still for sammanlodning of metals with extremely hard materials, foretredesvis synthetic materials, and lodemedel for implementation of

摘要

1515135 Soldering fluxes INST PROBLEM MATERIAL AKAD NAUK UKRAIN SSR TOMILIN ZAVOD ALMAZ and VSES N I INST ABRAZ I SHLIF 4 Aug 1975 [2 Aug 1974(2)] 32442/75 Heading C7M [Also in Division B3] Fluxes for soldering comprise (a) 35% boric anhydride, 42% anhydrous potassium fluoride, 23% potassium fluoborate; (b) 70% boric acid, 9% calcium fluoride, 21% sodium tetraborate; (c) 20% boric acid, 80% sodium tetraborate; (d) 10% sodium chloride, 8% zinc chloride, 32% lithium chloride, 50% potassium chloride.