Boron Trichloride (BCI3) Boron trichloride (BCl3) is a colorless, toxic, corrosive gas shipped as a liquid under its own vapor pressure. Northern Illinois customers who want a well-established, local producer of boron trichloride should contact Weldstar Specialty Gases at 708-627-1007.Boron trichloride has a number of traditional utilizations, 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 eliminate 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 used before in the creation of electrical resistors, to help create a carbon film over a ceramic base. Right now, most Ultra High Purity Boron Trichloride (BCl3) is utilized 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 provided to many chemical research facilities and universities for use as a reagent in the development of organic chemicals.