| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux and solder paste having high preservable stability as well as a soldering method and solder which deal with finer pitches and diversification of parts and have high reliability. SOLUTION: Specific ascorbic acid derivatives, specific tocopherol derivatives and lecithin are added as reducing agents into the flux. The particles below 20μm in the solder powder is confined to <=30% in number distribution, the oxygen content therein to <=500 ppm and the moisture content in the solder paste to <=0.5 wt.%.
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