Birlasulf® SS sodium sulphite
Sodium sulphite is a white, odourless, soluble crystalline powder with a sulphur dioxide content of around 49.5 per cent by weight. The solution is alkaline in nature.

It is used in a wide variety of applications, some of which are as an antichlor in water-treatment and desalination plants, in the reduction of waste water in the chrome-plating industry, as a preservative in the manufacture of trinitrotoluene (TNT), as a bleaching agent in pulp mills, in leather treatment, in power plants and pulp mills for scrubbing sulphur dioxide gas, as an oxygen scavenger in low-pressure boilers and in the manufacture of detergent, sodium thiosulphate and photographic chemicals.

Birlasulf® SM sodium metabisulphite
Sodium metabisulphite, also known as sodium pyrosulphite, is a white-to-yellowish, soluble crystalline powder with the odour of sulphur dioxide and is 65.5 per cent sulphur dioxide by weight. It is a strong reducing agent.

Some of its major applications are as a preservative in the starch and food industry, to control melanosis (black spot) in shrimp, for fermentation in the wine industry, as an antichlor in the chemical industry and as a redox catalyst in the acrylic fibre industry. Sodium metabisulphite is also used as a reducing agent in the purification of aldehydes and ketones, for the manufacture of sulphonated oil and sulphonated resin, for the detoxification of cyanide in gold ore processing plants and in the manufacture of photographic chemicals.

Birlasol® 35 sodium bisulphite
Sodium bisulphite, also known as sodium hydrogen sulphite, is a clear, colourless-to-yellowish solution that is 34– 36 per cent sodium metabisulphite or approximately 23–24 per cent sulphur dioxide by weight. It has the odour of sulphur dioxide and is a strong reducing agent.