Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
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EC number: 253-425-0 | CAS number: 37247-91-9
Guidance on Safe Use
Administrative data
First-aid measures
Eyes: Rinse eyes immediately with plenty of water and seek medical advice.
Inhalation: Move to fresh air and obtain medical attention.
Ingestion: Clean mouth with water and drink afterwards plenty of water. Do NOT induce vomiting. Obtain medical attention.
Skin: Carefully and gently brush the contaminated body surfaces in order to remove all traces of product. Wash affected area immediately with plenty of water Remove contaminated clothing. If necessary seek medical advice.
General advice: No known delayed effects. Consult a physician for all exposures except for minor instances.
Fire-fighting measures
Flammability: The substance is not flammable, and non-combustible, it inhibits the spread of flame. The product reacts with water and generates heat. This may cause risk to flammable material.
Avoid water and the humidification of the product.
Suitable extinguishing media: The product is not combustible. Use a dry powder, foam or CO2 extinguisher to extinguish surrounding fire.
Use extinguishing measures that are appropriate to local circumstances and the surrounding environment.
Unsuitable extinguishing media: Do NOT use water.
Accidental release measures
Personal precautions: Avoid contact with skin and eyes, keep dust levels to a minimum, and ensure that sufficient ventilation or suitable respiratory protective equipment is used.
Environmental precautions: Contain the spillage. Keep the material dry if possible. Cover area if possible to avoid unnecessary dust hazard. Avoid uncontrolled spills to watercourses and drains (elevated pH). Any large spillage into watercourses must be alerted to the agency responsible for environmental protection or other regulatory body.
Methods for cleaning up: Keep the material dry if possible. Pick up the product mechanically in a dry way. Use vacuum suction unit, or shovel into bags.
Handling and storage
Precautions for safe handling: Avoid contact with skin and eyes. Wear protective equipment. Keep dust levels to a minimum. Minimise dust generation. Enclose dust sources, use exhaust ventilation (dust collector at handling points). Handling systems should preferably be enclosed. When manually handling bags usual precautions should be paid to the risks outlined in the Council Directive 90/269/EEC.
Precautions for safe storage: Store under dry conditions. Minimise contact with air and moisture. Bulk storage should be in purpose – designed silos. Keep away from acids, significant quantities of paper, straw, and nitro compounds. Keep out of reach of children. Do not use aluminium for transport or storage if there is a risk of contact with water.
Transport information
Land transport (UN RTDG/ADR/RID)
- UN number:
- 1910
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SpecialProvisionsopen allclose all
Inland waterway transport (UN RTDG/ADN(R))
- UN number:
- 1910
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Marine transport (UN RTDG/IMDG)
- UN number:
- 1910
Shipping information
- Proper shipping name and description:
- Calcium oxide
- Chemical name:
- Calcium magnesium oxide
- Labels:
- None
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Air transport (UN RTDG/ICAO/IATA)
- UN number:
- 1910
Shipping information
- Proper shipping name and description:
- Calcium oxide
- Chemical name:
- Calcium magnesium oxide
- Labels:
- None
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Additional transport information
Additional information
- Special provisions / remarks / other:
- Avoid any release of dust during transportation, by using tight tanks for powders and covered trucks for pebbles.
Exposure controls / personal protection
Occupational exposure limits: OEL = 1 mg/m³ (8-h TWA, respirable dust); STEL = 4 mg/m³ (15 min);
proposal based on read-across from CaO and Ca(OH)2 according to SCOEL/SUM/137 February 2008
Occupational exposure controls: As specified in the exposure scenarios for the respective identified use.
Respiratory protection: Use appropriate respiratory protection against particles according to the risk level.
Hand protection: Use approved nitrile impregnated gloves having CE marks.
Eye protection: Tightly fitting goggles with side shields, or wide vision full goggles. Do not wear contact lenses when handling this product. It is also advisable to have individual pocket eyewash.
Skin protection: Clothing fully covering skin, full length trousers, long sleeved overalls, with close fittings at openings. Footwear resistant to caustics, and avoiding dust penetration.
General safety and hygiene measure: Wear clean, dry personal protective equipment. Barrier cream can be used if necessary.
If heavily exposed daily, employees must shower, and if necessary use a barrier cream to protect exposed skin, particularly neck, face and wrists.
Environmental exposure controls: All ventilation systems should be filtered before discharge to atmosphere.
Stability and reactivity
Conditions to avoid: Minimise exposure to air and moisture to avoid degradation.
Materials to avoid: Calcium magnesium oxide reacts exothermically with water to form calcium dihydroxide:
CaO.MgO + H2O → Ca(OH)2 + MgO +1155 kJ/kg CaO
Calcium magnesium oxide reacts exothermically with acids to form calcium and magnesium salts.
Calcium magnesium oxide reacts with aluminium and brass in the presence of moisture under formation (or release) of hydrogen gas:
CaO.MgO + 2 Al + 7 H2O → MgO + Ca (Al (OH)4)2 + 3 H2
Additional remarks: Calcium magnesium oxide absorbs moisture and carbon dioxide from air to form calcium magnesium carbonate (dolomite), which is a common material in nature: CaO.MgO+ 2 CO2 → CaCO3.MgCO3 + H2O
Disposal considerations
Dispose of contents/container to hazardous waste collection point.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
