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Chlorine monoxide
Also known as: Chlorine monoxide · Dichlorine monoxide · Dichlorine oxide · Oxygen dichloride
- CAS No.
- 7791-21-1
- Formula
- Cl2O
- Molar mass
- 86.9 g/mol
- PubChem CID
- 24646
Corrosive
Environmental hazard
Summary
Chlorine monoxide (Cl2O), CAS 7791-21-1. Common in labs and industry. Read on for hazards, storage, PPE and mixing rules.
Background
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Physical properties
Sourced from PubChem Experimental Properties. Values may vary between sources and conditions.
Hazards
Storage
Keep at room temperature, below 30 °C, out of direct heat.
Store somewhere well-ventilated and away from any ignition source.
Metal drums or tinted glass, tightly sealed.
Strong acids, strong bases and powerful oxidizers.
Personal protective equipment
Nitrile or butyl, at least 0.4 mm thick.
Safety goggles with side shields.
A2 organic-vapor cartridge if the room isn't well ventilated.
Occupational exposure limits (HSE)
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EU harmonised classification (ECHA C&L)
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Transport
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Compatibilities
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Open comparator with Chlorine monoxidePractical safety notes
- Corrosive. Wear chemical goggles, faceshield and chemical-resistant gloves. Have an eyewash within reach.
- Environmental hazard. Do not release to sewers or waterways; collect for hazardous waste disposal.
Derived from the GHS classification shown above. These notes are generic guidance and do not replace the manufacturer's SDS or your local risk assessment.
FAQ
Is Chlorine monoxide flammable?+
Chlorine monoxide (CAS 7791-21-1) does not carry the GHS02 flame pictogram in our records. Always confirm with the manufacturer's SDS section 9 (flash point) before assuming a product is non-flammable.
What PPE should I wear when handling Chlorine monoxide?+
Chemical-splash goggles and a faceshield, chemical-resistant gloves (nitrile or butyl) and an apron are the minimum. Ventilation should be sufficient to keep vapours below the occupational exposure limit. Check SDS section 8 for material-specific breakthrough times.
How should Chlorine monoxide be stored?+
Store Chlorine monoxide (CAS 7791-21-1) in tightly closed original containers, in a cool, dry, well-ventilated area away from incompatible materials. Segregate acids from bases and keep away from metals that can be attacked.
Is Chlorine monoxide dangerous for the environment?+
Yes. Chlorine monoxide carries the GHS09 environment pictogram. Do not release to drains, soil or waterways; collect residues for hazardous-waste disposal in line with local regulations.
Where can I find the official Safety Data Sheet for Chlorine monoxide?+
Official, up-to-date SDS documents are published by each manufacturer (Sigma-Aldrich, Merck, Thermo Fisher, VWR, Carl Roth, etc.) and by regulators such as ECHA and NIOSH. This page is an educational summary and does not replace the manufacturer's SDS.
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