Calcium hypochlorite

Calcium hypochlorite (CAS 7778-54-3) is an inorganic chlorine-releasing compound commercially known under trade names including HTH, Caporit, Losantin, and B-K Powder. It carries no E-code designation and is registered under EC number 231-908-7. It is classified as an oxidizing salt and listed under HS code 28281000.

In water treatment, calcium hypochlorite disinfects municipal and recreational water by releasing hypochlorous acid upon dissolution, which disrupts microbial cell membranes at low concentrations. In textile and paper processing, it bleaches cellulose-based substrates through oxidative degradation of chromophoric bonds. Food contact surface sanitation relies on its rapid bactericidal action against pathogens including Listeria and E. coli.

Calcium hypochlorite is available in powder, granule, and tablet form at active chlorine concentrations typically ranging from 65% to 70%. It is subject to REACH registration and handled under relevant biocidal product regulations in the EU. Packaging formats include HDPE drums and fiber drums suited for bulk procurement.