Solder wires are available in various alloys, diameters and with a wide variety of flux fillings. The following factors must be considered for the selection of the suitable solder wire:
the flux classification (ROL0, ROM1, etc.), the metallic alloy (SAC305, SAC0307, etc.), the solder wire diameter (1.0mm, 0.75mm, etc.)
and the flux percentage (3.5%, 2.2%, etc.).