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Home / Substance database / Sodium hypochlorite Substance database · CAS 7681-52-9

Sodium hypochlorite

bleach solution

What a safety data sheet for sodium hypochlorite and mixtures containing it has to cover – harmonised classification, workplace limits and transport, taken from official sources.

Sources last checked: 14 October 2026 · CLP consolidated version of 1 July 2026 Author: Maximilián Pálffy, chemical engineer This page is not a safety data sheet. We do not publish SDSs of specific products – the figures come from official sources and the binding text is always the legislation itself.
7681-52-9 CAS number
231-668-3 EC number
017-011-00-1 Index number (CLP Annex VI)
UN 1791 UN number (ADR)

Harmonised classification

Entry in CLP Annex VI, Table 3: sodium hypochlorite, solution … % Cl active.

Annex VI, Table 3

Classification

  • Skin Corr. 1B – skin corrosion, category 1B (H314)
  • Eye Dam. 1 – serious eye damage, category 1 (H318)
  • Aquatic Acute 1 – hazardous to the aquatic environment – acute, category 1 (H400)
  • Aquatic Chronic 1 – hazardous to the aquatic environment – chronic, category 1 (H410)
Label elements

Labelling

GHS05 pictogram – corrosion GHS09 pictogram – environment
Signal word: Danger · GHS05, GHS09
  • H314 Causes severe skin burns and eye damage.
  • H410 Very toxic to aquatic life with long lasting effects.
  • EUH031 Contact with acids liberates toxic gas.
  • M-factors: M = 10 (acute aquatic) and M = 1 (chronic aquatic). EUH031 applies at C ≥ 5 %.
  • Note B: the solution is placed on the market at various concentrations, so the label must state the percentage concentration.
 Source: CLP, Annex VI, Part 3 and Annex III

Workplace limits and transport

Occupational exposure limits are national. The values below are those of Slovakia; an SDS states the limits of the country where it is supplied, together with their legal basis.

Government Regulation No 355/2006

Occupational exposure limits (Slovakia)

  • No limit is set for sodium hypochlorite
  • Chlorine, which can be released (EUH031): short-term limit 0.5 ppm / 1.5 mg/m³
ADR 2025

Transport

  • UN 1791 hypochlorite solution – class 8
  • Packing group II (corrosive) or III (slightly corrosive)
  • Label 8 and the environmentally hazardous substance mark
Sources: Government Regulation No 355/2006, Annex 1 (Slov-Lex) · BAM DGG-Info – ADR 2025

What the SDS must cover

All safety data sheets follow the 16 sections of REACH Annex II. For sodium hypochlorite, these points need particular attention:

Section 2 H314 and H410 with pictograms GHS05 and GHS09, EUH031 at C ≥ 5 % and the concentration of active chlorine (Note B).
Section 3 For a mixture: the concentration and the M-factors, which have a strong effect on the aquatic classification of the mixture.
Section 10 Incompatibility with acids – contact releases toxic chlorine.
Section 14 UN 1791, class 8, packing group II or III and the environmental hazard.
Section 15 If the product is sold as a disinfectant, it is also a biocidal product – see biocidal products.
The structure of all 16 sections is described in the SDS template.

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Sources

Sources last checked: 14 October 2026. Always use the consolidated versions of the legislation.