Properties of Sodium Dichloroisocyanurate


NameSodium dichloroisocyanurate; Euchlorin
Molecular formula(C3Cl2N3O3)Na
CAS No2893-78-9
Relative molecular mass219.95 (according to 2001 International Relative Atomic Mass)

Product Features

Dichloroisocyanuric acid is a highly effective, broad-spectrum, new type of internal absorption fungicide with strong biocidal effect, and the bactericidal rate reaches 99% at 20ppm. It can kill all kinds of bacteria, algae, fungi and germs. Sodium dichloroisocyanurate is chemically stable, and the effective chlorine decreases no more than 1% within half a year when stored under dry conditions, which is convenient for storage and transportation; it is safe, easy to use, with low dosage and long duration of efficacy.

The action mechanism of sodium dichloroisocyanurate is as follows: spraying on the crop surface can slowly release hypochlorous acid, which will cause the pathogenic bacteria to die rapidly by denaturing the fungal protein, changing the membrane permeability, interfering with the physiological and biochemical enzyme system and influencing the DNA synthesis and other processes.


White powder or granule, with chlorine odor, easily soluble in water, the effective chlorine will decrease little in long-term storage of dry products.

Main technical index

Indicator nameQuality productFirst-class product
Effective Chlorine Content%≥60.056.0
Water Content %≤ 3.07.0
PH value of 1% solution5.5-7.0

Common Uses

Wool anti-shrinkage treatment

Sodium dichloroisocyanurate aqueous solution can evenly release hypochlorous acid, which interacts with the protein molecules in the wool scale layer, breaking some of the bonds in the wool protein molecules, thus preventing shrinkage. In addition, the use of sodium dichloroisocyanurate solution to treat wool products can also prevent the occurrence of adhesion, or “pilling,” when wool is washed.

The shrinkage of the treated wool is almost invisible, and the color is bright and feels good; the use of 2% to 3% sodium dichloroisocyanurate solution and the addition of other additives to wool or wool-blend fibers and fabrics can be impregnated, so that wool and its products do not pilling, not felt shrinkage. Typical formulations are: (1) 0.5 parts of sodium dichloroisocyanurate (mass, same below), 0.15 parts of acetic acid, 0.02 parts of wetting agent, 600 parts of water, 200 parts of wool fabric, soaking time of 0.5h at room temperature; (2) 0.5 parts of sodium dichloroisocyanurate, 0.15 parts of peroxyacetic acid, 0.02 parts of wetting agent, 600 parts of water, 200 parts of wool fabric.

Textile Industry Bleaching

In the textile industry, sodium dichloroisocyanurate is mainly used as a bleaching agent for natural and synthetic fibers. The bleaching of natural and synthetic fibers destroys the pigments contained in the fibers. Sodium dichloroisocyanurate can produce hypochlorous acid in water. Hypochlorous acid can react with the conjugate bonds of color-emitting groups in fibers to change the wavelength of light absorption of fibers and destroy the pigment in fibers, thus achieving the purpose of bleaching.

Compared with the traditional bleaching agent, sodium dichloroisocyanurate has many unique advantages, such as the general bleaching agent requires the use of high temperature, and high temperature will intensify the erosion of bleaching agent on the fiber and reduce the strength of the fiber, while sodium dichloroisocyanurate can still achieve good bleaching effect even at a lower temperature; In addition, the use of sodium dichloroisocyanurate to bleach natural fibers and synthetic fibers, not only can the bleaching agent be used at a higher temperature, but also can reduce the strength of the fiber. The bleaching effect is good, and the fiber erosion is small, but also can improve the tensile strength and elongation of the fiber, for cotton fabrics, there is the removal of cotton pulp, improve hydrophilicity and prevent cellulose degradation and so on.

Sterilization and Disinfection for Farming

Sodium dichloroisocyanurate is a good disinfectant for silkworm rooms, silkworm tools and silkworm bodies, such as sodium dichloroisocyanurate or sodium dichloroisocyanurate as the main body, adding stabilizers and accelerators evenly mixed from the disinfectant solution can be sprayed or smoked to disinfect silkworm rooms, silkworm tools and silkworm bodies, and can prevent and control silkworm diseases.

Not only for the domestic silkworm virus, fungal, bacterial and protozoan pathogens have a good killing effect, but also for the gastrointestinal abscess polyps, gastrointestinal abscess virus, blood-type thick disease polyps and other significant killing effect, compared with the current common disinfectants for silkworm, its dissolution speed, good stability, long efficacy period, no adverse effects on the growth and development of the silkworm and silkworm quality, is the current development of the disinfectants for silkworm. One of the best disinfectants for silkworm farming.

Sterilization and Disinfection of Aquaculture

Sodium dichloroisocyanurate can effectively prevent and control fish diseases caused by bacteria, fungi and algae, as well as viral diseases of fish.
Detergent Additive

Sodium dichloroisocyanurate can be used as an additive in household dry bleach, bleaching detergent powder, scouring powder, dishwashing liquid and other detergents to bleach, sterilize and increase the function of detergents, especially for the cleaning of protein and fruit juice.

Civilian hygiene disinfection

When disinfecting dishes, add 400~800mg of sodium dichloroisocyanurate per 1L of water, soaking for 2min can kill all the E. coli, the killing rate of bacillus can reach more than 98% for more than 8min, and the surface antigen of hepatitis B virus can be completely killed for 15min. In addition, sodium dichloroisocyanurate can also be used for disinfecting the appearance of fruits and poultry eggs, deodorizing refrigerator sterilizer and disinfecting and deodorizing the bathroom.

Disinfection of swimming pool water

Swimming pool water without disinfection, germs can easily breed, the pool wall with a layer of sticky and dirty microbial algae, pool water emits an unpleasant odor, swimmers exposed to slimy algae will be annoyed, the pollution of the pool water will also make swimmers infected, light skin infection, heavy eyes, respiratory organs infected, if you add sodium dichloroisocyanurate in the pool water, not only the water color blue, clear and shiny, smooth walls, no adhesions, swimmers feel comfortable, but also in the use of concentrations harmless to the human body, sterilization efficiency, to protect people’s health is very beneficial.

Drinking Water Disinfection

Sodium dichloroisocyanurate, used in drinking water, can effectively kill various algae organisms and destroy the color and odor of hydrogen sulfide and other pollutants in the water. At a concentration of 2×106, it can kill 100% of Escherichia coli, osteitis virus, dysentery and hepatitis viruses.

Industrial Recycled Water Treatment

Many industrial sectors (such as coal-fired power plants, petroleum refineries, chemical plants, etc.) require large amounts of cooling water to remove the heat generated during the process, and many equipment such as heat exchangers, condensers, circulation pipes, cooling towers, and pump systems produce large amounts of fouling due to the rapid growth of algae. One of the most effective ways to treat cooling water is to use a biocide, of which sodium dichloroisocyanurate is an important one.

Sodium dichloroisocyanurate is used in industrial circulating water treatment systems, as an important part of industrial cooling water tower water treatment agent, can effectively prevent the growth of algae microorganisms, industrial equipment does not corrode, can maintain the water quality in the circulating water system for a long time.

Food industry, cleaning and disinfection of public places

Sodium dichloroisocyanurate is becoming more and more widely used in the field of cleaning and disinfection in food processing plants, dairy processing plants, breweries, and soft drink plants. Not only the equipment (tanks, pipes, containers, utensils, tools, utensils, sites) in the production and processing process should be cleaned and disinfected, but also the utensils (trays, plates, bowls, tablecloths, hand towels, etc.) in cafes, cold drink stores, teahouses, restaurants, cafeterias often need to be cleaned and disinfected with sodium dichloroisocyanurate in order to prevent the spread of diseases, eliminate protein-induced spots, mildew, and other diseases. Odor, etc., to achieve the effect of maintaining the luster of utensils.

Preparation or Source

Produced by the reaction of cyanuric acid, chlorine, etc.

Safety requirements

  • Sodium dichloroisocyanurate is a strong oxidizer. Contact with flammable materials may cause a fire.
  • Sodium dichloroisocyanurate is a corrosive product with irritating odor and may cause burns to eyes, cat membranes and skin. It is forbidden to contact with human body. In case of inadvertent contact, flush with plenty of water immediately and send to hospital for treatment if serious.
  • Operators should wear protective glasses, rubber gloves and other labor protective equipment.

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