1、 AEROSPACE MATERIAL SPECIFICATION Fluorocarbon (FKM) Rubber High-Temperature-Fluid Resistant Low Compression Set 85 to 95 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
2、voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, 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 yo
3、ur written comments and suggestions. Copyright 2005 SAE International All rights reserved. No part of this publication 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
4、 permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org AMS 3218CIssued OCT 1997 Revised SEP 2005 Superseding AMS 3218B 1. SCOPE: 1.1 Form: This specification c
5、overs a fluorocarbon (FKM) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes. 1.2 Applications: These products have been used typically in components in contact with air and a wide variety of fuels, synthetic lubricants, and specific hydraulic fluids from -29 to +204 C (-20 t
6、o +400 F), 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 temperature stabilized, “HTS”, engine oils. Each “HTS” oil should be evaluated separately. 1.3 Safety - Hazardous Materials:
7、 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 familiarity with
8、 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. 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
9、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 canceled and no superseding document has been specified, the last published issue of that document shall apply. Copyright SAE
10、 International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE - 2 - AMS 3218C AMS 3218C2.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org. AMS 2279 Tolerances, Rubber
11、 Products AMS 2810 Identification and Packaging, Elastomeric Products AMS 3023 Fluid, Reference, for Testing Polyol Ester (and Diester) Resistant Materials PD 2000 Procedures for an Industry Qualified Product Management Process 2.2 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, P.O.
12、Box C700, West Conshohocken, PA 19428-2959 or www.astm.org. ASTM D 297 Rubber Products - Chemical Analysis ASTM D 395 Rubber Property - Compression Set ASTM D 412 Vulcanized Rubber and Thermoplastic Rubbers and Thermoplastic Elastomers - Tension ASTM D 471 Rubber Property - Effect of Liquids ASTM D
13、573 Rubber - Deterioration in an Air Oven ASTM D 1329 Rubber Property - Retraction at Lower Temperatures (TR Test) ASTM D 2240 Rubber Property - Durometer Hardness 3. TECHNICAL REQUIREMENTS: 3.1 Material: Shall be a compound, based on a fluorocarbon (FKM) elastomer, suitably cured to produce a produ
14、ct 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. 3.2 Properties: The product shall conform
15、to the requirements shown in Table 1; tests shall be performed on the product supplied and in accordance with ASTM Test Methods, insofar as practicable. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-
16、,-SAE - 3 - AMS 3218C AMS 3218CTABLE 1 - Properties Property Requirement Test Method 3.2.1 Hardness, Durometer “A” or equivalent 90 5 ASTM D 2240 3.2.2 Tensile Strength, min 1600 psi (11.02 MPa) ASTM D 412 3.2.3 Elongation, min 100% ASTM D 412 3.2.4 Specific Gravity Preproduction Value 0.02 ASTM D 2
17、97 (Hydrostatic Method) 3.2.5 Aromatic Fuel Resistance ASTM D 471 ASTM Ref. Fuel B 23 C 2 (73 F 5) 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 L
18、ubricant Resistance ASTM D 471 (Note A)AMS 3023 200 C 3 (392 F 5) 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 +25% Copyright SAE I
19、nternational Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE - 4 - AMS 3218C AMS 3218CTABLE 1 - Properties (Continued) Property Requirement Test Method 3.2.6.5 Compression Set, Percent of Original Deflection, max 25 ASTM D
20、395 Method B 3.2.7 Dry Heat Resistance ASTM D 573 270 C 3 (518 F 5) 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% 4.6.1 3.2.8 Compression Set: Percent of Original
21、Deflection, max 25 ASTM D 395 Method B 200 C 3 (392 F 5) 22 hours 0.5 3.2.9 Long-Term Compression Set: Percent of Original Deflection, max 65 200 C 3 (392 F 5) 336 hours 0.5 3.2.10 Low-Temperature Resistance Temperature Retraction, TR10, Point, max -15 C (+5 F) ASTM D 1329 (Note A) Do not dip specim
22、en in acetone; blot dry residual oil from specimen. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE - 5 - AMS 3218C AMS 3218C3.3 Properties After Humidity Aging on Brown Parts Only: The propertie
23、s shown in Table 2 shall be determined on brown specimens that have been aged for 28 days 2 hours at 25 C 2 (77 F 5) and 95% 3 relative humidity. TABLE 2 - Humidity Aged Properties Property Requirement Test Method 3.3.1 Tensile Strength, min 1600 psi (11.02 MPa) 3.3.2 Elongation, min 125% 3.3.3 Tens
24、ile Strength Change, max (1)-15% 3.3.4 Elongation Change, max (1)-15% 3.3.5 Synthetic Lubricant Resistance ASTM D 471 (Note A)AMS 3023 200 C 3 (392 F 5) 70 hours 0.5 3.3.5.1 Tensile Strength Change, max (2)-35% 3.3.5.2 Elongation Change, max (2)-20% 3.3.5.3 Compression Set, Percent of Original Defle
25、ction, max 20 3.3.6 Dry Heat Resistance After Humidity Age ASTM D 573 270 C 3 (518 F 5) 70 hours 0.5 Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE - 6 - AMS 3218C AMS 3218CTABLE 2 - Humidity Ag
26、ed Properties (Continued) Property Requirement Test Method 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 395 Method B 200 C 3 (392 F 5) 22 hours 0.5 (Note A) Do not dip specimens in acetone; blot dry r
27、esidual oil from specimens. (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 25 C 2 (77 F 5) and 95% 3 relative humidity. 3.4 Quality: Pr
28、oducts, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign materials as commercially practicable, and free from internal imperfections detrimental to usage of the product. 3.5 Sizes and Tolerances: Shall conform to all applicable requirements of AMS 227
29、9. 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The manufacturer 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 to ensure the product c
30、onforms to specified requirements. 4.2 Classification of Tests: 4.2.1 Acceptance Tests: Requirements shown in Table 3 are acceptance tests and shall be performed on each lot. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted witho
31、ut license from IHS-,-,-SAE - 7 - AMS 3218C AMS 3218CTABLE 3 - Acceptance Requirements Requirement ParagraphHardness 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 4.2.2 Preproduction Tests: All technical requirements shall be performed prior t
32、o or on the initial shipment of the product to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.2.2.1, and when purchaser deems confirmatory testing to be required. 4.2.2.1 Manufacturer shall use ingredients, manufacturing procedures, processes, and methods of
33、inspection on production product which are essentially the same as those used on the approval sample. If necessary to make any change in ingredients, in type of equipment for processing, or in manufacturing procedures, manufacturer shall submit for reapproval a statement of the proposed changes in i
34、ngredients and/or processing and, when requested, sample product. Production product made by the revised procedure shall not be shipped prior to receipt of reapproval. 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
35、perform all required tests. The number of determinations for each requirement shall be as specified in the applicable test procedure or, if not specified therein, not less than three, except as otherwise specified in 4.3.1.4. 4.3.1.1 If specimens cannot be prepared from the product, ASTM test specim
36、ens prepared from the same batch and state of cure shall be used. When the product supplied is an extrusion of such shape that suitable test specimens cannot be cut from the product, a separate flat strip test sample from the same production lot shall be supplied upon request. This strip shall be pr
37、epared from tubing 1.000 inch 0.063 (25.40 mm 1.60) in OD by 0.075 inch 0.008 (1.90 mm 0.20) in wall thickness, mechanically slit and flattened into a strip while being extruded, and cured in the same manner as production product. When the product is a molded shape from which test specimens cannot b
38、e cut, a slab 6 inches (152 mm) square by 0.075 inch 0.008 (1.90 mm 0.20) thick molded from the same batch of compound shall be supplied upon request. 4.3.1.2 A lot shall be all product produced from the same batch of compound processed in one continuous run and presented for manufacturers inspectio
39、n at one time. 4.3.1.3 For O-rings and compression, refer to AMS 7259. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE - 8 - AMS 3218C AMS 3218C4.3.1.4 A batch shall be the quantity of compound r
40、un through a mill or mixer at one time. 4.3.1.5 Final Inspection Sampling Plan: A statistical sampling plan acceptable to the purchaser may be used in lieu of sampling as in 4.3.1. Sample size for visual and dimensional requirements shall be as shown in Table 4; sample unit shall be one molded part
41、and acceptance based on zero defects. TABLE 4 - Visual and Dimensional Inspection Lot Size Sample Size2 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 4.3.2 Preproduction
42、 Tests: Acceptable to purchaser or as stated in the contract. 4.4 Approval: 4.4.1 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 shall constitute the approved proc
43、edures and shall be used for manufacturing production of seals. If necessary to make any changes in the parameters for process control factors, manufacturer shall submit for reapproval a statement of the proposed changes in ingredients and/or processing. Products manufactured using a revised procedu
44、re shall not be shipped prior to reapproval in writing. Manufacturer shall use ingredients, manufacturing procedures, processes, and methods of inspection in production which are essentially the same as those used on the approved sample. 4.4.1.1 Control factors for producing products include, but ar
45、e not limited to, the following: Compound ingredients and proportions thereof within established 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; va
46、riations of 10% are permissible Finishing methods Methods of inspection. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE - 9 - AMS 3218C AMS 3218C4.4.1.2 Any of the above process control factors
47、for which parameters are considered proprietary by the manufacturer may be assigned a code designation. Each variation in such parameters shall be assigned a modified code designation. 4.5 Test Methods: Shall be as follows: 4.5.1 Weight Loss Tests: The weight loss test shall be conducted on samples
48、air-aged at 270 C 3 (518 F 5). Test specimens shall be conditioned for 24 hours 2 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 Equation 1. Weight LossW1W2W1-100=(Eq. 1) where: W1= weight of sample before air-aging W2= weight of sample after air-aging 4.6 Reports: The supplier of the product shall furnish with each shipment a report from the manufac
