15/08/97 17:42 RE>>[TECHNET] Solder mask material Just to clarify my situation below. Ideally we should use SMOBC on these boards an did previously however ..... The board is specified to be SMOBC and HASL finish, however the manufacturer of the PCB has told us that it cannot be reliably produced using this method as the board is 4mm thick and has a considerable thermal mass, the result is a very high probability of cracked barrels in the PTH. They have suggested to try all over tin/lead reflow, but I am having no success as indicated by the problems described below. Any further suggestions would be appreciated. ------------------------------