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Inorganic acids

Cyanic acid

Also known as Zyansaeure, Cyansaeure, hydroxidonitridocarbon

CAS 420-05-3Formula CHNOMolar mass 43.03 g/molEC 609-981-5
1 supplier listed
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Cyanic acid chemical structure, CHNO, CAS 420-05-3
2D chemical structure

Key facts

What buyers check first

All properties
Melting point
-86 °C
Boiling point
23 °C
Density
1.140 @ 20 °C
HS code
281119
Category
Inorganic acids

What is Cyanic acid?

Plain description, key identifiers and synonyms

Cyanic acid is a pseudohalogen oxoacid and a one-carbon compound. It is a conjugate acid of a cyanate. It is a tautomer of an isocyanic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
cyanic acid
CAS number
420-05-3 CAS number cross-checkedOther or deprecated CAS: 71000-82-3
EC number
609-981-5
Molecular formula
CHNO
UNII
460E3FHT8O
InChIKey
XLJMAIOERFSOGZ-UHFFFAOYSA-N
InChI
InChI=1S/CHNO/c2-1-3/h3H
SMILES (canonical and isomeric)
C(#N)O

Synonyms

  • Zyansaeure
  • Cyansaeure
  • hydroxidonitridocarbon
  • nitridooxocarbonic acid
  • acide cyanique
  • acidum cyanicum
  • acido cianico
  • hydrogen nitridooxocarbonate
  • [C(N)OH]
  • (C(N)OH)
  • hydrogen nitridooxocarbonate, hydroxidonitridocarbon, nitridooxocarbonic acid
  • HOCN
  • cyanoalcohol
  • cyano alcohol
  • cyano-alcohol
  • HO-C.equiv.N

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Melting point
-86 °Cexp.
Boiling point
23 °Cexp.
Density
1.140 @ 20 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
43.03 g/molcalc.
Exact mass
43.0058 Dacalc.
LogP (octanol/water)
-0.16calc.
Topological polar surface area
44.02 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Cyanic acid suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

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  • EvitaChem
    China, BeijingUnclaimed profile
    Cyanic acidGrade, purity and minimum order on request
    Price on request
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Where suppliers are based

1 supplier in 1 country

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Cyanic acid price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Roles

  • animal metabolite
  • eukaryotic metabolite
  • human metabolite
  • mammalian metabolite
  • metabolite

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Cyanic acid is traded under.

HS 2811.19Indicative HS code

Inorganic acids, other than hydrogen fluoride

World exports in 2024
$494M
+6.5% vs 2023, imports $458M
2019 to 2024
Top exporters
  1. China24.9%
  2. Israel16.0%
  3. Jordan * partner reported11.7%
Top importers
  1. China29.3%
  2. United States16.2%
  3. Germany7.0%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Cyanic acid is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Cyanic acid, based on the data on this page

What is Cyanic acid?

Cyanic acid is a pseudohalogen oxoacid and a one-carbon compound. It is a conjugate acid of a cyanate. It is a tautomer of an isocyanic acid.

Guides for buyers

Practical guides that help when you source, ship or handle Cyanic acid

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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