CPC B23K 35/3613 (2013.01) [B23K 35/362 (2013.01); B23K 35/365 (2013.01); B23K 35/368 (2013.01)] | 15 Claims |
1. A flux comprising:
a rosin methyl ester,
an unesterified rosin and,
an activator which includes an organic halogen compound activator,
wherein a content of the rosin methyl ester is 0.5% to 20% by mass with respect to a total mass of the flux,
wherein a content of the unesterified rosin is 73% to 98.9% by mass with respect to the total mass of the flux,
wherein the flux is solid at 25° C. or is solid-like having a viscosity η1 at 25° C. of 3,200 Pa·s or more when the viscosity is measured by the steps comprising:
sandwiching the flux between parallel flat plates of a rheometer and deforming by narrowing a space between the parallel flat plates while heating at 100° C.
thereby forming a thin sample of the flux having a thickness of 0.5 mm,
cooling the thin sample to 25° C.,
rotating the parallel flat plates of the rheometer at 6 Hz;
measuring the viscosity η1 at 25° C. 5 minutes after rotating parallel flat plates; and
wherein the flux is used for an inside of a flux-cored solder or an exterior of a flux-coated solder.
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