CompoundList

Fulminic acid

Also known as formonitrile oxide, formonitrile-N-oxide, hydrido(nitrosyl-kappaN)carbon, hydrido(oxidonitrato-N)carbon, formonitrile oxide, Knallsaeure

CAS 506-85-4Formula CHNOMolar mass 43.03 g/mol
Fulminic acid chemical structure, CHNO, CAS 506-85-4
2D chemical structure

Key facts

What buyers check first

CAS number
506-85-4
Formula
CHNO
Molar mass
43.03 g/mol
HS code
281112
Category
Inorganic acids

What is Fulminic acid?

Plain description, key identifiers and synonyms

Fulminic acid is a nitrile oxide resulting from the oxidation of hydrogen cyanide. It is a hydracid, a nitrile oxide and a one-carbon compound. It is a conjugate acid of a fulminate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
formonitrile oxide
CAS number
506-85-4
Molecular formula
CHNO
InChIKey
UXKUODQYLDZXDL-UHFFFAOYSA-N
InChI
InChI=1S/CHNO/c1-2-3/h1H
SMILES (canonical and isomeric)
C#[N+][O-]

Synonyms

  • formonitrile oxide, formonitrile-N-oxide, hydrido(nitrosyl-kappaN)carbon, hydrido(oxidonitrato-N)carbon
  • formonitrile oxide
  • Knallsaeure
  • HCNO
  • Cynooxide anion
  • Hydrogen cyanide N-oxide
  • formonitrile-N-oxide
  • H-C#NO
  • (methylidyneammoniumyl)oxidanide
  • [C(H)NO]
  • [CH(NO)]
  • methylidyne(oxo)-lambda(5)-azane
  • hydrido(oxidonitrato-N)carbon
  • hydrido(nitrosyl-kappaN)carbon
  • Methylidyne(oxo)-lambda~5~-azane
  • formonitrile oxideformonitrile-N-oxidehydrido(nitrosyl-kappaN)carbonhydrido(oxidonitrato-N)carbon

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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)
0.45calc.
Topological polar surface area
27.42 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
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.

Fulminic acid suppliers

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

No supplier listings yet

Post one free request and suppliers who make or trade Fulminic acid can send you quotes. Your contact details stay private until you accept a quote.

Fulminic acid price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

Get latest price

Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

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 Fulminic acid is traded under.

HS 2811.12Indicative HS code

Hydrogen cyanide (hydrocyanic acid)

World exports in 2024
$396K
+2.5% vs 2023, imports $719K
2019 to 2024
Top exporters
  1. United States63.8%
  2. Czech Republic21.1%
  3. South Africa8.9%
Top importers
  1. Germany62.5%
  2. Suriname * partner reported9.8%
  3. DR Congo * partner reported4.8%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Fulminic acid?

Fulminic acid is a nitrile oxide resulting from the oxidation of hydrogen cyanide. It is a hydracid, a nitrile oxide and a one-carbon compound. It is a conjugate acid of a fulminate.

What is the CAS number of Fulminic acid?

The CAS registry number of Fulminic acid is 506-85-4.

What is the molecular formula and weight of Fulminic acid?

The molecular formula of Fulminic acid is CHNO and its molar mass is 43.03 g/mol.

Is Fulminic acid hazardous?

No GHS hazard classification for Fulminic acid is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Fulminic acid?

Fulminic acid is usually classified under HS code 281112 (Hydrogen cyanide (hydrocyanic acid)). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Fulminic acid?

Post a free request on CompoundList and suppliers of Fulminic acid will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Fulminic acid?

Suppliers quote Fulminic acid on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

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

Get quotes for Fulminic acid

Post one free request with your grade, quantity and destination. Matching suppliers send quotes you can compare side by side.
Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
Embed this structure on your websiteShow code

Paste this code into your page to show the 2D structure of Fulminic acid with a 3D view, its CAS number where known and a link back to this page. Free to use with the link kept.

<iframe src="https://www.compoundlist.com/embed/structure/fulminic-acid-506-85-4" title="Fulminic acid structure on CompoundList" width="360" height="420" style="border:1px solid #E7E2DA;border-radius:12px;max-width:100%" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>
Preview the embed

Explore more in Inorganic acids or HS code 281112

Price on request
Free quotes, contact stays private
Get quotes