Cyanuric acid
CAS 108-80-5
EC 203-618-0
Formula C3H3N3O3
MW 129.07 g/mol
Heterocyclic Compounds Water TreatmentPlastics & PolymersTextile, Leather & Paper Flame RetardancyPreservation & Biocide
Description
Cyanuric acid (CAS 108-80-5, EC 203-618-0), also known as isocyanuric acid, tricyanic acid, and tricarbimide, is a triazine-based compound with the molecular formula C3H3N3O3. It carries no assigned E-code and is classified under HS code 29336980.
In water treatment, cyanuric acid acts as a chlorine stabiliser, forming chloroisocyanurate complexes that slow UV-induced chlorine degradation and extend disinfection efficacy. In plastics and polymer systems, it functions as a flame retardant by releasing non-combustible gases during thermal decomposition, interrupting the combustion cycle. It also serves as a biocidal active in textile and leather processing.
Cyanuric acid is supplied as a crystalline powder or in lump form and is subject to REACH registration requirements for EU importers and downstream users. Procurement teams should confirm supplier SDS documentation and purity grade specifications, as technical and high-purity grades are available depending on end-use requirements.
In water treatment, cyanuric acid acts as a chlorine stabiliser, forming chloroisocyanurate complexes that slow UV-induced chlorine degradation and extend disinfection efficacy. In plastics and polymer systems, it functions as a flame retardant by releasing non-combustible gases during thermal decomposition, interrupting the combustion cycle. It also serves as a biocidal active in textile and leather processing.
Cyanuric acid is supplied as a crystalline powder or in lump form and is subject to REACH registration requirements for EU importers and downstream users. Procurement teams should confirm supplier SDS documentation and purity grade specifications, as technical and high-purity grades are available depending on end-use requirements.
Physical Properties
| Melting Point | 360 °C |
| Boiling Point | 190 °C |
| Density | 2.500 g/cm³ @ Temp: 20 °C |
| Appearance | white powder |
| Color | White to light beige |
| Odor | off-wh. cryst., odorless |
| Form | Crystalline Powder or Lumps |
| Water Solubility | 0.3 g/100mL (25 ºC) |
| Vapor Pressure | <0.0001 Pa (25 °C) |
| Refractive Index | 1.4500 (estimate) |
| pH | 3.8-4.0 (H2O, 20℃)(saturated solution) |
| Log P | -1.31 at 25℃ |
Safety & Handling (Learn More)
Warning GHS07
H
H319
P
P280P264+P265P337+P317P305+P351+P338
Trade & Regulatory
| HS Code | 29336980 |
| UN Number | 3389 |
| ADR Class | 6.1 |
| Packing Group | I |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 3 |
Other Names
1,3,5-triazinane-2,4,6-trioneIsocyanuric Acid1,3,5-triazinetriol1,3,5-triazine-2,4,6-triolTRICARBIMIDETricyanic acidCYANURIC FLUORIDE
Related Products
Raw Materials
Derivatives
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