What is the CAS number of Benzene?

The CAS Registry Number of Benzene is 71-43-2.

What is the chemical formula of Benzene?

Benzene has the formula C6H6 and a molecular weight of about 78.11 g/mol.

What are the GHS hazards of Benzene?

Benzene carries the signal word Danger. Its harmonised hazard statements are H225, H304, H315, H319, H340, H350, H372: Highly flammable liquid and vapour.; May be fatal if swallowed and enters airways.; Causes skin irritation.; Causes serious eye irritation.; May cause genetic defects.; May cause cancer.; Causes damage to organs through prolonged or repeated exposure..

Which GHS pictograms apply to Benzene?

GHS02 (Flame), GHS07 (Exclamation mark), GHS08 (Health hazard).

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Benzene CAS 71-43-2

Benzene (CAS 71-43-2, formula C6H6) is an industrial chemical with a molecular weight of about 78.11 g/mol. Its harmonised GHS classification carries the signal word Danger.

Identifiers

Name: Benzene
CAS number: 71-43-2
CLP index number: 601-020-00-8
EC number: 200-753-7
Molecular formula: C6H6
Molecular weight: 78.11 g/mol
Also known as: Benzol, Phenyl hydride, Coal naphtha, Cyclohexatriene, Bensol, Pyrobenzol

GHS classification

Harmonised classification under the CLP Regulation (Annex VI), index number 601-020-00-8. Signal word: Danger.

Hazard class	Code	Statement
Flammable liquids	H225	Highly flammable liquid and vapour.
Aspiration hazard	H304	May be fatal if swallowed and enters airways.
Skin corrosion/irritation	H315	Causes skin irritation.
Serious eye damage/eye irritation	H319	Causes serious eye irritation.
Germ cell mutagenicity	H340	May cause genetic defects.
Carcinogenicity	H350	May cause cancer.
Specific target organ toxicity, repeated exposure	H372	Causes damage to organs through prolonged or repeated exposure.

Pictograms

GHS02 Flame
GHS07 Exclamation mark
GHS08 Health hazard

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 Benzene

If Benzene 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 Benzene 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 Benzene?: The CAS Registry Number of Benzene is 71-43-2.
What is the chemical formula of Benzene?: Benzene has the formula C6H6 and a molecular weight of about 78.11 g/mol.
What are the GHS hazards of Benzene?: Benzene carries the signal word Danger. Its harmonised hazard statements are H225, H304, H315, H319, H340, H350, H372: Highly flammable liquid and vapour.; May be fatal if swallowed and enters airways.; Causes skin irritation.; Causes serious eye irritation.; May cause genetic defects.; May cause cancer.; Causes damage to organs through prolonged or repeated exposure..
Which GHS pictograms apply to Benzene?: GHS02 (Flame), GHS07 (Exclamation mark), GHS08 (Health hazard).

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