The older military and aviation boards we make still all use lead. Changing to lead-free requires an extensive re-certification process for each board, and no one at any level wants to do that. Which seems to create a belief that lead is manageable and okay. Interestingly, the board assembly shop still prefers lead because the boards are apparently easier to make.
Rosin-core is popular because it's a 1-step process. No need to put on the liquid, which seems to make at least the same mess.
Rosin-core is popular because it's a 1-step process. No need to put on the liquid, which seems to make at least the same mess.
[edit:grammar]