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 theref
2、rom, 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 2013 SAE InternationalAll rights reserved. No part of this publication may b
3、e 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 USA)Fax
4、: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS3347CAEROSPACEMATERIALSPECIFICATIONAMS3347 REV. CIssued 1967-04Reaffirmed 2003-11Revised 2014-05Supers
5、eding AMS3347BRubber, Silicone1200 psi (8.27 MPa), High Modulus45 - 55RATIONALEAMS3347C results from a Five Year Review and update of this specification.1. SCOPE1.1 FormThis specification covers a silicone rubber material that can be used to manufacture product in the form of sheet, strip, tubing, e
6、xtrusions, and molded shapes.This specification should not be used to address products such as O-rings, compression seals, O-ring cord, and molded-in-place gaskets.1.2 ApplicationThese products have been used typically for parts required to operate or seal from -103 to +401 F (-75 to +205 C), compou
7、nded especially for high strength, but usage is not limited to such applications. Silicone elastomer is resistant to deterioration by weathering and by high-aniline-point petroleum-base oils and remains flexible over the temperature range noted. These products are not normally suitable for use in co
8、ntact with gasoline or aromatic fuels and low-aniline-point petroleum-base fluids due to excessive swelling.1.3 Terms / Definitions1.3.1 “Material”The mixed rubber compound used to manufacture product.1.3.2 “Product”The end product being supplied to the contract/purchase order originator, usually in
9、 the form(s) specified in 1.1 above.1.3.3 “Lot”Shall be all product from the same batch of compound processed in one continuous run and submitted for inspection at one time. The material batch size allowed to form any single inspection lot of product shall not exceed 500 pounds (227 kg).SAE AMS3347C
10、 Page 2 of 81.3.4 “Batch”Shall be the quantity of compound run through a mill or mixer at one time.(Note: Smaller batches of mixed compound may be formed into a larger batch by utilizing a cross blending process that insures the homogenous nature of the newly formed larger batch. When utilizing this
11、 process all ingredient traceability of the smaller batches must be maintained and directly tied to the resulting larger batch. Only the resulting larger batch needs to be subject to Batch Acceptance Testing requirements of this specification.)1.3.5 “Mixer”The vendor in the supply chain that perform
12、s the actual mixing of the Rubber Compound utilized to produce product.1.3.6 “Masterbatch”A batch of compound that has been mixed to completely incorporate most of the compound ingredients, omitting the active chemicals that constitute the cure system. Typically for silicone compounds this includes
13、catalysts and color pigments.1.3.7 “Material Rework”Minor adjustments made to the existing ingredient content levels of a compound recipe, while still remaining within the tolerance limits of the recipe, which may enhance physical property or processability performance, yet still maintain the origin
14、al compound identity.1.4 Safety - Hazardous MaterialsWhile 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 r
15、esponsibility 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 safety of all personnel involved.2. APPLICABLE DOCUMENTSThe issue of the following documents in effect on the date of the purc
16、hase 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 is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published
17、 issue of that document shall apply.2.1 SAE PublicationsAvailable 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.AMS 2279 Tolerances, Rubber ProductsAMS 2810 Identification and Packaging,
18、 Elastomeric Products2.2 ASTM PublicationsAvailable 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 Standard Test Methods for Rubber Products - Chemical Analysis ASTM D 395 Standard Test Methods for Rubber Pr
19、operty - Compression Set ASTM D 412 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers Tension SAE AMS3347C Page 3 of 8ASTM D 471 Standard Test Methods for Rubber Property - Effect of Liquids ASTM D 573 Standard Test Method for Rubber - Deterioration in an Air Oven ASTM D 624 S
20、tandard Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers ASTM D 2137 Standard Test Methods for Rubber Property - Brittleness Point of Flexible Polymers and Coated FabricsASTM D 2240 Standard Test Method for Rubber Property - Durometer Hardness ASTM D 3182
21、Standard Practice for Rubber Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets.2.2 ASQ PublicationsAvailable from American Society for Quality (ASQ), 600 North Plankinton Ave., Milwaukee, WI 53203, www.asq.orgANSI/ASQ-Z1.4 Sampling Procedures
22、 and Tables for Inspection by Attribute3. TECHNICAL REQUIREMENTS3.1 MaterialShall be a compound based on a silicone rubber, suitably cured to produce a product meeting the requirements of 3.2.3.1.1 Toxicological FormulationsThe material shall have no adverse effects on the health of personnel when u
23、sed for its intended purpose in accordance with manufacturers instructions and with appropriate handling procedures.3.1.2 ColorThe color of the material shall be as specified on available design data or per customer contract. When no color is specified, the color shall be the natural color of the co
24、mpound furnished.3.2 PropertiesThe product shall conform to the requirements shown in Table 1; tests shall be performed in accordance with specified ASTM methods, insofar as practicable (also see 4.2.3):SAE AMS3347C Page 4 of 8TABLE 1 - REQUIREMENTSParagraph Test Requirement Test Method3.2.1 Origina
25、l Properties 3.2.1.1 Hardness, Durometer “A”or equivalent 50 5ASTM D 22403.2.1.2 Tensile Strength,minimum1200 psi(8.27 MPa)ASTM D 412, Die B or C3.2.1.3 Elongation, minimum 500% ASTM D 412, Die B or C3.2.1.4 Tear Resistance,minimum150 pounds forceper inch(26.3 kN/m)ASTM D 624, Die B3.2.1.5 Specific
26、Gravity PreproductionValue 0.03ASTM D 2973.2.2 Petroleum Lubricating Oil Resistance(Immediate Deteriorated Properties)ASTM D 471Medium: ASTM Oil No. 1Temperature: 347 F 53.2.2.1 Hardness Change,Durometer “A“or equivalent -15 to +5(175 C 3)Time: 70 hours 0.53.2.2.2 Tensile StrengthChange, maximum -35
27、%3.2.2.3 Elongation Change,maximum -30%3.2.2.4 Volume Change 0 to +10%3.2.2.5 Decomposition None3.2.2.6 Surface Tackiness None3.2.3 Dry Heat Resistance ASTM D 573Temperature: 437 F 5(225 C 3)3.2.3.1 Hardness Change,Durometer “A” orequivalent 0 to +10Time: 22 hours 0.53.2.3.2 Tensile StrengthChange,
28、maximum -25%3.2.3.3 Elongation Change,maximum -25%3.2.4 Compression Set ASTM D 395, Method BTemperature: 347 F 53.2.4.1 Percent of OriginalDeflection, maximum 50(175 C 3)Time: 22 hours 0.53.2.5 Low-Temperature Resistance3.2.5.1 Brittleness Pass ASTM D 2137, Method ATemperature: -103 F 5(-75 C 3)Time
29、: 3 minutes 0.3SAE AMS3347C Page 5 of 83.3 Product QualityThe product, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign materials as commercially practicable, and free from imperfections detrimental to usage of the product3.4 Dimensions and Tolerances
30、Dimensions and tolerances shall be as specified in the parts standard, drawing, other design data, or purchase document, and shall conform to all applicable requirements of AMS2279.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe manufacturer of the product shall be responsible to
31、 assure that all required material testing and product inspection has been performed and that the data is available. Unless specified otherwise by contractual requirements, testing may be performed either at the product manufactures own test facility, at the mixer, or at a suitable independent test
32、facility. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements.4.2 Classification of Tests4.2.1 Preproduction TestingPreproduction testing shall consist of all of the Physical Property requiremen
33、ts listed in Table 1 and shall be performed prior to certification of materials to this Specification. Compound preproduction testing is valid for a period of three (3) years or until preproduction re-testing may be required (See 4.2.1.1). Objective evidence of this testing must be kept on file and
34、available for review during the validity period.4.2.1.1 Preproduction retesting shall be required if one of the following occurs:x At the end of the current three year preproduction testing validity period or;x When a change in ingredients and/or processing requires re-approval as in 4.5.2 - or;x Up
35、on three consecutive failures of batch Acceptance Testing or,x When the Purchaser contractually requires that preproduction Testing be performed.4.2.2 Acceptance TestsThe following requirements are acceptance tests and shall be performed on each lot of product (See 4.1) in accordance with Table 2.TA
36、BLE 2 - ACCEPTANCE TEST REQUIREMENTSParagraph Requirement ReferenceHardness, Original Properties 3.2.1.1Tensile Strength, Original Properties 3.2.1.2Elongation, Original Properties 3.2.1.3Specific Gravity, Original Properties 3.2.1.5Compression Set 3.2.44.2.3 Test Samples4.2.3.1 For Qualification Te
37、sting, specimens shall be prepared from 6 inch (152 mm) square by 0.075 inch 0.008 (1.90 mm 0.20) thick molded test slabs per ASTM D3182 compounded for the same intended curing process as the end product.SAE AMS3347C Page 6 of 84.2.3.2 For Acceptance Testing, sufficient material shall be taken at ra
38、ndom from each lot of product to provide specimens to 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 (See 4.2.3.3 below). If specimens cannot be prepared from the p
39、roduct, test specimens prepared from the same batch of material and in the same state of cure as the product shall be used.4.2.3.2.1 When the product supplied is an extrusion of such shape that suitable test specimens cannot be cut from the product, a separate extruded flat strip test sample, 3.0 in
40、ches 0.25 (76.2 mm 6.4) by 0.075 inch 0.008 (1.90 mm 0.20) thick, produced from the same production batch of compound, in the same state of cure as the product being supplied, shall be used to prepare test specimens. 4.2.3.2.2 When the product is a molded item of such shape that suitable test specim
41、ens cannot be cut, a slab 6 inches (152 mm) square by 0.075 inch 0.008 (1.90 mm 0.20) thick per ASTM D3182, molded from the same batch of compound, in the same state of cure as the product being supplied, shall be used to prepare test specimens.4.2.3.3 Specimen Test ValuesAll individual specimen tes
42、t result values used to determine pass/fail criteria must be within acceptable limits as indicatedin Table 1. Where Test Methods dictate that results be reported as Average or Median values, failed values shall not be allowed in these calculations, (see 4.2.4).4.2.4 Retesting and Rework4.2.4.1 If an
43、y specimen fails to meet the pass/fail criteria as listed in Table 1, a retesting of three (3) additional specimens with acceptable results for each nonconforming specimen, shall be necessary for acceptance. The same material batch as was used for the failed test shall be used for retesting. Failure
44、 of any retest specimen shall be cause for rejection of the batch along with the rejection of any product that may have been produced from the batch. Results of all tests shall be reported. Records of all rejections and material rework shall be maintained.4.2.4.1.1 Individual specimen failures that
45、occur due to obvious flaws in the specimen itself or because of mechanical failure of the test equipment, may be disregarded with only a single retest specimen required for acceptance. All such occurrences must be recorded.4.2.4.2 Any rejected batch that has undergone material rework because of fail
46、ed Acceptance Testing must be retested to the full Acceptance Criteria, not just the failed test.4.2.4.3 No batch may be reworked more than two (2) times.4.3 SamplingWhen a statistical sampling plan for product acceptance has been agreed upon by purchaser and vendor, sampling shall be in accordance
47、with such plan and the report of 4.6 shall state that such plan was used , otherwise sampling shall be in accordance with ANSI/ASQ-Z1.4, Single Sampling Plan, Inspection Level II, AQL 1.0, except that the acceptance number shall be zero (0).4.4 CertificationCertification to this Material Specificati
48、on shall only be permitted if all testing requirements specified in 4.2 have been met.4.5 Approval4.5.1 When the contract requires that sample product be submitted for approval by the purchaser before product for production use is supplied, results of tests on production product shall be essentially
49、 equivalent to those on the approved sample.4.5.2 The vendor(s) shall use ingredients, manufacturing procedures, processes, and methods of inspection on production product which are essentially the same as those used on the qualified product. If necessary to make SAE AMS3347C Page 7 of 8any change in ingredients*, in type of equipment for processing, or in manufacturing procedu
