Synchem International Co., Ltd.

98.5% Cyanuric acid

98.5% Cyanuric acid
Product Detailed

98.5% Cyanuric acid
1 Appearance:white powder
2 Assay: 98.5% min
3 PH(1% solution):4.0-4.5
4 Residue of ignition(Ash) %:0.1M

98.5% Cyanuric acid


Formula C3N3H3O3



CAS 108-80-5


Technical index

   Content  more than 98.5%

   PH(1% solution)  4.2


Dosageform: powder,granular or tablet


Applications:for production of chlorois ocyanurates, paints and coatings;as the raw material for the prodution of bactericides, disinfectants, bleaches or selective weed killers


Package and weight( net weight):

plastic barrel: 25kg, 50kg

cardboard barrel: 25kg, 50kg

plastic knitting bag;25kg, 1000kg

( or decided by customer)



Cyanuric acid or 1,3,5-triazine-2,4,6-triol is a with the (CNOH)3. Like many industrially useful chemicals, this has many synonyms. This white, odorless solid finds use as a precursor or a component of , disinfectants, and herbicides. In 1997, worldwide production was 160 million kilograms.

Properties and synthesisProperties

Cyanuric acid is the cyclic of the elusive species cyanic acid, HOCN. The two shown in the infobox readily interconvert; that is, they are . The triol tautomer, which may have aromatic character, predominates in solution. The (-OH) groups assume character. Deprotonation with base affords a series of cyanurate :

[C(O)NH]3  [C(O)NH]2[C(O)N]- + H+ (Ka = 10−7) [C(O)NH]2[C(O)N]-  [C(O)NH][C(O)N]22- + H+ (Ka = 10−11) [C(O)NH][C(O)N]22-  [C(O)N]33- + H+ (Ka = 10−14) Synthesis

Cyanuric acid (CYA) was first synthesized by in 1829 by the thermal decomposition of and . The current industrial route to CYA entails the of urea, with release of ammonia. The conversion commences at approximately 175 °C:

3 H2N-CO-NH2 → [C(O)NH]3 + 3 NH3

CYA crystallizes from water as the dihydrate.

Cyanuric acid can be produced by hydrolysis of crude or waste followed by crystallization. Acid waste streams from plants producing these materials contain cyanuric acid and on occasion, dissolved amino-substituted triazines, namely, , ammelide, and melamine. In one method, an ammonium sulfate solution is heated to the "boil" and treated with a stoichiometric amount of melamine, by which means the cyanuric acid present precipitates as melamine-cyanuric acid complex. The various waste streams containing cyanuric acid and amino-substituted triazines may be combined for disposal and during upset conditions, undissolved cyanuric acid may be present in the waste streams.

ApplicationsPrecursors to chlorinated cyanurates

Cyanuric acid is mainly used as a precursor to N-chlorinated cyanurates, which are used to disinfect water. The dichloro derivative is prepared by direct chlorination:

[C(O)NH]3 + 2 Cl2 + 2 NaOH → [C(O)NCl]2[C(O)NH]

This species is typically converted to its sodium salt, sodium dichloro-s-triazinetrione. Further chlorination gives , [C(O)NCl]3. These N-chloro compounds serve as disinfectants and algicides for swimming pool water.

Precursors to crosslinking agents

Because of their trifunctionality, CYA is a precursor to crosslinking agents, especially for polyurethane resins.


Testing for cyanuric acid concentration is commonly done with a turbidometric test, which uses a reagent, melamine, to precipitate the cyanuric acid. The relative turbidity of the reacted sample quantifies the CYA concentration. Referenced in 1957. This test works because melamine combines with the cyanuric acid in the water to form a fine, insoluble, white precipitate that causes the water to cloud in proportion to the amount of cyanuric acid in it.


Animal feed

FDA permits a certain amount of cyanuric acid to be present in some (NPN) additives used in animal feed and drinking water. Cyanuric acid has been used as NPN.


Cyanuric acid is classified as "essentially nontoxic." The 50% oral median lethal dose () is 7700 mg/kg in rats.However, when cyanuric acid is administered together with (which by itself is another low-toxicity substance), they may form extremely insoluble crystals, leading to formation of kidney stones and potentially causing kidney failure and -- as evidenced in dogs and cats during the and in children during the cases.
















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