1、AEROSPACE MATERIAL SPECIFICATION AMS3345 REV. F Issued 1956-07 Reaffirmed 2001-10 Revised 2015-03 Superseding AMS3345E Silicone Rubber 1000 psi (6.89 MPa) Minimum Tensile Strength 45 55 Durometer RATIONALE AMS3345 Specification was updated for the five year review. 1. SCOPE 1.1 Form This specificati
2、on covers a silicone rubber material that can be used to manufacture product in the form of sheet, strip, tubing, molded shapes, and extrusions. This specification should not be used to address products such as O-rings, compression seals, O-ring cord, and molded-in-place gaskets. For these applicati
3、ons AMS specifications in the AMS7XXX series should be used. 1.2 Application These products have been used typically for parts required to operate or seal from -130 to +401 F (-90 to +205 C), compounded especially for high strength, but usage is not limited to such applications. Silicone elastomer i
4、s resistant to deterioration by weathering and aircraft piston engine oil and remains flexible over the temperature range noted. This rubber is not normally suitable for use in contact with gasoline or aromatic fuels and low-aniline-point petroleum-base fluids due to excessive swelling of the elasto
5、mer. 1.3 Terms / Definitions 1.3.1 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 the form(s) specified in 1.1 above. _ SAE Technical Standards Board Rules provide that: “This report i
6、s 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 therefrom, is the sole responsibility of the user.” SAE reviews each te
7、chnical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or tran
8、smitted, 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: 724-776-0790 Email: CustomerServicesae.org SA
9、E 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/AMS3345F SAE INTERNATIONAL AMS3345F Page 2 of 8 1.3.3 LOT Shall be all products from the same batch of compound processed in one continuous run and
10、 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). 1.3.4 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
11、a larger batch by utilizing a crossblending process that insures the homogenous nature of the newly formed larger batch. When utilizing this process all ingredient traceability of the smaller batches must be maintained and directly tied to the resulting larger batch. Only the resulting larger batch
12、needs to be subject to Batch Acceptance Testing requirements of this specification.) 1.3.5 MIXER The vendor in the supply chain that performs 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
13、 of thecompound ingredients, omitting the active chemicals that constitute the cure system. Typically for silicone compounds this includes catalysts and color pigments. 1.3.7 MATERIAL REWORK Minor adjustments made to the existing ingredient content levels of a compound recipe, while remaining within
14、 the tolerance limits specified in the recipe, which may enhance physical properties or processability performance, yet still maintain the original compound identity. 1.4 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in this specificat
15、ion 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 the safe and proper use of any hazardous materials and to take necessary precautionary measures to e
16、nsure 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 the extent specified herein. The supplier may work to a subsequent revision of a document unless a spe
17、cific document 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. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877
18、-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2279 Tolerances, Rubber Products AMS2810 Identification and Packaging, Elastomeric Products SAE INTERNATIONAL AMS3345F Page 3 of 8 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O.
19、Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM D297 Standard Test Methods for Rubber Products - Chemical Analysis ASTM D395 Standard Test Methods for Rubber Property - Compression Set ASTM D412 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomer
20、s Tension ASTM D471 Standard Test Methods for Rubber Property - Effect of Liquids ASTM D573 Standard Test Method for Rubber - Deterioration in an Air Oven ASTM D624 Standard Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers ASTM D2137 Standard Test Methods
21、for Rubber Property - Brittleness Point of Flexible Polymers and Coated Fabrics ASTM D2240 Standard Test Method for Rubber Property - Durometer Hardness ASTM D3182 Standard Practice for Rubber Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets
22、 3. TECHNICAL REQUIREMENTS 3.1 Material Shall be a compound, based on a silicone rubber, suitably cured to produce a product meeting the requirements of 3.2. 3.1.1 Toxicological Formulations The material shall have no adverse effects on the health of personnel when used for its intended purpose in a
23、ccordance with manufacturers instructions and with appropriate handling procedures. 3.1.2 Color The 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 compound furnished. 3.2 Physical
24、Properties The 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 INTERNATIONAL AMS3345F Page 4 of 8 Table 1 - Properties Paragraph Property Requirement Test Method 3.2.1 Origina
25、l Properties 3.2.1.1 Hardness, Durometer “A“ or equivalent 50 5 ASTM D2240 3.2.1.2 Tensile Strength, minimum 1000 psi (6.89 MPa) ASTM D412, Die B or C 3.2.1.3 Elongation, minimum 450% ASTM D412, Die B or C 3.2.1.4 Tensile Stress at 100% Elongation, minimum 90 psi (621 kPa) ASTM D412, Die B or C 3.2.
26、1.5 Tear Strength, minimum 150 pounds force per inch (26.3 kN/m) ASTM D624, Die B 3.2.1.6 Specific Gravity Preproduction Value 0.03 ASTM D297 3.2.2 Petroleum Lubricating Oil Resistance (Immediate Deteriorated Properties) 3.2.2.1 Hardness Change, Durometer “A“ or equivalent -15 to +5 ASTM D471 Medium
27、: ASTM Oil No. 1 Temperature: 302 F 5 (150 C 3) Time: 70 hours 0.5 3.2.2.2 Tensile Strength Change, maximum -40% 3.2.2.3 Elongation Change, maximum -40% 3.2.2.4 Volume Change 0 to +15% 3.2.2.5 Decomposition None 3.2.2.6 Surface Tackiness None 3.2.3 Dry Heat Resistance 3.2.3.1 Hardness Change, Durome
28、ter “A“ or equivalent 0 to +15 ASTM D573 Temperature: 392 F 5 (200 C 3) Time: 70 hours 0.5 3.2.3.2 Tensile Strength Change, maximum -40% 3.2.3.3 Elongation Change, maximum -50% 3.2.4 Compression Set 3.2.4.1 Percent of Original Deflection, maximum 55 ASTM D395, Method B Temperature: 347 F 5 (175 C 3)
29、 Time: 22 hours 0.5 3.2.5 Low-Temperature Resistance 3.2.5.1 Brittleness Pass ASTM D2137, Method A Temperature: -130 F 5 (-90 C 3) 3.3 Product Quality The product, as received by purchaser, shall be uniform in quality and condition, smooth, as free from foreign material as commercially practicable,
30、and free from imperfections detrimental to usage of the product. 3.4 Dimensions and Tolerances 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. SAE INTERNATIONAL AMS33
31、45F Page 5 of 8 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of the product shall be responsible to assure that all required material testing and product inspection has been performed and that the data is available. Unless specified otherwise by contractual requiremen
32、ts, testing may be performed either at the product vendors own test facility, at the mixer, or at a suitable independent test 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 C
33、lassification of Tests 4.2.1 Qualification Testing Qualification Testing shall consist of all of the Physical Property requirements listed in Table 1 and shall be performed prior to certification of materials to this Specification. Compound Qualification testing is valid for a period of three (3) ye
34、ars or until Qualification re-testing may be required (See 4.2.1.1). Objective evidence of this testing must be kept on file and available for review during the validity period. 4.2.1.1 Qualification retesting shall be required if one of the following occurs: At the end of the current three year Qua
35、lification Testing validity period or; When a change in ingredients and/or processing requires re-approval as in 4.5.2 - or; Upon three consecutive failures of batch Acceptance Testing or, When the Purchaser contractually requires that Qualification Testing be performed. 4.2.2 Acceptance Tests The f
36、ollowing requirements are acceptance tests and shall be performed on each batch of mixed compound (See 4.1) in accordance with Table 2. Each production batch that may have been drawn from a larger uncatalyzed masterbatch, and then had the catalyst incorporated, shall be subject to this requirement.
37、Table 2 Acceptance tests Requirement Paragraph Reference Hardness, Original Properties 3.2.1.1 Tensile Strength, Original Properties 3.2.1.2 Elongation, Original Properties 3.2.1.3 Specific Gravity, Original Properties 3.2.1.6 Compression Set 3.2.4 4.2.3 Test Samples 4.2.3.1 For Qualification Testin
38、g, 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. 4.2.3.2 For Acceptance Testing, sufficient material shall be taken at random from each lot of produ
39、ct 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 product, test specimens prep
40、ared from the same batch of material and in the same state of cure as the product shall be used. At a minimum, specific gravity tests shall be conducted on the end item or a section removed from the end item (except as noted in 4.2.3.2.3 below). SAE INTERNATIONAL AMS3345F Page 6 of 8 4.2.3.2.1 When
41、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 inches 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 o
42、f 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 specimens 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
43、compound, in the same state of cure as the product being supplied, shall be used to prepare test specimens. 4.2.3.2.3 When the mixer of the material is not the actual manufacturer of the end product, specimens shall be prepared from 6 inch (152 mm) square by 0.075 inch 0.008 (1.90 mm 0.20) thick mol
44、ded test slabs per ASTM D3182, catalyzed and cured equivalent to the intended curing process for the end product. 4.2.3.3 Specimen Test Values All individual specimen test result values used to determine pass/fail criteria must be within acceptable limits as indicated in Table 1. Where Test Methods
45、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 Rework 4.2.4.1 If any specimen fails to meet the pass/fail criteria as listed in Table 1, a retesting of three (3) additional specimens with accepta
46、ble 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 of any retest specimen shall be cause for rejection of the batch along with the rejection of any product that may have been prod
47、uced 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 occur due to obvious flaws in the specimen itself or because of mechanical failure of the test equipment may be disregarded with
48、 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 failed Acceptance Testing must be retested to the full Acceptance Criteria, not just the failed test. 4.2.4.2.1 No batch may be reworked more than two (2) times. 4.3 Sampling When a statistical sampling plan for product acceptance has been agreed upon by purchaser and vendor, sampling shall be in accordance with such plan and the report of 4.6 shall state that such plan was used, otherwise sampling sh
