What is the CAS number of Formaldehyde?

The CAS Registry Number of Formaldehyde is 50-00-0.

What is the chemical formula of Formaldehyde?

Formaldehyde has the formula CH2O and a molecular weight of about 30.03 g/mol.

What are the GHS hazards of Formaldehyde?

Formaldehyde carries the signal word Danger. Its harmonised hazard statements are H302, H314, H317, H330, H341, H350: Harmful if swallowed.; Causes severe skin burns and eye damage.; May cause an allergic skin reaction.; Fatal if inhaled.; Suspected of causing genetic defects.; May cause cancer..

Which GHS pictograms apply to Formaldehyde?

GHS05 (Corrosion), GHS06 (Skull and crossbones), GHS08 (Health hazard).

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Formaldehyde CAS 50-00-0

Formaldehyde (CAS 50-00-0, formula CH2O) is an industrial chemical with a molecular weight of about 30.03 g/mol. Its harmonised GHS classification carries the signal word Danger.

Identifiers

Name: Formaldehyde
CAS number: 50-00-0
CLP index number: 605-001-00-5
EC number: 200-001-8
Molecular formula: CH2O
Molecular weight: 30.03 g/mol
Also known as: Methanal, Formalin, Formol, Methyl aldehyde, Methylene oxide, Formaldehyde solution (37%)

GHS classification

Harmonised classification under the CLP Regulation (Annex VI), index number 605-001-00-5. Signal word: Danger.

Hazard class	Code	Statement
Acute toxicity, oral	H302	Harmful if swallowed.
Skin corrosion/irritation	H314	Causes severe skin burns and eye damage.
Sensitization, Skin	H317	May cause an allergic skin reaction.
Acute toxicity, inhalation	H330	Fatal if inhaled.
Germ cell mutagenicity	H341	Suspected of causing genetic defects.
Carcinogenicity	H350	May cause cancer.

Pictograms

GHS05 Corrosion
GHS06 Skull and crossbones
GHS08 Health hazard

The harmonised entry for this substance applies at defined concentration ranges, and specific concentration limits and notes in Annex VI can change the classification of solutions and mixtures.

Suppliers may classify additional hazards from their own data, so a supplier's Safety Data Sheet can list more than the harmonised entry.

Source: Regulation (EC) No 1272/2008, Annex VI, retrieved 2026-10-10. Confirm against the current consolidated text and your supplier's SDS before relying on it.

Creating a Safety Data Sheet for a product containing Formaldehyde

If Formaldehyde is an ingredient, record its CAS number and concentration in Section 3 and use it in the mixture classification that drives Section 2 and the label.

How to write a Safety Data Sheet · GHS mixture classification

Prepare SDS and labels in SDS Desk

Add Formaldehyde by name or CAS number, build your product composition and export a reviewed 16-section SDS. 7-day free trial.

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Frequently asked questions

What is the CAS number of Formaldehyde?: The CAS Registry Number of Formaldehyde is 50-00-0.
What is the chemical formula of Formaldehyde?: Formaldehyde has the formula CH2O and a molecular weight of about 30.03 g/mol.
What are the GHS hazards of Formaldehyde?: Formaldehyde carries the signal word Danger. Its harmonised hazard statements are H302, H314, H317, H330, H341, H350: Harmful if swallowed.; Causes severe skin burns and eye damage.; May cause an allergic skin reaction.; Fatal if inhaled.; Suspected of causing genetic defects.; May cause cancer..
Which GHS pictograms apply to Formaldehyde?: GHS05 (Corrosion), GHS06 (Skull and crossbones), GHS08 (Health hazard).

Other chemicals

Acetic acid CAS 64-19-7
Acetone CAS 67-64-1
Ammonia CAS 7664-41-7
Benzene CAS 71-43-2

Information is provided for general reference and is not a substitute for a supplier's Safety Data Sheet or professional advice. See our disclaimer.