PROBLEM TO BE SOLVED: To achieve desirable flux characteristics without presence of boric acid (H3BO3) or borax (NaB4O5(OH)4H2O) in flux.;SOLUTION: The invention described herein pertains generally to a boric acid free flux composition in which boric acid and/or borax is substituted with a molar equivalent amount of potassium tetraborate tetrahydrate. In some embodiments, a phthalocyanine pigment is used to effect color change at an activation temperature.;SELECTED DRAWING: None;COPYRIGHT: (C)2019,JPO&INPIT
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机译：要解决的问题：在没有硼酸存在的情况下达到期望的助焊剂特性（H 3 Bo 3 ）或硼砂（nab 4 o （OH） 4 h 2 o）。;溶液：本文所述的发明通常涉及到其中硼酸的无硼酸无助焊剂组合物酸和/或硼砂被摩尔当量的四元四水合物的摩尔当量量取代。在一些实施方案中，使用酞菁颜料在激活温度下实现颜色变化。;选定的绘图：无;版权：（c）2019，JPO和INPIT
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