Quality control of solder powders with the CAMSIZER XT - solder pastes are used in the electronics industry for reflow-soldering of SMD (surface mounted devices) components on printed circuit board (PCB) assemblies. The solder paste is printed on the contact pads and the components are mounted on these pads. The paste attaches the components on the PCB until the PCB is heated in an oven where the solder paste melts. The melt connects the electronic components (resistors, transistors, ICs, EPROMS, etc.) and the contact pads of the PCB providing the electric contact and mechanical fixture after cooling and solidification. An essential component of solder paste, beside the flux, is the solder powder.