SAE AMS 7379-2008 Rubber Fluorocarbon Elastomer (FKM) 70 to 80 Hardness Low Temperature Sealing Tg -40 (-40 For Elastomeric Seals in Aircraft Engine Oil Fuel and Hydraulics Systems.pdf

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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 therefr

2、om, 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 2008 SAE International All rights reserved. No part of this publication may

3、 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: 724-776-4970 (outside USA) F

4、ax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgAMS7379AEROSPACEMATERIALSPECIFICATIONIssued 2008-07 Rubber: Fluorocarbon Elastomer (FKM) 70 to 80 Hardness, Low Temperature Sealing Tg -40 F (-40 C) For Elastomeric Seals in Aircraft Engine Oil, Fuel and Hydraulics Syst

5、ems RATIONALESpecification covers a grade of fluoroelastomer capable of meeting a glass transition (Tg) value of -40 F (-40 C). 1. SCOPE 1.1 Form This specification covers high temperature, compression set and fluid resistant fluorocarbon elastomer material to be used in the form of O-rings, compres

6、sion seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications.1.2 Application These products have resistance to a variety of gas turbine engine oils, including high thermal stability (HTS) oils, fuels, and hydraulic fluids, but usage is not limited to such applicat

7、ions. Each application should be considered separately. This fluorocarbon (FKM) has a service temperature range of -60 to +400 F (-51 to +204 C) in air. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in this specification may involv

8、e 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 precautionary measures to ensure the hea

9、lth 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 of a document unless a specific documen

10、t 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 AMS7379 - 2 -2.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel:

11、877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2817 Packaging and Identification, Preformed Packings AS568 Aerospace Size Standard for O-Rings AIR851 O-Ring Tension Testing Calculations 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive

12、, 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 - Effects of Liquids ASTM D 573 Rubber - Deterioration in an Air Oven ASTM D 1329 Rubber Property

13、- Retraction at Lower Temperatures (TR Test) ASTM D 1414 Rubber O-Rings ASTM D 1418 Standard Practice for Rubber and Rubber Latices - Nomenclature ASTM D 2240 Rubber Property - Durometer Hardness 2.3 ISO Publications Available from American National Standards Institute, 25 West 43rd Street, New York

14、, NY 10036-8002, Tel: 212-642-4900, www.ansi.org.ISO 3601-3 Fluid Power Systems O-rings Part 3: Quality acceptance criteria 2.4 PRI Publications Available from Performance Research Institute, 161 Thorn Hill Road, Warrendale, PA 15086-7257, Tel: 724-772-1616, www.pri-network.org.PD2000 Procedures for

15、 an Industry Qualified Product Management Process 3. TECHNICAL REQUIREMENTS3.1 MaterialThe product shall be prepared from ingredients as shall be necessary to achieve the requirements detailed in this standard. The composition is not defined by this standard. The basic ingredient shall be based on 1

16、00% virgin fluorocarbon (FKM) elastomer meeting ASTM D 1418 Type 3. No reprocessed or non-fluorocarbon polymer is acceptable. 3.2 PropertiesThe product shall conform to the requirements shown in Table 1. Whenever possible, tests shall be performed on the product supplied and in accordance with ASTM

17、D 1414. O-ring sizes that are suitable for testing are shown in Table 3. For all other sizes tests shall be conducted on AS568 size -214 O-rings of identical batch and state of cure as the end item. Calculations of tensile strength and elongation may be made in accordance with AIR851. SAE AMS7379 -

18、3 -TABLE 1 - PROPERTIES Property Requirements Test Method 3.2.1 Hardness, Durometer “A” or Equivalent 75 5 ASTM D 2240 3.2.2 Tensile Strength, min 1300 psi (8.96 Mpa) ASTM D 1414 3.2.3 Elongation, min 120% ASTM D 1414 3.2.4 Specific Gravity Qualification Value 0.02 ASTM D 297, hydrostatic method 3.2

19、.5 Low-Temperature Resistance Temperature Retraction, (TR10), F (C ) max -37 (-38.3) ASTM D 1329 (use test slab as specimen)3.2.6 Low-Temperature Resistance Glass Transition (Tg) Mid-Point, max F (C ) -40 (-40) ASTM D 3418 3.2.7 Aromatic Fuel Resistance ASTM D 471 ASTM Reference Fuel B 73 F 5 (23 C

20、2)70 hours 0.53.2.7.1 Hardness Change, Durometer “A” or Equivalent -10 3.2.7.2 Tensile Strength Change, max -35% 3.2.7.3 Elongation Change, max -20% 3.2.7.4 Volume Change, max 1 to +10% 3.2.8 Turbine Engine Oil Resistance ASTM D 471 (Note 1) SAE 3085 (Reference Oil 300) 392 F 5 (200 C 2)70 hours 0.5

21、3.2.8.1 Hardness Change, Durometer “A” or Equivalent -10 3.2.8.2 Tensile Strength Change, max -30% 3.2.8.3 Elongation Change, max -20% 3.2.8.4 Volume Change, max 0 to +10% 3.2.8.5 Compression Set, max 25% ASTM D 395 Method B SAE 3085 (Reference Oil 300) 392 F 5 (200 C 2)70 hours 0.53.2.8.6 Long Term

22、 Compression Set, max 55% ASTM D 395 Method B SAE 3085 (Reference Oil 300) 392 F 5 (200 C 2)336 hours 0.53.2.9 Hydraulic Fluid Resistance ASTM D 471 (Note 1) MIL-PFR-83282275 F 5 (135 C 2)70 hours 0.53.2.9.1 Hardness Change, Durometer “A” or Equivalent -7 3.2.9.2 Tensile Strength Change, max -25% 3.

23、2.9.3 Elongation Change, max -15% 3.2.9.4 Volume Change, max +6% 3.2.9.5 Compression Set, max 20% ASTM D 395 Method B MIL-PFR-83282275 F 5 (135 C 2)70 hours 0.53.2.9.6 Long Term Compression Set, max 35% ASTM D 395 Method B MIL-PFR-83282275 F 5 (135 C 2)336 hours 0.5SAE AMS7379 - 4 -TABLE 1 - PROPERT

24、IES (CONTINUED) Property Requirements Test Method 3.2.10 Dry Heat Resistance ASTM D 573 518 F 5 (270 C 2)70 hours 0.53.2.10.1 Hardness Change, Durometer “A” or Equivalent -10 to +5 3.2.10.2 Tensile Strength Change, max -45% 3.2.10.3 Elongation Change, max -10% 3.2.10.4 Weight Loss, max 10% 4.6.1 3.2

25、.10.5 Compression Set, % of Original Deflection, max 20% ASTM D 395 Method B 392 F 5 (200 C 2)22 hours 0.53.2.10.6 Long Term Compression Set, max 55% ASTM D 395, Method B 392 F 5 (200 C 2)336 hours 0.5Note 1: Do not dip specimens in acetone; blot dry residual oil from specimen. 3.3 QualitySeals, as

26、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 the seals. Surface imperfections shall be no greater than permitted by ISO 3601-3 grade CS for minor defec

27、ts.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 shall be specified in AS568. 3.5 Toxicological Formulations The material shall have no adverse effects on the

28、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 the Performance Review Institute (PRI) Qualified Products List (QPL). The qualified p

29、roducts list shall be in accordance with PD2000 (See 8.2). 3.6.1 Qualification shall be reapproved every three years in accordance with PD2000 and the instructions from the PRI. Testing shall be in accordance with 4.2.2.2. 4. QUALITY ASSURANCE 4.1 Responsibility for InspectionThe manufacturer of the

30、 product shall be responsible for performance of all required tests. Purchaser reserves the right to sample 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).SAE AMS7

31、379 - 5 -4.2 Classification of Tests 4.2.1 Acceptance Tests Each lot of product shall conform to Table 2. TABLE 2 - INITIAL ACCEPTANCE TESTS Requirement Paragraph Hardness 3.2.1 Tensile Strength 3.2.2 Elongation 3.2.3 Specific Gravity 3.2.4 Compression Set 3.2.10.5 Quality 3.3 Sizes and Tolerances 3

32、.4 4.2.1.1 Lot A quantity of one size of product processed and packaged as one production entity from a batch. 4.2.1.2 Batch A quantity of compound run through a mill or mixer at one time. 4.2.1.3 Random Sampling The method shall be specified in the parts standard, drawing or purchase document. If n

33、ot 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. 4.2.1.4 Sample Shall be end product whenever possible. Suitable test size for O-rings sha

34、ll be determined by Table 3. 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. TABLE 3 - SUITABLE TEST SIZES Spool Size Cross-section O-ring Size 1/8 inch 0.070 -011 to -014 1/4 inch 0.070 -015 to -021 0.103 -113 to -

35、213 0.139 -211 to -213 1/2 inch 0.070 -022 to -050 0.103 -120 to -163 0.139 -214 to -258 4.2.1.5 Report The supplier of the product shall prepare an acceptance test report. This report shall include: AMS number, manufacturers identification and product designation, batch/lot number, date of manufact

36、ure, and the results of all acceptance tests. SAE AMS7379 - 6 -4.2.2 Qualification Tests All technical requirements shall be performed prior to the initial shipment of the product to a purchaser, when a change in ingredients and/or processing requires reapproval, when purchaser deems confirmatory te

37、sting to be required, and for reapproval of qualification per 3.6.1. 4.2.2.1 Sample Shall be from a production batch/lot; AS568 size -214 O-rings shall be used for all testing. 4.2.2.2 Testing Shall be in accordance with PD2000. Verification tests shall consist of tests listed in Table 2 plus long t

38、erm compression set (3.2.8.6 and 3.2.9.6). Testing for qualification reapproval shall be all technical requirements (no verification tests are required).4.2.2.3 Report The supplier of the product shall make a qualification test report available. This report shall include AMS number, manufacturers id

39、entification and product designation, batch/lot number, date of manufacture, and the results of all qualification tests.4.3 Inspection 4.3.1 End of Manufacturing Process Inspection Each individual seal shall be inspected according to ISO 3601-3 Class CS under 1X magnification. The entire seal surfac

40、e shall be manually or electronically inspected. 4.3.2 Final Inspection The sample size shall be as indicated in Table 4. Inspection shall be according to ISO 3601-3 Class CS under 2X magnification. The entire seal surface shall be manually or electronically inspected.TABLE 4 - FINAL INSPECTION SAMP

41、LE SIZE 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 3201 to 10 000 38 10 001 to 35 000 46 35 001 to 150 000 56 150 001 and over 65 SAE AMS7379 - 7 -4.4 Test Methods 4.4.1 Weight Loss Tests The weight loss test shall be cond

42、ucted on samples air-aged at 518 F 5 (270 C 2). Test specimens shall be conditioned for 24 hours 0.5 in a desiccator before and after air aging. The specimens shall be weighed immediately after the desiccation period before and after aging. The percentage weight loss shall be calculated as shown in

43、Equation 1.100*WWWLossWeightPercentage121= (Eq. 1) where:W1= Weight of sample before air-aging W2= Weight of sample after air-aging 4.5 Approval 4.5.1 Manufacturer shall use ingredients, manufacturing procedures, processes, and methods of inspection on production product which are essentially the sa

44、me as those used on the qualification sample. If any change in ingredients, in type of equipment for processing, or in manufacturing procedures is necessary, manufacturer shall submit for reapproval a statement of the proposed changes in ingredients and/or processing and, when requested, sample prod

45、uct. Production product made by the revised procedure shall not be shipped prior to receipt of re-approval. 4.5.2 Manufacturer shall establish, for each size of seal, parameters for the process control factors which will produce seals meeting the technical requirements of this specification. These s

46、hall constitute the approved procedures and shall be used for manufacturing production of seals. If necessary to make any change in parameters for the process control factors, manufacturer shall submit for re-approval a statement of the proposed changes in ingredients and/or processing. When request

47、ed, sample seals shall be submitted in accordance with the provisions of 4.1. Seals manufactured using a revised procedure shall not be shipped prior to re-approval of qualification in writing. 4.5.2.1 Control factors for producing seals include, but are not limited to, the following: Compound ingre

48、dients and proportions thereof within established limits Sequence of mixing compound ingredients Type of mixing equipment Method and equipment for preparing performs Basic molding procedure (compression, transfer, injection) Cure time, cure temperature, and cure pressure; variations of 10% are permi

49、ssible Postcure time and postcure temperature; variations of 10% are permissible Finishing methods Methods of inspection SAE AMS7379 - 8 -4.6 Reports The supplier of the product shall make readily available a report showing the results of tests to determine conformance to the acceptance requirements and stating that the product conforms to the other technical requirements. This report shall include AMS number with revision, manufacturers identification and product de