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Hydrogen Chloride HCl
CAS No.: 7647-01-0
EINECS No.: 231-595-7
UN No.: UN1050
Purity: 99.9%, 99.999%
Dot Class: 2.3
Grade Standard: Electronic Grade, Refrigerant Grade
Most hydrogen chloride is used in the production of hydrochloric acid. It is also an important reagent in other industrial chemical transformations.
In the semiconductor industry, it is used to both etch semiconductor crystals and to purify silicon via trichlorosilane SiHCl3 .
In the laboratory, anhydrous forms of the gas are particularly useful for generating chloride-based Lewis acids, which must be absolutely dry for their Lewis sites to function.