Go to http://www.empf.org. The organization has been around for a very long time and started up in China Lake with the Navy. I worked for the Navy Warfare Center in Indianapolis IN for years and the EMPF resided there for about 4 years before moving to PA. They have a lot of papers on lead free issues including Tin Whiskers. Part of there organization is ACI. From what I know bright tin is not good but matte tin is better. Jon -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins Sent: Thursday, June 12, 2008 2:13 PM To: [log in to unmask] Subject: [TN] Tin Whiskers - how long? Size matters! Good day TechNet A tin whisker question. If (hypothetically, as this thankfully hasn't been built yet) a pure tin finish part is used, what sort of length whisker could happen? What we are looking at is this: a part we want to use is only available with a pure tin finish on copper. Matte tin, not bright. So if we use it, and a tin whisker grows, how long might it grow? If the part is (for example) 10mm away from adjacent parts, and a realistic maximum whisker length is less than that, it obviously mitigates (YES, but does not entirely remove) the risk. The only value I've seen is in a Dave Hillman/Doug Pauls presentation from Apex 05, wherein it is stated that they "can be 9.5mm long". Dave / Doug, any comment on this? Can you cite a source? Does matte vs bright tin make a difference? regards, Graham Collins Halifax Production Engineering (902) 873-2000 ext. 6215 --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- This communication is intended only for use by the addressee(s) named herein and may contain business confidential and/or legally privileged information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution, disclosure or copying of this e-mail and its contents is strictly prohibited. If you have received this e-mail in error, kindly notify the sender by replying to this message. In addition, please permanently delete the message and any attachments without copying or disclosing the contents. Thank you for your cooperation. THIS DOCUMENT AND/OR SHIPMENT MAY CONTAIN COMMODITY ITEMS, SOFTWARE OR TECHNICAL DATA THAT IS CONTROLLED BY U.S. EXPORT LAW, AND MAY NOT BE EXPORTED OUTSIDE THE UNITED STATES OR TO NON U.S. PERSONS WITHOUT THE APPROPRIATE EXPORT LICENSE FROM EITHER THE U.S. DEPARTMENT OF STATE OR DEPARTMENT OF COMMERCE. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------