Hi Folks: We have a debate regarding sequence of operations when we glue down components and apply conformal coating to the same board. The IPC-A-610C does not cover this and I have not been able to locate any other info. Basicly we want to know, do we glue first or do we coat first. Can someone please tell us if the bond between silicone glue and conformal coating is as strong as between silicone glue and PCB uncoated surface. We are concerned that heavy components, such as the large caps on some of our boards, would not be well supported if bonding is done after conformal coating. We have our own bias but we wanted to hear an outside opinion and/or see a standard on the topic. The adhesive and coating we use are listed below. 3-1744 (DOW), SILICONE ADHESIVE - for staking big components KE3421 (SHIN-ETSU), SLCN BRD COAT - conformal board coating Thanks Tim McQuay Training Coordinator Vansco Electronics Fax: 204-474-1674 e-mail: [log in to unmask] --------------------------------------------------------------------------------- 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 the archives of previous posts at: http://listserv.ipc.org/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 ---------------------------------------------------------------------------------