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
Official PDF from supplier
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
Structural formula
Ca(ClO)2
Molar mass
142.98 g/mol
§ 02 · Hazards identification
Calcium hypochlorite harmonised EU classification
CLP Annex VI · Index 017-012-00-7. A supplier SDS may add self-classified hazards — this is the legal minimum.
Precautionary statements
Codes ending in a colon introduce the action that follows — on a label they are printed as combined statements, such as P305+P351+P338.
§ 03 · Composition and identifiers
Calcium hypochlorite structure
Calcium hypochlorite is an ionic compound — there is no discrete Ca(ClO)2 molecule. The diagram shows the ions the crystal lattice is built from.
Ions of calcium hypochlorite · Ca(ClO)2
Identifiers from PubChem (NIH, public domain). Structure diagram drawn with RDKit from the SMILES string.
§ 04 · First-aid measures
Calcium hypochlorite first aid measures
Call your national emergency number first. These are published first-aid measures, not medical advice, and they do not replace emergency services, a poison control centre or the supplier's safety data sheet.
§4–§6 below reproduce the CAMEO Chemicals entry CALCIUM HYPOCHLORITE. CAMEO publishes response data per product entry, so the entry can describe a solution, a refrigerated liquid or a molten form rather than the pure substance in §9 — check it matches what you are handling.
Refer to the ERG "General First Aid" instructions. Specific First Aid: Contaminated clothing may be a fire risk when dry.
Source: ERG, 2024 — via CAMEO Chemicals (NOAA), public domain.
§ 05 · Fire-fighting measures
Calcium hypochlorite fire fighting measures
ERG 2024 · GUIDE 140 OxidizersERG guidance is written per response guide, not per substance — Guide 140 covers every material assigned to it, so a few sentences reference other UN numbers in the same group.
Fire and explosion hazard
CAUTIONAmmonium nitrate products may explode if involved in fire or contaminated with hydrocarbons (fuels), organic matter, other contaminants or when hot molten and contained. Treat as an explosive (ERG Guide 112). These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard.
Extinguishing media and tactics
SMALL FIREUse water. Do not use dry chemicals or foams. CO2 or Halon® may provide limited control.
LARGE FIREFlood fire area with water from a distance. Do not move cargo or vehicle if cargo has been exposed to heat. If it can be done safely, move undamaged containers away from the area around the fire.
FIRE INVOLVING TANKS, RAIL TANK CARS OR HIGHWAY TANKSFor ammonium nitrate products: Do not fight cargo fire. Withdraw, evacuate and isolate area for at least 1600 meters (1 mile). Treat as an explosive (ERG Guide 112). Do not enter area for 24 hours or until expert advice has been provided. Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. ALWAYS stay away from tanks in direct contact with flames. For massive fire, use unmanned master stream devices or monitor nozzles; if this is impossible, withdraw from area and let fire burn.
Source: ERG, 2024 — via CAMEO Chemicals (NOAA), public domain. Entry: CALCIUM HYPOCHLORITE.
§ 06 · Accidental release measures
Calcium hypochlorite spill and leak response
Containment and clean-up
Keep combustibles (wood, paper, oil, etc.) away from spilled material. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Do not get water inside containers.
SMALL DRY SPILLWith clean shovel, place material into clean, dry container and cover loosely; move containers from spill area.
SMALL LIQUID SPILLUse a non-combustible material like vermiculite or sand to soak up the product and place into a container for later disposal.
LARGE SPILLDike far ahead of liquid spill for later disposal.
Initial isolation and evacuation
IMMEDIATE PRECAUTIONARY MEASUREIsolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.
LARGE SPILLConsider initial downwind evacuation for at least 100 meters (330 feet).
FIREIf tank, rail tank car or highway tank is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. If ammonium nitrate products are in a tank, rail car or truck and involved in a fire, ISOLATE for 1600 meters (1 mile) in all directions; also, initiate evacuation including emergency responders for 1600 meters (1 mile) in all directions.
Source: ERG, 2024 — via CAMEO Chemicals (NOAA), public domain. Entry: CALCIUM HYPOCHLORITE.
§ 07 · Handling and storage
Calcium hypochlorite computed storage compatibility
Derived from CLP Annex VI classification and CAMEO reactive-group data — not copied from a PDF.
⚠ Strong Oxidizing Agent
⛔ Never store with
↔ Keep separate
Full interactive verdict — reactions, gas release on contact, ADR forms →
§ 09 · Physical and chemical properties
Calcium hypochlorite physical 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. Our database documents 75 incompatible and 23 caution reaction-partner groups for calcium hypochlorite — including which combinations release gas on contact. See the per-partner breakdown with gas release →
75
Incompatible
23
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
Calcium hypochlorite road transport — ADR 2025
2 ADR entries under UN 1748
PG II CALCIUM HYPOCHLORITE, DRY or CALCIUM HYPOCHLORITE MIXTURE, DRY with more than 39 % available chlorine (8.8 % available oxygen)
PG III CALCIUM HYPOCHLORITE, DRY or CALCIUM HYPOCHLORITE MIXTURE, DRY with more than 39 % available chlorine (8.8 % available oxygen)
Hazard ID (Kemler) / UN plate
Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.
UN number
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
O2
Transport category
3
ADR labels
5.1
Hazard ID (Kemler) / UN plate
Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.
2 ADR entries under UN 2880
PG II CALCIUM HYPOCHLORITE, HYDRATED, or CALCIUM HYPOCHLORITE, HYDRATED MIXTURE, with not less than 5.5 % but not more than 16 % water
PG III CALCIUM HYPOCHLORITE, HYDRATED, or CALCIUM HYPOCHLORITE, HYDRATED MIXTURE, with not less than 5.5 % but not more than 16 % water
Hazard ID (Kemler) / UN plate
Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.
UN number
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
2
ADR labels
5.1, 8
Hazard ID (Kemler) / UN plate
Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.
UN number
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
3
ADR labels
5.1, 8
Hazard ID (Kemler) / UN plate
Top: hazard identification number (Kemler). Bottom: UN number — as carried on the orange plate of the transport unit.
2 ADR entries under UN 3487
PG II CALCIUM HYPOCHLORITE, HYDRATED, CORROSIVE or CALCIUM HYPOCHLORITE, HYDRATED MIXTURE, CORROSIVE with not less than 5.5 % but not more than 16 % water
PG III CALCIUM HYPOCHLORITE, HYDRATED, CORROSIVE or CALCIUM HYPOCHLORITE, HYDRATED MIXTURE, CORROSIVE with not less than 5.5 % but not more than 16 % water
Hazard ID (Kemler) / UN plate
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
Calcium hypochlorite 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
Substance profile
What calcium hypochlorite is
Physical and chemical properties with the conditions each value was measured under, synonyms, formula and the harmonised CLP classification →
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
- Emergency response (§4–§6): ERG 2024 (PHMSA) · NIOSH Pocket Guide (CDC) · CHRIS (USCG) · NTP · EPA — via CAMEO Chemicals (NOAA), all US federal public domain, reproduced verbatim
- 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 2026-08-11.
Frequently asked questions about calcium hypochlorite
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.
Call emergency services first
112 in the EU · 911 in the US. This screen is published response information, not medical advice, and it does not replace emergency services, a poison centre or the supplier's safety data sheet.
Text below is the CAMEO Chemicals entry CALCIUM HYPOCHLORITE — confirm it matches the form in front of you.
01 · First aid
What to do for the person
Refer to the "General First Aid" section. Specific First Aid: Contaminated clothing may be a fire risk when dry.
02 · Fire
Extinguishing and tactics
Fire and explosion hazard
CAUTIONAmmonium nitrate products may explode if involved in fire or contaminated with hydrocarbons (fuels), organic matter, other contaminants or when hot molten and contained. Treat as an explosive (ERG Guide 112). These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard.
Extinguishing media and tactics
SMALL FIREUse water. Do not use dry chemicals or foams. CO2 or Halon® may provide limited control.
LARGE FIREFlood fire area with water from a distance. Do not move cargo or vehicle if cargo has been exposed to heat. If it can be done safely, move undamaged containers away from the area around the fire.
FIRE INVOLVING TANKS, RAIL TANK CARS OR HIGHWAY TANKSFor ammonium nitrate products: Do not fight cargo fire. Withdraw, evacuate and isolate area for at least 1600 meters (1 mile). Treat as an explosive (ERG Guide 112). Do not enter area for 24 hours or until expert advice has been provided. Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. ALWAYS stay away from tanks in direct contact with flames. For massive fire, use unmanned master stream devices or monitor nozzles; if this is impossible, withdraw from area and let fire burn.
03 · Spill
Containment, isolation, evacuation
Containment and clean-up
Keep combustibles (wood, paper, oil, etc.) away from spilled material. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Do not get water inside containers.
SMALL DRY SPILLWith clean shovel, place material into clean, dry container and cover loosely; move containers from spill area.
SMALL LIQUID SPILLUse a non-combustible material like vermiculite or sand to soak up the product and place into a container for later disposal.
LARGE SPILLDike far ahead of liquid spill for later disposal.
Initial isolation and evacuation
IMMEDIATE PRECAUTIONARY MEASUREIsolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.
LARGE SPILLConsider initial downwind evacuation for at least 100 meters (330 feet).
FIREIf tank, rail tank car or highway tank is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. If ammonium nitrate products are in a tank, rail car or truck and involved in a fire, ISOLATE for 1600 meters (1 mile) in all directions; also, initiate evacuation including emergency responders for 1600 meters (1 mile) in all directions.
Sources: ERG 2024 (PHMSA) · NIOSH Pocket Guide (CDC) · CHRIS (USCG) · NTP · EPA — via CAMEO Chemicals (NOAA), public domain. Text reproduced verbatim.