Safety data sheet reference · CAS 7778-54-3

Calcium hypochlorite SDS

also: calcium hypochlorite MSDS · safety data sheet · Ca(ClO)2 · CAS 7778-54-3 · EC 231-908-7 · pool chlorine · cal hypo

Danger · Category 2–3 Acute Tox. 4 · Skin Corr. 1 Aquatic Acute 1

Flame Over Circle GHS03 Corrosion GHS05 Exclamation Mark GHS07 Environmental Hazard GHS09

Official PDF from supplier

Sigma-Aldrich ↗ Fisher Scientific ↗ Carl Roth ↗

This page is a reference, not the legal document.

CAS number

7778-54-3

EC number

231-908-7

CLP Annex VI index

017-012-00-7

Molecular formula

CaCl2O2

Molar mass

142.98 g/mol

§ 02 · Hazards identification

Harmonised EU classification

CLP Annex VI · Index 017-012-00-7. A supplier SDS may add self-classified hazards — this is the legal minimum.

H272 May intensify fire; oxidiser. Oxidising liquid/solid — Category 2–3

H302 Harmful if swallowed. Acute toxicity, oral — Category 4 (Acute Tox. 4)

H314 Causes severe skin burns and eye damage. Skin corrosion — Category 1 (Skin Corr. 1)

H400 Very toxic to aquatic life. Hazardous to aquatic environment, acute — Category 1 (Aquatic Acute 1)

Precautionary statements

P260 Do not breathe dust/fume/gas/mist/vapours/spray.

P270 Do not eat, drink or smoke when using this product.

P273 Avoid release to the environment.

P280 Wear protective gloves/protective clothing/eye protection/face protection.

P301 IF SWALLOWED: call a POISON CENTER or doctor if you feel unwell.

P310 Immediately call a POISON CENTER or doctor.

P312 Call a POISON CENTER or doctor if you feel unwell.

P330 Rinse mouth.

P331 Do NOT induce vomiting.

P391 Collect spillage.

P501 Dispose of contents/container in accordance with local regulations.

§ 07 · Handling and storage

Computed storage verdict

Never store with 8 storage groups Oxidizers

Derived from CLP Annex VI classification and CAMEO reactive-group data — not copied from a PDF.

⚠ Strong Oxidizing Agent

⛔ Never store with

Cyanides & sulfides Flammable liquids Flammable solids Mineral acids Organic acids Organic peroxides & self-reactives Reactive metals Water-reactives

↔ Keep separate

Bases Compressed gases Acute toxics

Full interactive verdict — reactions, gas release on contact, ADR forms →

§ 09 · Physical and chemical properties

Measured properties

The full physical-property table (melting/boiling point, flash point, explosion limits, vapour pressure, density) is being populated for this substance from ECHA registration data and will appear here as it lands.

§ 10 · Stability and reactivity

Reactive group (CAMEO/NOAA): Oxidizing Agents, Strong, Salts, Basic, Water and Aqueous Solutions. Our database documents 92 incompatible and 46 caution reaction-partner groups for calcium hypochlorite — including which combinations release gas on contact. See the per-partner breakdown with gas release →

Incompatible

Caution

§ 13 · Disposal considerations

Dispose of waste and residues in accordance with local and national regulations — in the EU under the Waste Framework Directive 2008/98/EC. Never discharge to drains or municipal waste; hand contaminated packaging and unused product to an authorised waste-disposal company. The supplier's SDS section 13 lists the applicable waste codes for the specific product.

§ 14 · Transport information

Road transport — ADR 2025

UN number

UN 1748

Proper shipping name

CALCIUM HYPOCHLORITE, DRY or CALCIUM HYPOCHLORITE MIXTURE, DRY with more than 39 % available chlorine (8.8 % available oxygen)

Class · PG

5.1 · II

Classification code

Transport category

ADR labels

5.1

Hazard ID (Kemler) / UN plate

50

1748

Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.

UN number

UN 1748

Proper shipping name

CALCIUM HYPOCHLORITE, DRY or CALCIUM HYPOCHLORITE MIXTURE, DRY with more than 39 % available chlorine (8.8 % available oxygen)

Class · PG

5.1 · III

Classification code

Transport category

ADR labels

5.1

Hazard ID (Kemler) / UN plate

50

1748

Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.

UN number

UN 2208

Proper shipping name

CALCIUM HYPOCHLORITE MIXTURE, DRY with more than 10 % but not more than 39 % available chlorine

Class · PG

5.1 · III

Classification code

Transport category

ADR labels

5.1

Hazard ID (Kemler) / UN plate

50

2208

Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.

UN number

UN 2880

Proper shipping name

CALCIUM HYPOCHLORITE, HYDRATED, or CALCIUM HYPOCHLORITE, HYDRATED MIXTURE, with not less than 5.5 % but not more than 16 % water

Class · PG

5.1 · II

Classification code

Transport category

ADR labels

5.1

Hazard ID (Kemler) / UN plate

50

2880

Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.

UN number

UN 2880

Proper shipping name

CALCIUM HYPOCHLORITE, HYDRATED, or CALCIUM HYPOCHLORITE, HYDRATED MIXTURE, with not less than 5.5 % but not more than 16 % water

Class · PG

5.1 · III

Classification code

Transport category

ADR labels

5.1

Hazard ID (Kemler) / UN plate

50

2880

Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.

UN number

UN 3485

Proper shipping name

CALCIUM HYPOCHLORITE, DRY, CORROSIVE or CALCIUM HYPOCHLORITE MIXTURE, DRY, CORROSIVE with more than 39 % available chlorine (8.8 % available oxygen)

Class · PG

5.1 · II

Classification code

OC2

Transport category

ADR labels

5.1, 8

Hazard ID (Kemler) / UN plate

58

3485

Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.

UN number

UN 3486

Proper shipping name

CALCIUM HYPOCHLORITE MIXTURE, DRY, CORROSIVE with more than 10 % but not more than 39 % available chlorine

Class · PG

5.1 · III

Classification code

OC2

Transport category

ADR labels

5.1, 8

Hazard ID (Kemler) / UN plate

58

3486

Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.

UN number

UN 3487

Proper shipping name

CALCIUM HYPOCHLORITE, HYDRATED, CORROSIVE or CALCIUM HYPOCHLORITE, HYDRATED MIXTURE, CORROSIVE with not less than 5.5 % but not more than 16 % water

Class · PG

5.1 · II

Classification code

OC2

Transport category

ADR labels

5.1, 8

Hazard ID (Kemler) / UN plate

58

3487

Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.

UN number

UN 3487

Proper shipping name

CALCIUM HYPOCHLORITE, HYDRATED, CORROSIVE or CALCIUM HYPOCHLORITE, HYDRATED MIXTURE, CORROSIVE with not less than 5.5 % but not more than 16 % water

Class · PG

5.1 · III

Classification code

OC2

Transport category

ADR labels

5.1, 8

Hazard ID (Kemler) / UN plate

58

3487

Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.

Source: UN ADR 2025 (ECE/TRANS/352), Table A. Road (ADR) only — for sea (IMDG) and air (IATA), consult the supplier's SDS §14.

MSDS vs SDS

MSDS vs SDS: is there a difference?

MSDS (Material Safety Data Sheet) is the older name for the same document. In the US, OSHA's Hazard Communication Standard (2012) adopted the GHS-standardised 16-section Safety Data Sheet; in the EU the format is set by REACH Annex II. So a "calcium hypochlorite MSDS" and a "calcium hypochlorite SDS" refer to the same document — today it is issued as an SDS. Full breakdown of the differences →

Other oxidizers in our database

Compliance hub

From classification to SDS

The classification above corresponds to Section 2 of a Safety Data Sheet. Learn how a compliant 16-section SDS is structured and authored →

GHS label maker

Build the label for calcium hypochlorite

Pictograms, signal word and H-statements combined into a compliant label layout →

§ 16 · Sources

Classification: Regulation (EC) No 1272/2008 (CLP), Annex VI
Transport: UN ADR 2025 (UNECE), Table A
Reactivity: NOAA CAMEO Chemicals reactive-group matrix (public domain)
Physical properties: CAMEO Chemicals (NOAA, public domain) — per-value source references stored in the database
Substance data: PubChem · ECHA

Reference aid only. This page summarises the harmonised EU classification and computed storage guidance — it is not a Safety Data Sheet and does not replace one. Always verify hazards, handling and storage against the supplier's SDS (sections 7 and 10) and local regulations before use. Page updated 2026-07-27.

Frequently asked questions

Is an MSDS the same as an SDS?

In practice, yes. MSDS (Material Safety Data Sheet) is the older name for the same document. In the US, OSHA's Hazard Communication Standard (2012) adopted the GHS-standardised 16-section Safety Data Sheet; in the EU the SDS format is set by REACH Annex II. A document you find labelled "calcium hypochlorite MSDS" is today issued as an SDS.

What GHS pictograms does calcium hypochlorite require?

Under the harmonised EU classification (CLP Annex VI), calcium hypochlorite carries GHS03 and GHS05 and GHS07 and GHS09 with the signal word "Danger". Hazard statements: H272, H302, H314, H400. A supplier's SDS may add self-classified hazards on top of this harmonised minimum.

What should calcium hypochlorite never be stored with?

Based on its storage class (Oxidizers), calcium hypochlorite must not share storage with: Cyanides & sulfides; Flammable liquids; Flammable solids; Mineral acids; Organic acids; Organic peroxides & self-reactives; Reactive metals; Water-reactives. Verify against the supplier's SDS sections 7 and 10 before finalising storage.

Where can I download an official calcium hypochlorite SDS PDF?

From your own supplier — an SDS is issued per product and supplier, so the correct PDF for an inspection is the one matching the product you actually purchased. The supplier links on this page lead to the official SDS libraries of major distributors.