"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." " Steve, It is possible the mask was put on a little thick (excessive wet film thickness). The operator may have used a mesh that allowed too much ink to go down. May ask them whose ink, method of application (screen, spray, etc.) Another possibility is entrapped solvents, especially around high circuit traces. Check the pre-dry prior to exposure Good luck, Mike Carano -----Original Message----- From: Stephen R. Gregory [SMTP:[log in to unmask]] Sent: Wednesday, July 26, 2000 2:11 PM To: [log in to unmask] Subject: [TN] "Bubbly Soldermask..." Hi all! We just got some boards in at receiving inspection that have thousands of little "bubbles" in the soldermask all over the boards...they seem to concentrate all along the edges of the features of the board. You can see pictures of it at: http://www.driveway.com/share?sid=e25a88c4.8e904&name=Pictures One picture is bubblemask.jpg, the other is bubblemask2.jpg...what would cause that? It's a LPI...don't know the brand name. I'm thinking that either the boards weren't dry or cleaned well prior to soldermasking them. I'm rejecting the boards of course... My freedrive is filling up fast with all the pictures of the "pretty boards" that we get from our vendors!!! -Steve Gregory- ############################################################## 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 ##############################################################