What is the CAS number of Sodium hypochlorite?

The CAS Registry Number of Sodium hypochlorite is 7681-52-9.

What is the chemical formula of Sodium hypochlorite?

Sodium hypochlorite has the formula ClNaO and a molecular weight of about 74.44 g/mol.

What are the GHS hazards of Sodium hypochlorite?

Sodium hypochlorite carries the signal word Danger. Its harmonised hazard statements are H314, H318, H400, H410: Causes severe skin burns and eye damage.; Causes serious eye damage.; Very toxic to aquatic life.; Very toxic to aquatic life with long lasting effects..

Which GHS pictograms apply to Sodium hypochlorite?

GHS05 (Corrosion), GHS09 (Environment).

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Sodium hypochlorite CAS 7681-52-9

Sodium hypochlorite (CAS 7681-52-9, formula ClNaO) is an industrial chemical with a molecular weight of about 74.44 g/mol. Its harmonised GHS classification carries the signal word Danger.

Identifiers

Name: Sodium hypochlorite
CAS number: 7681-52-9
CLP index number: 017-011-00-1
EC number: 231-668-3
Molecular formula: ClNaO
Molecular weight: 74.44 g/mol
Also known as: Bleach, Hypochlorite, Bleaching liquor, Chlorinated soda, Sodium hypochlorite solution, Javel water

GHS classification

Harmonised classification under the CLP Regulation (Annex VI), index number 017-011-00-1. Signal word: Danger.

Hazard class	Code	Statement
Skin corrosion/irritation	H314	Causes severe skin burns and eye damage.
Serious eye damage/eye irritation	H318	Causes serious eye damage.
Hazardous to the aquatic environment, acute hazard	H400	Very toxic to aquatic life.
Hazardous to the aquatic environment, long-term hazard	H410	Very toxic to aquatic life with long lasting effects.

Pictograms

GHS05 Corrosion
GHS09 Environment

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 Sodium hypochlorite

If Sodium hypochlorite 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 Sodium hypochlorite 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 Sodium hypochlorite?: The CAS Registry Number of Sodium hypochlorite is 7681-52-9.
What is the chemical formula of Sodium hypochlorite?: Sodium hypochlorite has the formula ClNaO and a molecular weight of about 74.44 g/mol.
What are the GHS hazards of Sodium hypochlorite?: Sodium hypochlorite carries the signal word Danger. Its harmonised hazard statements are H314, H318, H400, H410: Causes severe skin burns and eye damage.; Causes serious eye damage.; Very toxic to aquatic life.; Very toxic to aquatic life with long lasting effects..
Which GHS pictograms apply to Sodium hypochlorite?: GHS05 (Corrosion), GHS09 (Environment).

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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.