We had same problem with a batch of ceramic chip capacitors some years ago. Only way to get rid of the stiff whiskers was reflowing. Maybe Steve got a place on the wall for my photo, which shows one end of a chip cap. Pure tin, disaster! Inge -----Ursprungligt meddelande----- Från: TechNet [mailto:[log in to unmask]] För Gary Camac Skickat: den 18 november 2005 21:57 Till: [log in to unmask] Ämne: [TN] Tin whiskers on 0402's in the reel. Good afternoon, We have had a problem today with a reel of 0402 resistors where the placement machine would not pick some of the parts out of the tape (paper). A part I examined would not fall out of the pocket when the feeder was turned upside down. I examine the part sitting in the pocket and it appeared to be jammed into one corner. After some tapping on the feeder the part dislodged. When I examined the part under a microscope, I noticed a filament attached to the bottom of the part starting at the corner of the electrode. The following part in the tape would, likewise, not fall out until persuaded. This part fell into my hand and when I examined it under the scope I could see a filament lying beside it in my palm. These parts are a 2002 date code. Tin whisker? Anyone seen this before? I took the reel on components to our environmental test lab, bolted it to the sinusoidal vibration table and shook for about a minute. We then reinstalled the reel on the placement machine and the picking problem went away. Interesting stuff for a Friday afternoon. Gary Camac Senior Mfg. Eng. Dickey-john Corp. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 -----------------------------------------------------