Hi Vincent, We used to wavesolder 3.2mm 18"x12" boards at my previous contract manufacturing employer. The high thermal absorption of groundplane layers makes life interesting... I ensured a good immersion depth in the wave (almost 100% of pcb thickness), and a long,slow, thorough preheat prior to that. We were using no-clean flux, but no nitrogen. We achieved 50-75% fill in some areas of the board, 100% in others. I also had the pcb redesigned with a marginally larger hole to lead ratio, and wider vias on the next board revision which further improved matters. Regards, Justin Braime Process Engineer - Compuspec Industries 1a Niall Burgess Rd, Mt Wellington Auckland, New Zealand [log in to unmask] www.compuspec.com Ph: +64-9-574 1990 Fax: +64-9-574 1988 ----- Original Message ----- From: Vincent BADA To: [log in to unmask] Sent: Thursday, September 30, 1999 6:32 PM Subject: [TN] Wave soldering Hi all, What is the minimum vertical fill of solder for plated through holes ? We have some problems to obtain the 75% requested by IPC-A-610 for a class 2 board. In fact, the board has a thickness of 3,2 mm. We use a no-clean flux and the wave is under nitrogen. Is there any special criteria regarding to the thickness of the board ? Has anyone succeeded in obtaining a correct solder filet for thick boards ? Thanks, Vincent Bada Process Engineer Alcatel Etca Charleroi Belgium ############################################################## 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 Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################