Many assemblers are doing both leaded and lead-free soldering in the same location, what needs to be done to avoid cross-contamination? This question comes up more often during an audit where an assembler has just transitioned. Lead can create havoc in a lead-free wave operation. Lead-free bar comes in at lead levels < 0.05% while the RoHS limit is 0.1%. The unintentional addition of two 1 lb bars of Sn63Pb37 can elevate the Lead level beyond the RoHS limit. There is no practical way to remove lead in a wave pot so pot dumping or extensive dilution will be required. More