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 2010 SAE International All rights reserved. No part of this publication
3、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 permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside
4、USA) 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/AMS3678CAEROSPACEMATERIALSPECIFICATIONAMS3678 REV. C Issued 1999-03 Revised 2010-11Supersedi
5、ng AMS3678BPolytetrafluoroethylene (PTFE) Moldings and Extrusions Unfilled, Pigmented, and Filled RATIONALE This document has been revised to better define product and express the test requirements more succinctly. Additional materials have also been added. 1. SCOPE 1.1 Form This specification cover
6、s several grades of virgin polytetrafluoroethylene (PTFE) resin which may be compounded with pigment and fillers in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process. 1.2 Application These products have
7、been used typically for the production of mechanical parts such as back-up rings, seals, and bearings requiring dimensional stability up to 450 F (232 C) with good mechanical properties, but usage is not limited to such applications. Each application should be considered individually. 1.3 Safety - H
8、azardous 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 ensur
9、e 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 DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this
10、specification to the extent supplied 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 of that document shall app
11、ly. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3678C Page 2 of 82.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323
12、 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AS4716 Gland Design, O-Ring and Other Elastomeric Seals AS5857 Gland Design, O-Ring and Other Elastomeric Seals, Static Applications 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West
13、 Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM D 792 Density and Specific Gravity (Relative Density) of Plastics by Displacement ASTM D 4745 Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials ASTM D 4894 Polytetrafluoroethylene (PTFE) Granular Mold
14、ing and Ram Extrusion Materials 2.3 U.S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.mil/quicksearch/.FED-STD-595 Colors Used in Government Procuremen
15、t 3. TECHNICAL REQUIREMENTS 3.1 Detail Specifications The requirements for a specific product shall consist of all requirements specified herein in addition to requirements specified in the applicable detail specification. In case of conflict between requirements of this specification and an applica
16、ble detail specification, requirements of the detail specification shall govern. 3.2 Material All products shall be molded or extruded from fresh virgin or filled polytetrafluoroethylene (PTFE) powder. The virgin PTFE powder used in both unfilled and filled compounds to this specification shall conf
17、orm to ASTM D 4894, Type II or Type IV. Type III PTFE powder is allowed for Type 12 and Type 13 materials. The blending of fillers with the virgin PTFE for each type shall be as shown in Table 1. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or netwo
18、rking permitted without license from IHS-,-,-SAE AMS3678C Page 3 of 8TABLE 1 - MATERIAL TYPES Type Description Detail Specification 1 Virgin PTFE, Grades A and B AMS3678/1A 2 PTFE filled with 15% graphite AMS3678/2 3 PTFE filled with 15% glass fiber and 5% molybdenum disulfide AMS3678/3 4 PTFE fille
19、d with 25% glass fiber AMS3678/4 5 PTFE filled with inorganic pigment AMS3678/5 6 PTFE filled with 60% bronze powder AMS3678/6 7 PTFE filled with 23% carbon and 2% graphite AMS3678/7 8 PTFE filled with 10% carbon fiber AMS3678/8 9 PTFE filled with inorganic pigment (AS4716 tests shall be performed o
20、n production product in accordance with specified test methods, insofar as practicable. The tests shall be performed on test specimens removed from the extruded or molded rods and tubes used to produce parts machined from this material. 3.3.1 Color shall be as described for each type with no discolo
21、ration or inclusions detrimental to the performance requirements of the final components. For Type 5, color is solely dependent upon pigment chosen by the supplier. 3.4 Quality Moldings or extrusions as received by purchaser shall be uniform in quality and color, smooth, as free from foreign materia
22、l as commercially practicable, and free from internal imperfections detrimental to usage of the material. 3.5 Sizes and Tolerances Dimensions and tolerances of moldings or extrusions shall be as agreed upon by purchaser and supplier or as stated on purchase order. 4. QUALITY ASSURANCE PROVISIONS 4.1
23、 Responsibility for Inspection The manufacturer of moldings or extrusions shall supply all test coupons and shall be responsible for the performance of all required tests for each lot of moldings or extrusions. Purchaser reserves the right to sample and to perform any confirmatory testing deemed nec
24、essary to ensure that the moldings or extrusions conform to the specified requirements. Manufacturer of machined parts shall furnish substantiating test data acquired by the manufacturer of moldings or extrusions. Purchaser of parts machined from moldings or extrusions also reserves the right to per
25、form confirmatory testing provided the parts will yield test coupons that conform to the testing procedure(s) listed in 4.5. 4.2 Classification of Tests 4.2.1 Acceptance Tests All technical requirements are acceptance tests and shall be performed on each lot of moldings or extrusions (See 4.3.1.2).
26、4.3 Sampling and Testing Shall be as follows: 4.3.1 Acceptance Tests Sufficient test coupons shall be taken at random from each molding or extrusion lot to perform required tests. The number of determinations for each requirement shall be as specified in the applicable test procedure or, if not spec
27、ified, not less than three. 4.3.1.1 A batch of either virgin PTFE polymer or filled or pigmented PTFE polymer shall not exceed 4400 pounds (2000 kg). 4.3.1.2 A lot of moldings or extrusions shall be all the rods or tubes made from the same batch of compound in one continuous run and presented for ma
28、nufacturers inspection at one time. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3678C Page 6 of 84.3.1.3 A statistical sampling plan, acceptable to purchaser, may be used in lieu of sampli
29、ng as in 4.3.1 and the report of 4.6 shall state that such plan was used. 4.4 Approval 4.4.1 Test results from sample product shall be approved by purchaser before production moldings or extrusions are supplied, unless such approval is waived by purchaser. Results of the tests on samples from the pr
30、oduction lot shall be essentially equivalent to those on the approved sample. Production product made by a revised procedure shall not be shipped prior to receipt of reapproval. If necessary to make any change in parameters for the process control factors, manufacturer shall submit for reapproval a
31、statement of the proposed changes in ingredients and/or processing and, when requested, sample product. 4.4.2 Manufacturer of the product shall make no significant change in material, processes, or control factors from those on which the approval was based, unless the change is approved by the cogni
32、zant engineering organization. A significant change is one which, in the judgment of the cognizant engineering organization, could affect the properties or performance of the product. 4.5 Test Methods Shall be as follows: 4.5.1 Tensile strength and elongation shall be determined in accordance with A
33、STM D 4894 and the test specimens shall be prepared from either a production molding or extrusion as specified or from a sample molding or extrusion of sufficient size. Test specimens for rods and tubes, where size permits, shall conform to ASTM D 4894, Figure 11, except that rods 0.250 inch (6.35 m
34、m) and under in diameter may be tested in full cross-section. The initial jaw separation shall be 0.875 inch 0.005 (22.2 mm 0.13) and the speed of testing shall be as specified for each type per ASTM D 4745 or ASTM D 4894. Type 5 material should be tested in accordance with the requirements of Type
35、1 material. 4.5.1.1 For compression molded material, the sample should be pulled in the direction of molding (axial direction) where physical dimensions permit. Where this is not possible, the sample should be perpendicular to the direction of molding (circumferential direction). For isostaticly mol
36、ded rods or tubes, the sample may be taken from either the axial or circumferential direction. For extrusions, the sample should be pulled in the direction of extrusion (axial direction). The values shown for each type are the minimum values required. 4.5.2 Specific gravity shall be determined in ac
37、cordance with ASTM D 792, Method A with two drops of wetting agent added to the water. 4.5.3 Dimensional Stability The dimensional stability test shall be carried out on sample rings. 4.5.3.1 Dimensional Stability Test Sample rings cut from the moldings or extrusions shall be subjected to air aging
38、for a minimum of 1 hour at 350 F 10 (177 C 6) and allowed to cool to room temperature in free air at ambient temperature. The samples shall not exhibit a change in circumferential length of more than 0.2% (i.e., 0.002 inch per inch). 4.6 Reports The supplier of moldings or extrusions shall furnish w
39、ith each shipment a report from the manufacturer showing the results of tests on each lot to determine conformance to the tensile strength, elongation, specific gravity, and stability testing requirements and stating that the moldings or extrussions conform to the other technical requirements. This
40、report shall include the purchase order number, lot number, AMS3678C and its applicable type or detail specification number, manufacturers identification number, form and size or part number, and quantity. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproductio
41、n or networking permitted without license from IHS-,-,-SAE AMS3678C Page 7 of 84.7 Resampling and Retesting If any specimen used in the above tests fails to meet the specified requirements, disposition of the product may be based on the results of testing three additional specimens for each original
42、 nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the rods and tubes produced in this lot. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Packaging and Identification Shall be as specified in the purcha
43、se order or contract requirements. 5.1.1 Each package shall be permanently and legibly marked to show not less than the following information: Polytetrafluoroethylene (PTFE) Moldings or Extrusions AMS3678C and Type Number and Grade, if applicable Size or Part Number Manufacturers Identification Lot
44、Number QuantityPurchase Order Number 5.1.2 A lot may be packaged in small quantities and delivered either together or separately under the lot approval provided lot identification is maintained. 6. ACKNOWLEDGMENT Supplier shall mention this specification number, its revision letter, and the applicab
45、le type number in all quotations and when acknowledging purchase orders. 7. REJECTIONS Product not conforming to this specification and the applicable detail specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (l) located in the left ma
46、rgin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars
47、 and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius t
48、emperatures are shown as the approximate equivalents of the primary units and are presented only for information. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3678C Page 8 of 88.4 Purchase documents should specify not less than the following: AMS3678C Material Type required Form and size or part number of product desired Quantity of product desired Dimensional stability testing, if required Color or grade, if applicable. PREPARED BY AMS COMMITTEE “P” Copyright SAE Interna
