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/AMS3678/7AAEROSPACEMATERIALSPECIFICATIONAMS3678/7 REV. A Issued 2004-11 Reaffirmed 2006-06 R
5、evised 2010-11Supersedes AMS3678/7 Type 7 Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions with 25% Carbon and Graphite RATIONALE This document is being revised to clear up some editorial issues and to maintain the same revision date for AMS3678 and all the accompanying slash sheets. 1.
6、SCOPE 1.1 Form This specification covers a polytetrafluoroethylene (PTFE) resin filled with carbon and graphite 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 b
7、een used typically for parts such as backup rings and seal elements in both static and dynamic applications 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. 2. APPLI
8、CABLE DOCUMENTS See AMS3678. 3. TECHNICAL REQUIREMENTS 3.1 Basic Specification The complete requirements for procuring the products described herein shall consist of this document and the latest issue of the basic specification, AMS3678. Copyright SAE International Provided by IHS under license with
9、 SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS3678/7A Page 2 of 23.2 Material All products shall be molded or extruded from virgin polytetrafluoroethylene (PTFE) powder conforming to ASTM D 4894, Type II or Type IV, and should contain 23% 1 of Carbon a
10、nd 2% 0.5 of Graphite dispersed uniformily throughout the material. The Carbon powder should be a commercial grade of natural or synthetic carbon with 95% of the particles sized below 100 mesh with the remainder not exceeding 140 mesh. The Graphite powder should be natural or synthetic grade with 98
11、% of the particles sized below 200 mesh. 3.3 Properties The product shall conform to the requirements shown in Table 1. TABLE 1 - MATERIAL PROPERTY REQUIREMENTS Property Requirement Test Method 3.3.1 Tensile Strength, min 2000 psi (13.8 MPa) ASTM D 4894 3.3.2 Elongation, min 110% ASTM D 4894 3.3.3 S
12、pecific Gravity 2.00 to 2.15 ASTM D 792 3.3.4 Dimensional Stability 0.002 inch per 1 inch, max measured on circumference 4.5.3.1 of AMS3678 3.3.5 Color Dark gray to black and color should be uniform throughout 4. QUALITY ASSURANCE PROVISIONS See AMS3678. 5. PREPARATION FOR DELIVERY See AMS3678. 6. ACKNOWLEDGMENT See AMS3678. 7. REJECTIONS See AMS3678. 8. NOTES See AMS3678. PREPARED BY AMS COMMITTEE “P” Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
