Boron Trichloride (BCI3) Boron trichloride (BCl3) is a colorless, toxic, corrosive gas produced as a liquid under its own vapor pressure. Denver customers who want a reputable, local producer of boron trichloride should get in touch with Rocky Mountain Air Solutions at (303) 777-6671.Boron trichloride has a variety of traditional uses, including as a starting material for the production of elemental boron. It has been historically connected with the preparation and refining of aluminium, magnesium, zinc, and copper alloys to remove nitrides, carbides, and oxides from molten metal, although most of these processes have moved away from North America.It still has 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 creation of electrical resistors, to help create a carbon film over a ceramic base. Currently, most Ultra High Purity Boron Trichloride (BCl3) is applied 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.