Colleagues, Question: Is there any specific concern about solder wire due date IPC quality level 1? As per J-STD-001 3.2.2 (including J-STD-006) it is not specified any requirement for Level 1 about solder purity which could be affected from due date (oxides growing etc). Which is the main concern related on solder due date to be taken into account? Have been reading some papers beside the specific IPC stds mentioned upper, and all comments states something like this (or approach similar concepts): "The presence of additional oxidation may be visible on the surface of the wire. You may find that the oxidized surfaces are only on the outer portion of the cored wire, meaning that you could unspool the wire until you get down to the less oxidized material. You can determine if the expired cored wire is still usable by simply trying it – and if you aren't getting the typical amount of soldering action (wetting speed, spread) that you normally expect, this means that the age of the cored wire could cause a performance issue. I have never heard of a reliability issue related to using cored wire past the expiration date of the cored wire. The caveat to that statement is that if the solder is excessively oxidized, the operator may feel forced to supplement the cored wire with more liquid flux than would be considered typical or acceptable." Keep awaiting for your comments. brgds,Ricardo ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________