"NOTE: The information in this e-mail is confidential and may be legally privileged. If you are not the intended recipient please notify the sender immediately and then delete this e-mail. You must not read, copy, use or disseminate this e-mail or any information in it . Although this e-mail and any attachments are believed to be free of any virus or other defects which might affect any computer or IT system into which they are received, no responsibility is accepted by Laporte plc or any of its associated companies for any loss or damage arising in any way from the receipt or use thereof. Any opinions expressed in this e-mail or any attachments are those of the individual sender and not necessarily the Company." " Cara, Dave is correct. Colin Lea published a series of papers on the subject of blowholes. Part 1, Part II, Part III - Vol. 12 No. 4, 1986 Part 4, Part IV, Part VI- Vol. 13, No. 4, 1986 Circuit World- MCB UP Limited Phone: 44-1274 777700 Fax: 44-1274 785200 Best regards, Mike Carano -----Original Message----- From: David Hillman [SMTP:[log in to unmask]] Sent: Wednesday, August 09, 2000 2:21 PM To: [log in to unmask] Subject: Re: [TN] Blow Holes Hi Cara! Take a look at Klein Wassink's book (ISBN 0-901150-14-2) , chaper 8.1.3 and the reference papers in that section for information on the cause for blowholes. I can't find my references but I believe Colin Lea did a multi-article spread on the physics of blowholing in Circuit World magazine. Good Luck. Dave Hillman Rockwell Collins [log in to unmask] "Cara.Startek" <[log in to unmask]>@IPC.ORG> on 08/09/2000 01:52:17 PM Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to "Cara.Startek" <[log in to unmask]> Sent by: TechNet <[log in to unmask]> To: [log in to unmask] cc: Subject: [TN] Blow Holes I'm having a problem with blow holes occurring in a thick board that I'm running on a wave solder machine. As a test I am going to bake the boards for 24hrs to remove moisture from the board and eliminate this as a cause of the problem. Is there any thing else that cold be causing blow holes? Cara Startek Process Engineering http://www.leitch.com ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################