Thank you all for your answers. Anyone has a picture of dendrites? -----Original Message----- From: [log in to unmask] [mailto:[log in to unmask]] Sent: Thursday, March 21, 2002 2:44 PM To: [log in to unmask] Subject: Re: [TN] Dendrites growth In a message dated 3/21/2002 10:24:53 AM US Eastern Standard Time, [log in to unmask] writes: << Is conformal coating a good protection against dendrites? >> Graham's answer is a very good one. In a way, this question reminds me of an advertisement that I often saw in bicycling magazines during my college days. It was for a new type of lock to hold one's bicycle to the parking rack, and it had for a headline "Resists Atomic Bombs". The key being that it was not 100% successful, but it did offer resistance. In every comparative test that I have ever done, uncoated boards fared far worse than coated ones with respect to dendritic growth. Does that mean that conformal coating will prevent dendrites from EVER appearing? Clearly not. My typical tests were 100 hours at 85 C and 85% RH, with power applied, with the acrylic coated boards normally surviving the entire test and the uncoated boards failing in 2-8 hours, depending on the soldering process variables involved. Jon Moore ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- WABTEC CORPORATION CONFIDENTIALITY NOTE The content contained in this e-mail transmission is legally privileged and confidential information intended only for the use of the individual or entity named herein. If the reader of this transmission is not the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this transmission is strictly prohibited. --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------