What is the solder mix - 60/40, 63/37? ______________________________ Reply Separator _________________________________ Subject: RE:ASSY: Author: [log in to unmask] at internet-mail Date: 5/14/96 9:36 AM Dear Technet, Whenever, I'm running a 100% through-hole board, that is densely populated with mainly DIP components, and a only few capacitors and resistors., 20 to 30% of the solder joints are gritty. It had never happened to board of mixed technology. I have sent the solder for lab. analysis, and the result is within the recommended specification. The Board is :- 10 x 10 sq.inch 4 layers The wave-solder Machine used :- The wave-solder machine used is SEHO 2000 - a full-blown nitrogenous tunnel. The solder pot temperature is set at 245 deg.cel or 473 deg.F. The top side temperature is measured at about 194 deg.F / 90 deg.C. Conveyor speed is set 0.90 metre/minute. The solid content of the flux is 1%. Could anybody advise me why this is happening, and how to solve it. Our rework operators are touching every gritty joint. Poh Kong Hui Nera Electronics