Most electronic manufacturing facilities use some type of soldering operation to form a conductive connection between electronic components and a circuit board. These operations often involve equipment described as wave soldering, hydrosquegees, solder levelers, solder reflow, solder coating, drag soldering, solder plating, and/or hand soldering. Soldering materials usually consist of a conductive metal (solder) and an organic liquid (flux). Emissions of metal fumes are assumed to be negligible since typical soldering temperatures are well below the boiling point of the metal. The solder process does, however, result in the evaporation of some volatile organics in the flux.