Vis-a-vis the entire tonnage of the flux constituent, the lead free solder constituent and the resin entering

摘要

The flux composition for the lead free solder of this invention dehydroacetic abietic acid 8 - 65 weight %, is the composition which 8 - 67 weight % contains jihidoroabiechin vis-a-vis the entire quantity of the composition. As for this flux composition, when amount used of the activator is decreased, insulating resistance of the flux residue in regard to utility sufficiently is high, in addition, gets wet and spreads and characteristic satisfactory, namely it is something which can obtain the solder composition whose solderability is satisfactory. In addition, as for the flux composition for the lead free solder of this invention, after the soldering when it seals with various seal resin and the like, it is something which can obtain the solder composition which does not obstruct hardening the particular seal resin.