Boron Trichloride (BCI3) Boron trichloride (BCl3) is a corrosive gas that is colorless and toxic and is delivered as a liquid under its own vapor pressure. St. Louis customers who want a reputable, local producer of boron trichloride should get in touch with Cee Kay Supply, Inc. at 314.644.3500.Boron trichloride has a variety of classic uses, including as a starting material for the manufacture of elemental boron. It has been normally connected with the preparation and refining of aluminium, magnesium, zinc, and copper alloys to get rid of nitrides, carbides, and oxides from molten metal, although the majority of these processes have moved away from North America.It still experiences some use when mixed with other compounds as a soldering flux for alloys of aluminium, iron, zinc, tungsten, and monel. Most BCl3 in North America was previously used in the production of electrical resistors, to help create a carbon film over a ceramic base. At this time, most Ultra High Purity Boron Trichloride (BCl3) is used in plasma etching in semiconductor manufacturing. This gas etches metal oxides by formation of boron chlorates.Cylinder quantities of PurityPlus® High Purity Boron Trichloride are also distributed to many chemical research facilities and universities for use as a reagent in the synthesis of organic chemicals.