Dear Tecnetters " Hi " we have a PCB of 12 layers with thickness of 3.2mm. Problems we are facing are 1.Solder doesn't come top side and as the thickness is more than pre established components lead lengths ,like DIP's IC,connectors pins , it is mandatory for us that a fully wetted solder is visible from primary side. 2.Many of the components are on the ground plane , so if any rework is required we could not do so by soldering iron ( we tried weller 150 watts iron with temp. 450 deg. C , but we could not remove an electrolytic cap.) 3.What IPC tells about the power connector lead protrusion and the top side solder fill up for the same. As the IPC 610B states in components installation 3.5.3.1/note: that lead protrusion may not be visible in more than 2.3mm thick boards.How we interrelate it with soldering 4.1/vertical fill of soldering 75 % in this case. 4.We are using AC by pass connector "PICH47F400A1" with recommended PCB hole dia 2.1mm for lead dia 1.6mm , Is it enough for 3.2mm thick PCB too. Any body have the soldering experience of 3.2mm thickness PCB. what parameters ( wave height/ pre heater temp ) of wave soldering M/c matter in this case .Is chip wave is useful , Pls. share your exp. it will be highly appreciated. Thanks BR Pankaj Karnwal Jr. Engineer QA Barco Electronics System (P) Ltd. Plot no. A- 4 & 5, Sector- 5 G.B Nagar, Noida - 201301 India Tel .+91-120-2421651-660 Ext.211 Fax.+91-120-2421691 WWW.barco.com mailto:[log in to unmask] --------------------------------------------------- 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 847-509-9700 ext.5315 -----------------------------------------------------