Overview
Cyanuric acid is an organic compound belonging to the triazine family. First synthesized in the 19th century, it has become industrially significant due to its stabilizing properties, particularly in chlorinated water systems. The compound forms white crystals that are moderately soluble in water and exhibits weak acidic characteristics. In industrial contexts, cyanuric acid serves as a crucial intermediate in various chemical processes. Its molecular structure features alternating carbon and nitrogen atoms in a six-membered ring, which contributes to its stability and reactivity patterns. The compound is commercially available in powder or granular form, with purity levels typically ranging from 97% to 99% for most applications.
Physical and Chemical Properties
Cyanuric acid demonstrates notable thermal stability, decomposing rather than melting when heated to temperatures above 300°C. This property makes it valuable for high-temperature applications. The crystalline structure exhibits hydrogen bonding between molecules, accounting for its relatively high density compared to similar organic compounds. Chemically, cyanuric acid behaves as a weak acid with a pKa of approximately 6.88. It forms stable salts (cyanurates) with bases and participates in various substitution reactions typical of triazine compounds. The substance shows limited solubility in cold water (about 0.2 g/100 mL at 20°C) but becomes more soluble at higher temperatures, reaching approximately 3 g/100 mL at 100°C.
Main Applications
The largest application of cyanuric acid is in swimming pool water treatment, where it acts as a chlorine stabilizer. By forming a weak bond with free chlorine (hypochlorous acid), it protects the chlorine from rapid degradation by UV light while maintaining disinfecting properties. This application accounts for approximately 70% of global cyanuric acid consumption. In polymer chemistry, cyanuric acid serves as a crosslinking agent and flame retardant in certain plastics and resins. The agricultural sector utilizes derivatives as herbicides, while other industrial applications include metal cleaning formulations and disinfectant products. Recent research explores its potential in pharmaceutical intermediates and specialty chemicals.
Safety and Storage
While cyanuric acid is not classified as highly hazardous, proper handling procedures should be followed. The powder can generate dust that may irritate mucous membranes, requiring appropriate respiratory protection during large-scale handling. Skin contact should be minimized through the use of gloves and protective clothing. Storage recommendations include keeping containers tightly sealed in a dry environment away from strong bases and oxidizing agents. The chemical demonstrates good long-term stability when stored properly, with typical shelf life exceeding two years. Spills should be contained and cleaned with minimal water to prevent slippery surfaces, followed by proper disposal according to local regulations.
B2B Procurement Guide
Industrial buyers should specify required purity levels, which typically range from 97% to 99.5% depending on application. Technical grade (97-98%) suffices for most water treatment uses, while higher purity is necessary for pharmaceutical or food contact applications. Packaging options include 25kg bags, 500kg supersacks, or bulk shipments for large-scale consumers. Quality verification should include testing for moisture content (typically <0.5%), heavy metal content, and insolubles. Consider suppliers with ISO 9001 certification and those providing comprehensive safety data sheets. For international shipments, verify compliance with regional chemical regulations such as REACH in Europe or TSCA in the United States. Annual contracts with price adjustment clauses can help manage cost fluctuations in this commodity chemical market.
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