SN100C (551CT) Pb-free solder combines the benefits of SN100C alloy with a sustained activity cored flux. Is formulated for use with soldering tip temperatures up to 380°C, while still retaining sufficient activity to ensure good tip separation. Stable microstructure accommodates long-term cyclic strain and impact loading to which solder joints can be subjected in service. For sequential soldering and rework. 

Nihon Superior Co. Ltd., www.nihonsuperior.co.jp/english