Hi Technet My company recently had a PWB assembled. It had about 75 SMT IC's some with 0.5mm lead pitch. The assembly house said they silk screened on flux only and allowed what solder was on the PWB pads and the leads themselves to effect the connection. Is this usual?? I thought that a slurry of flux and granulated solder particles was applied to the board prior to placement and heating. They used a hot air heating system and we had many cold solder joints especially in the PLCC sockets. In about two weeks we're having more boards assembled. I welcome advise on how/what to specify to the assembly house. Thanks in advance - Ray Klein [log in to unmask]