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Hydrogen cyanide

CAS 74-90-8 · 100/100 · High conf.

Also registered as 4 other CAS numbers

143334-20-7 · 191234-22-7 · 341972-31-4 · 2622237-35-6

Hydrogen cyanide chemical structure

Concern score

100/100Critical concern based on regulatory listings.
High confidence

Hydrogen cyanide in plain language

What it is

Also known as Hydrogen cyanide and its salts · Ac (chemical warfare agent) · Evercyn · Formic anammonide · Hydrocyanic acid · Prussic acid

Show all 28 names

formonitrile · Acide cyanhydrique · Acido cianidrico · Acido hidrocianico · Aero Liquid HCN · Agent AC · Blausaeure · Blauwzuur · Cyanwasserstoff · Carbon hydride nitride (CHN) · Cyaanwaterstof · Cyclon · Cyclone B · Cyjanowodor · RCRA waste number P063 · Zaclondiscoids · Zyklon B · cianuro de hidrogeno · cyanure d'hydrogene · hydrogen cyanide (sara iii) · methanenitrile · Hydrocyanicum acidum

What it does

We don't have a plain-language description for Hydrogen cyanide yet.

Recorded functional uses: Raw material for industry

Is it a concern?
Critical concern: no hazard classifications on record. It is banned in EU cosmetics.

Why it's flagged

Hydrogen cyanide and its salts is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.

RestrictedEU EC — banned

The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.

Regulation

Restrictions first, then routine listings from published regulatory sources.

  • In marketed US drugs
  • EU Annex II — prohibited
  • EU prohibited in cosmetics

Recorded in these product areas

  • Found in consumer products
  • Industrial

  • EUEC

    Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products.

    banned
    View source →
  • EUCosIngActiveCosmetics Regulation annex II / ref 111.
    • Cosmetics Regulation annex II / ref 111.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 28 composition records across product categories including Raw materials, Construction and building materials, Vehicle. EPA CPDat classifies this chemical for functional uses including raw material for industry.
    • EPA CPDat observed this chemical in 28 composition records across product categories including Raw materials, Construction and building materials, Vehicle. EPA CPDat classifies this chemical for functional uses including raw material for industry.Source →
  • USFDAmarketed drug occurrenceFDA NDC lists this ingredient in 7 active drug products and 7 total products.
    • FDA NDC lists this ingredient in 7 active drug products and 7 total products.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for Hydrogen cyanide. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for Hydrogen cyanide yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

8 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EU CosIng Cosmetics Regulation Annexes

    regulatory · updated 2010-10-15

    Open →

  • EPA Chemical and Products Database

    exposure · updated jan 24 1989

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA National Drug Code Directory

    regulatory · updated 2027-12-31

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

No fragrance-linked caution surfaced in the current profile.

Good fit

This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.

Where it has been recorded

How often EPA CPDat has listed Hydrogen cyanide in a product composition. These are source records, not Greenveil catalog products.

Source records

28

Named organisations

6

Raw materialsConstruction and building materialsVehicleRoad vehiclesLaboratory suppliesSpecialty occupational products

Typical roles

Raw material for industry
See products using Hydrogen cyanide →