i-SAC 387 contains cobalt for improved melting, shiny solder joints, fine grain microstructure. Also contains germanium as an antioxidant. Has a melting point of 217°C and a specific gravity of 7.5 g/cm3.
i-SAC105 has silver composition of 0.5-1.5%, and contains cobalt for bright, shiny solder joints and fine grain microstructure, and germanium. Has a melting point of 217° to 227°C and a specific gravity of 7.4 g/cm3.