fluxing agent熔剂，焊剂，焊药，助熔剂。
flux vt.使熔化；使泻；涨。vi. 熔化。 动词形态fluxing有“稀释，冲淡”的意思

【例句】
If fluxed parts are allowed to stand, the water in the flux will evaporate.
如果容许焊剂部件出于竖立状态, 则焊剂内的水分将会蒸发掉。

After several tests, applicable analytical requirements related to fluxing agent, sample weighing and analysis time after burning were selected, the result was satisfied.
经试验，选择了助熔剂、称样量、燃烧分析时间等适应的分析条件，结果令人满意。