SODIUM HYDROGEN SULFITE (Sodium bisulfite) E222, L

Parameter	Attribute
Sodium bisulfite	E222, sodium bisulphite, sodium hydrogen sulfite
Formula	NaHSO3
Structure
IUPAC	Sodium hydrogen sulfite
INCI	SODIUM BISULFITE
CAS	7631-90-5
Molar mass	104.061 g/mol
Density	1.48 g/cm3
Solubility	42 g/100 mL

Sodium bisulfite (or sodium bisulfite, sodium hydrogen sulfite) is a chemical compound with the approximate chemical formula NaHSO₃. Sodium bisulfite is not actually a true compound, but a mixture of salts which dissolve in water to form solutions consisting of sodium and bisulfite ions.

In cosmetics, sodium bisulfite acts as a reducing agent and, in addition, as a hair removal/straightening agent including hair conditioners, moisturizers and hair dyes.

• Main functions in cosmetic products:
• Antioxidant: Inhibits reactions promoted by oxygen, preventing oxidation and rancidity.
• Curling or straightening agent: Modifies the chemical structure of the hair to shape it into the desired style.
• Preservative: Inhibits the development of micro-organisms in cosmetic products.
• Reducer: Modifies the chemical nature of another substance by adding hydrogen or removing oxygen

Sodium hydrosulfite is used as an antioxidant and as a reducing agent to keep products stable, colorless and odorless. The reducing properties also allow the control of the thickness of products. The maximum concentration in ready-to-use cosmetic preparations is 0,2 % (as free SO₂).

In the food industry, sodium bisulfite is used as preservative E222. It is found in dried fruit and nuts, canned fruit, prepared horseradish, potato products, baking powder, sausage, sweets, oil, beer, wine, soft drinks, vinegar. The maximum concentration in ready-to-eat food products is 0,2 % (as free SO2). Recommended daily intake: up to 0,7 mg/kg body weight.

In the cleaning industry - sodium bisulfite is used in the home as a bleaching agent for bleached laundry, as a dye remover when laundry has been inadvertently stained with a colored object, in a high temperature washing cycle. Typical use is about 5 grams per wash. It is found as an ingredient in detergents or bleaching agents.

In water improvement, sodium bisulfite is used as a de-oxygenating agent to purify water supplied to steam boilers to prevent corrosion problems. It is also found in water treatment products for clarification and softening filters. As sodium bisulfite is a strong reducing agent, it reduces oxidized iron (rust and brown scale) to an ionic state (making it soluble in water) during the washing cycle, thus removing both the filter charges and the cationic and anionic resins present in the softening filters. Often found in IRONOUT type cleaners in liquid form.

In the textile industry, an antichlorine is a substance used to break down the hypochlorite or chlorine remaining after chlorine bleaching in order to prevent ongoing reactions with the bleached material and damage to it. Sodium bisulfite is an example of an antichlorine. Antichlorines are very useful in the textile industry as chlorine bleaching of compounds is common practice. The binding of free chlorine renders waste water safe without further exposure to active chlorine. The treated water is no longer damaging to fabrics and does not harm bacterial cultures in water treatment plants.

In the photographic industry, sodium hydrosulfite is used to protect developer solutions from oxidation and to flush the fixative (sodium thiosulphate) out of film and photographic paper emulsions.

In metalworking, sodium bisulfite is used to remove silver, copper and iron oxides from antique and historical finds. Due to its reducing properties, sodium bisulfite converts insoluble metal oxides into soluble ones, and at the same time, due to the alkaline medium and the binding of oxygen, it acts as a corrosion inhibitor which prevents the metals from re-corroding into oxides.

In fisheries, sodium hydrosulfite is used to regulate fish activity.

In the chemical industry, sodium hydrosulfite is also used to purify laboratory reagents. It is used in chemical production as a sulfonation and sulfomethylation agent.

Important: Add the item to your basket, fill in the recipient's details and confirm your order. Thank you!

To save your precious time, we will deliver your order to your address at a time convenient for You!

*- Pictures of the goods may not reflect the actual appearance, color, assembly or shape of the goods and their packaging. The information in the product description is general and may not correspond to the information on the packaging of the product and may not be accurate as to the use of the product. The information given on the stocks and prices of goods may, in certain cases, differ from the actual prices and stocks of goods

**- The product complies with the requirements for food additive E222 but is not intended for use as a food additive.