Trichloroisocyanuric acid

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Trichloroisocyanuric acid
Trichloroisocyanuric-acid-3D-balls.png Symclosene
CAS number 87-90-1 YesY
PubChem 6909
ChemSpider 6643 YesY
ChEBI CHEBI:33015 YesY
RTECS number XZ1925000
Jmol-3D images Image 1
Molecular formula C3Cl3N3O3
Molar mass 232.41 g mol−1
Appearance Colorless solid
Density 2.19 ± 0.1 g/cm³
Melting point 246 to 247 °C (475 to 477 °F; 519 to 520 K)
Boiling point decomp.
Solubility in water 0.2%
Solubility in other solvents Soluble in chlorocarbons, acetone, and acetonitrile
Dipole moment 0 D
R-phrases R8, R22, R31, R36/37, R50/53
S-phrases S8, S26, S41, S60, S61
Main hazards lung irritant
Flash point NA
Related compounds
Related compounds Cyanuric chloride
Dichloroisocyanuric acid
Tribromoisocyanuric acid
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Trichloroisocyanuric acid is an organic compound with the formula (C3Cl3N3O3). It is used as an industrial disinfectant, bleaching agent and a reagent in organic synthesis.[1][2] This white crystalline powder, which has a strong "chlorine odour," is sometimes sold in tablet or granule form for domestic and industrial use.


The compound is a disinfectant, algicide and bactericide mainly for swimming pools and dyestuffs, and is also used as a bleaching agent in the textile industries. It is widely used in civil sanitation, pools and spas, preventing and curing diseases in husbandry and fisheries, fruits and vegetables preservation, wastewater treatment, algicide for recycling water of industry and air conditioning, anti shrink treatment for woolen, treating seeds, bleaching fabrics, and organic synthesis.

Trichloroisocyanuric acid in swimming pools is easier to handle than chlorine. It dissolves slowly in water, but as it reacts, cyanuric acid concentration in the pool will build-up. At high cyanuric acid concentrations, normal chlorine levels can be rendered ineffective, requiring either dilution by draining and refilling the pool or by adding abnormally high doses of chlorine to overcome this effect.

See also[edit]


  1. ^ Hiegel, G. A. (2001). "Trichloroisocyanuric Acid". Encyclopedia of Reagents for Organic Synthesis. New York: John Wiley & Sons. doi:10.1002/047084289X.rt209. 
  2. ^ Barros, J. C. (2005). "Trichloroisocyanuric acid". Synlett 2005 (13): 2115–2116. doi:10.1055/s-2005-872237. 

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