| 摘要 |
PROBLEM TO BE SOLVED: To provide a soldering flux, solder paste and wire solder which are excellent in solderability as well as joined assemblies of circuit boards and electronic parts dealing with fine pitching and the diversification of parts. SOLUTION: Rosin having an acid value ranging from 150 to 250 and a softening point ranging from 120 to 200 deg.C is added to the flux.
|
