、 HPC, however usage is not limited to such applications. This material type has a typical service temperature range of -40 to +400 F (-40 to +204 C). These products are not suitable for use in phosphate ester based hydraulic fluids. Each application should be considered individually. 1.3 Safety - Ha
11、zardous Materials While the materials, 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
12、 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. SAE AMS7287 Page 2 of 10 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase ord
13、er 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 been cancelled and no superseding document has been specified, the last published issue o
14、f that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS2817 Packaging and Identification, Preformed Packings AMS3085 Fluid, Referen
15、ce for Testing AS5780 HPC Class (Polyol) Resistant Material AS568 Aerospace Size Standard for O-Rings AIR851 O-Ring Tension Testing Calculations ARP3050 Suitable Test Sizes for O-ring Specifications ARP5316 Storage of Elastomer Seals and Seal Assemblies Which Include an Elastomer Element Prior to Ha
16、rdware Assembly AS5752 Aerospace - Visual Inspection Standard for Elastomeric Sealing Elements Other Than O-rings AS5780 Specification for Aero and Aero-Derived Gas Turbine Engine Lubricants 2.2 U.S. Military Specifications Available from The Department of Defense, Single Stock Point for Military Sp
17、ecifications, Standards and Related Publications at http:/dodssp.daps.dla.mil/ MIL-PRF-7808 Performance Specification Lubricating Oil, Aircraft Turbine Engine, Synthetic Base MIL-PRF-23699 Performance Specification Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, Nato Code Number-0156 2.3 A
18、STM 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 297 Rubber Products - Chemical Analysis ASTM D 395 Rubber Property - Compression Set ASTM D 471 Rubber Property - Effect of Liquids ASTM
19、 D 573 Rubber - Deterioration in an Air Oven ASTM D 1329 Rubber Property - Retraction at Lower Temperatures (TR Test) SAE AMS7287 Page 3 of 10 ASTM D 1414 Rubber O-Rings ASTM D 1418 Standard Practice for Rubber and Rubber Latices Nomenclature ASTM D 2240 Rubber Property - Durometer Hardness ASTM D 7
20、426 Assignment of the DSC Procedure for Determining Tg of a Polymer or an Elastomeric Compound 2.4 ISO Publications Available from International Organization for Standardization, 1, rue de Varembe, Case postale 56, CH-1211 Geneva 20, Switzerland, Tel: +41-22-749-01-11, www.iso.org. ISO 3601-1 Fluid
21、Power Systems O-Rings Part 1: Dimensions and Tolerances ISO 3601-3 Fluid Power Systems O-Rings Part 3: Quality Acceptance Criteria 2.5 PRI Publications Available from Performance Review Institute, 161 Thorn Hill Road, Warrendale, PA 15086-7527, Tel: 724-772-1616, www.pri-network.org. PD2000 Procedur
22、es for an Industry Qualified Product Management Process PD2102 Aerospace Quality Assurance, Product Standards, Qualification Procedure, Elastomeric Seal 3. TECHNICAL REQUIREMENTS 3.1 Material Shall be prepared from ingredients as shall be necessary to achieve the requirements detailed in this standa
23、rd and shall be a compound, based on a fluorocarbon elastomer as designated by ASTM D 1418 FKM Type 3, suitably cured to produce product meeting the requirements of 3.2. Material used shall be based on 100% virgin fluorocarbon elastomer. No reprocessed or non-fluorocarbon polymer as designated by AS
24、TM D 1418 FKM Type 3 is acceptable. 3.2 Properties The material shall conform to Table 1. Calculations of tensile strength and elongation may be made in accordance with AIR851. SAE AMS7287 Page 4 of 10 TABLE 1 PROPERTIES Property Requirement Test Method 3.2.1 Specific Gravity Qualification Value 0.0
25、2 ASTM D 297 (Hydrostatic Method) 3.2.2 Hardness, Durometer “A” or equivalent 3.2.3 Tensile Strength, min 75 5 1600 psi (11.03 MPa) ASTM D 2240 ASTM D 1414 3.2.4 Elongation, min 120% ASTM D 1414 3.2.5 Aromatic Fuel Resistance ASTM D 471 ASTM Ref. Fuel B 70 hours 0.5 at 73 F 5 (23 C 3) 3.2.5.1 Hardne
26、ss Change, Durometer “A” or equivalent -5 to +5 3.2.5.2 Tensile Strength Change, max -30% 3.2.5.3 Elongation Change, max -20% 3.2.5.4 Volume Change 1 to 10% 3.2.6 Synthetic Lubricant Resistance ASTM D 471 (Note A) AMS3085 70 hours 0.5 at 392 F 5 (200 C 3) 3.2.6.1 Hardness Change, Durometer “A” or eq
27、uivalent -10 to 0 3.2.6.2 Tensile Strength Change, max -35% SAE AMS7287 Page 5 of 10 TABLE 1 PROPERTIES (CONTINUED) Property Requirement Test Method 3.2.6.3 Elongation Change, max -20% 3.2.6.4 Volume Change +1 to +20% 3.2.6.5 Compression Set, Percent of Original Deflection, max 15 ASTM D 395 Method
28、B 3.2.7 Dry Heat Resistance ASTM D 573 70 hours 0.5 at 527 F 5 (275 C 3) 3.2.7.1 Hardness Change, Durometer “A” or equivalent -5 to +5 3.2.7.2 Tensile Strength Change, max -35% 3.2.7.3 Elongation Change, max -10% 3.2.7.4 Weight Loss, max 12% 4.4.1 3.2.8 Compression Set, Percent of Original Deflectio
29、n, max 20% ASTM D 395, Method B 22 hours 0.5 at 392 F 5 (200 C 3) 3.2.9 Long-Term Compression Set, Percent of Original Deflection, max 50% ASTM D 395, Method B 336 hours 0.5 at 392 F 5 (200 C 3) 3.2.10 Low-Temperature Resistance, Temperature Retraction, 10% (TR10), Point, max -20 F (-29 C) ASTM D 13
30、29 3.2.11 Low Temperature Resistance Glass Transition (Tg), Inflection, max -20 F (-29 C) ASTM D 7426 (Note A) Do not dip specimen in acetone; blot dry residual oil from specimen. SAE AMS7287 Page 6 of 10 3.3 Quality Product, as received by purchaser, shall be uniform in quality and condition, smoot
31、h, as free from foreign material as commercially 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 for O-rings or AS5752 Type 1 for Non O-ring sealing elements
32、. 3.4 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 inspecti
33、on. 3.5 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. 3.6 Qualification Products sold to this specification shall be listed on
34、 the PRI qualified products list (QPL). The qualified products list shall be in accordance with PD2000 (See 8.2). 3.6.1 Qualification shall be reapproved every three years in accordance with PD2000, PD2102 and the instructions from the Performance Review Institute. Testing shall be in accordance wit
35、h 4.2.2. 3.7 Shelf Life The shelf life of this material shall be indefinite as recommended in ARP5316. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The manufacturer of the product shall be responsible for performance of all required tests. Purchaser reserves the right to sample
36、and perform any testing deemed necessary to ensure that the product conforms to the AMS requirements. 4.1.1 Manufacturer Shall be on the current PRI Qualified Manufacturers List (QML). 4.2 Classification of Tests 4.2.1 Acceptance Tests 4.2.2 Acceptance Tests for O-rings Requirements shown in Table 2
37、 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 testing are shown in ARP3050. For all other sizes compression set and specific gravity tests shall be conducted o
38、n 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 long as the testing was performed within 90 days of the manufacture of the subject lot. NOTE: O-rings from the same lot w
39、hich 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 SAE AMS7287 Page 7 of 10 4.2.3 Acceptance Tests for all Other Seal Geometries Specific gravity and volume swell (3.2.1
40、and 3.2.5.4) 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 long as the testing was performed within 90 days of the manufacture of the subject
41、 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 and volume swell testing. 4.2.4 Acceptance Tests Requirements shown in Table 2 are acceptance tests and shall
42、be performed on each lot. TABLE 2 - ACCEPTANCE REQUIREMENTS Requirement Paragraph Specific Gravity 3.2.1 Hardness 3.2.2 Tensile Strength 3.2.3 Elongation 3.2.4 Compression Set 3.2.8 Quality 3.3 Sizes and Tolerances 3.4 4.2.4.1 Lot A quantity of one size of product processed and packaged as one produ
43、ction entity from a batch. 4.2.4.2 Batch A batch shall be the quantity of compound run through a mill or mixer at one time. Excluded from the definition is blending of batches of previously compounded material. 4.2.4.3 Random Sampling The method shall be as specified in the parts standard, drawing o
44、r purchase document. If not specified, product shall be taken at random from each lot to perform all the required acceptance tests. The number of test iterations for each requirement shall be specified in the applicable test procedure. 4.2.4.4 Sample Shall be end product whenever possible. Suitable
45、test size for O-rings shall be determined by ARP3050. When impossible to test the end product, AS568 size -214 O-rings with the same state of cure as the production part shall be tested. 4.2.5 Qualification Tests All technical requirements shall be performed prior to the initial shipment of the prod
46、uct to a purchaser. When a change in ingredients and/or processing requires reapproval, when purchaser deems confirmatory testing to be required, and for reapproval of qualification per 3.6.1. SAE AMS7287 Page 8 of 10 4.2.5.1 Sample Shall be from a production batch/lot; AS568 size -214 O-rings shall
47、 be used for all testing. 4.2.5.2 Testing Shall be in accordance with PD2000 and PD2102. Verification tests shall consist of tests listed in Table 2 plus long term compression set (3.2.9). Testing for qualification reapproval shall be all technical requirements (no verification tests are required).
48、4.2.5.3 Report The supplier of the product shall make a qualification test report available. This report shall include AMS number, manufacturers identification and product designation, batch/lot number, date of manufacture and the results of all qualification tests. 4.3 Inspection 4.3.1 Final Inspec
49、tion Shall be as specified in the parts standard, drawing or purchase document. If not specified, shall be as follows: Prior to inspection, mold flash shall be removed from the parts in such a manner that they conform to the requirements specified herein. Each individual part (100%) shall be visually inspected according to ISO 3601-3, Grade CS or AS5752 (type 1) as applicab
