Chemical Safety Data Sheet MSDS / SDS
Chlorosulfonic acid
Revision Date:2026-03-20Revision Number:1
Product identifier
- Product name: Chlorosulfonic acid
- CBnumber: CB6270016
- CAS: 7790-94-5
- EINECS Number: 232-234-6
- Synonyms: Sulfurochloridicacid;CHLOROSULFONIC ACID
Relevant identified uses of the substance or mixture and uses advised against
- Relevant identified uses: For R&D use only. Not for medicinal, household or other use.
- Uses advised against: none
Company Identification
- Company: Chemicalbook
- Address: Building 1, Huihuang International, Shangdi 10th Street, Haidian District, Beijing
- Telephone: 010-86108875
GHS Label elements, including precautionary statements
-
Symbol(GHS)
- Signal wordDanger
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P271 Use only outdoors or in a well-ventilated area.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
Hazard statements
H335 May cause respiratory irritation
H330 Fatal if inhaled
H314 Causes severe skin burns and eye damage
Substance
- Product name: Chlorosulfonic acid
- Synonyms: Sulfurochloridicacid;CHLOROSULFONIC ACID
- CAS: 7790-94-5
- EC number: 232-234-6
- MF: ClHO3S
- MW: 116.52
If inhaled
Remove person to fresh air and keep comfortable for breathing. Immediately call a POISON CENTER or doctor/ physician.
In case of skin contact
Take off all contaminated clothing immediately. If on skin, rinse well with water. Call a POISON CENTER or doctor/ physician.
In case of eye contact
Rinse with plenty of water. If easy to do, remove contact lens, if worn. Immediately call a POISON CENTER or doctor/ physician.
If swallowed
Immediately call a POISON CENTER or doctor/ physician. Rinse mouth.
Most important symptoms and effects, both acute and delayed
None known.
Suitable extinguishing media
Dry powder, Dry sand, Carbon dioxide (CO2)
Unsuitable extinguishing media
Water
Specific hazards during fire fighting
No information available.
Specific extinguishing methods
Use extinguishing measures that are appropriate to local circumstances and the surrounding environment. Immediately evacuate personnel to safe areas. Remove undamaged containers from fire area if it is safe to do so.
Special protective equipment for fire-fighters
Use personal protective equipment.
NFPA 704
4
0
2
OX
| HEALTH | 4 | Very short exposure could cause death or major residual injury (e.g. hydrogen cyanide, phosgene, methyl isocyanate, hydrofluoric acid) | |
| FIRE | 0 | Materials that will not burn under typical fire conditions, including intrinsically noncombustible materials such as concrete, stone, and sand. Materials that will not burn in air when exposed to a temperature of 820 °C (1,500 °F) for a period of 5 minutes.(e.g. Carbon tetrachloride) | |
| REACT | 2 | Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water (e.g. white phosphorus, potassium, sodium) | |
| SPEC. HAZ. | OX |
Personal precautions, protective equipment and emergency procedures
Wear suitable protective equipment. Keep people away from and upwind of spill/leak. Ensure adequate ventilation. Entry to non-involved personnel should be controlled around the leakage area by roping off, etc.
Environmental precautions
Prevent product from entering drains.
Methods and materials for containment and cleaning up
Collect as much of the spill as possible with a suitable absorbent material.
Handling
Technical measuresPrevent generation of vapor or mist.
Local/Total ventilation
Ensure adequate ventilation. Handle product only in closed system or provide appropriate exhaust ventilation at machinery. Use a local exhaust ventilation.
Advice on safe handling
Avoid contact with skin, eyes and clothing. Wear personal protective equipment. Wash hands and face thoroughly after handling. Open drum carefully as content may be under pressure. Keep only in original packaging.
Avoidance of contact
Oxidizing agents, Bases, Reducing agents, Combustible material, Powdered metals, water
Storage
Conditions for safe storageKeep container tightly closed. Store in a cool and shaded area. Keep in a well-ventilated place. Protect from moisture. Keep under inert gas. Store locked up.
Ingredients with workplace control parameters
Contains no substances with occupational exposure limit values.
Engineering measures
Install a closed system or local exhaust.
Also install safety shower and eye bath.
Also install safety shower and eye bath.
Personal protective equipment
Respiratory protectionGas mask
Self-contained breathing apparatus
Eye/face protection
Self-contained breathing apparatus
Safety glasses
Safety goggles
Face-shield
Skin and body protection
Safety goggles
Face-shield
Impervious protective clothing
Hand protection
Impervious gloves *Use personal protective equipment(PPE) approved under appropriate government standards and follow local and national regulations.
Information on basic physicochemical properties
- Appearanceliquid
- Colorcolorless - yellow
- OdorNo data available
- Odor ThresholdNo data available
- Solubility(ies)Miscible with hydrocarbons.
- Water solubilitysoluble, Decomposes in contact with water.
- Molecular weight116.52 g/mol
- Viscosity, kinematicNo data available
- Viscosity, dynamicNo data available
- Decomposition temperatureNo data available
- Autoignition temperatureNo data available
- Partition coefficient: n-octanol/waterNo data available
- Solubility in other solventssoluble Solvent: Chloroform soluble Solvent: dichloromethane
- Relative density1.77
- Relative vapor density4.02
- Vapor pressure1.33 Pa (20 °C)
- Lower explosion limit / Lower flammability limit3.3 %(V)
- Upper explosion limit / Upper flammability limit37.7 %(V)
- FlammabilityNo data available
- Evaporation rateNo data available
- Flash point158°C
- Boiling point/boiling range155 °C
- Melting point/freezing pointNo data available
- pH<1 (20°C in H2O, Aqueous solution; rigorous decomposition)
- Physical stateOily Liquid, Fuming In Air
Reactivity
No data available
Chemical stability
Stable under normal conditions.
Possibility of hazardous reactions
Decomposes in contact with water and liberates toxic gases.
Conditions to avoid
Exposure to moisture.
Incompatible materials
Oxidizing agents, Bases, Reducing agents, Combustible material, Powdered metals, water
Hazardous decomposition products
Hydrogen chloride gas
Acute toxicity
Product
Acute oral toxicity
Assessment: The component/mixture is highly toxic after single ingestion.
Acute inhalation toxicity
Assessment: The component/mixture is extremely toxic after short term inhalation.
Components
Chlorosulfonic Acid
Acute oral toxicity
LD50 (Rat): 50 mg/kg Assessment: The component/mixture is highly toxic after single ingestion.
Acute inhalation toxicity
LCLo (Rat): 926 mg/m3 Exposure time: 1 h Test atmosphere: dust/mist Assessment: The component/mixture is extremely toxic after short term inhalation.
Skin corrosion/irritation
Product
Result
Causes severe burns.
Components
Chlorosulfonic Acid
Result
Causes severe burns.
Serious eye damage/eye irritation
Product
Result
Irreversible effects on the eye
Components
Chlorosulfonic Acid
Result
Irreversible effects on the eye
Respiratory or skin sensitization
Classified based on available data. For more details, see section 2.
Germ cell mutagenicity
Classified based on available data. For more details, see section 2.
Carcinogenicity
Classified based on available data. For more details, see section 2.
Reproductive toxicity
Classified based on available data. For more details, see section 2.
STOT-single exposure
Product
Assessment
May cause respiratory irritation.
Target Organs
Respiratory system
Assessment
May cause damage to organs.
Components
Chlorosulfonic Acid
Assessment
May cause respiratory irritation.
Target Organs
Respiratory system
Assessment
May cause damage to organs.
STOT-repeated exposure
Product
Target Organs
Respiratory system
Assessment
May cause damage to organs through prolonged or repeated exposure.
Components
Chlorosulfonic Acid
Target Organs
Respiratory system
Assessment
May cause damage to organs through prolonged or repeated exposure.
Repeated dose toxicity
Classified based on available data. For more details, see section 2.
Aspiration toxicity
Classified based on available data. For more details, see section 2.
RTECS No.
FX5730000 (Chlorosulfonic Acid)
Ecotoxicity
Product:
Ecotoxicology Assessment
Acute aquatic toxicityHarmful to aquatic life.
Components:
Chlorosulfonic Acid:
Ecotoxicology Assessment
Acute aquatic toxicityHarmful to aquatic life.
Persistence and degradability
No data available
Bioaccumulative potential
No data available
Mobility in soil
No data available
Other adverse effects
No data available
Disposal methods
Waste from residuesDisposal in accordance with local and national regulations. Entrust disposal to a licensed waste disposal company.
Contaminated packaging
Disposal in accordance with local and national regulations. Before disposal of used container, remove contents completely.
International Regulations
IATA-DGR
Not permitted for transport
IMDG-Code
UN numberUN 1754
Proper shipping name
CHLOROSULPHONIC ACID
Class
8
Packing group
I
EmS Code
F-A, S-B
Domestic regulation
GB 6944/12268
UN numberUN 1754
Proper shipping name
CHLOROSULPHONIC ACID
Class
8
Packing group
I
Regulations on Safety Management of Hazardous Chemicals
Catalogue of Hazardous ChemicalsListed
The ingredients of this product are reported in the following inventories
CH BAGREGOn the inventory, or in compliance with the inventory
TSCA
All substances listed as active on the TSCA inventory
AICS
On the inventory, or in compliance with the inventory
DSL
All components of this product are on the Canadian DSL
ENCS
On the inventory, or in compliance with the inventory
ISHL
On the inventory, or in compliance with the inventory
KECI
On the inventory, or in compliance with the inventory
PICCS
On the inventory, or in compliance with the inventory
IECSC
On the inventory, or in compliance with the inventory
NZIoC
On the inventory, or in compliance with the inventory
Abbreviations and acronyms
CAS: Chemical Abstracts Service
TWA: Time-Weighted Average
STEL: Short-Term Exposure Limit
LD50: Lethal Dose 50%
LC50: Lethal Concentration 50%
EC50: Effective Concentration 50%
PEL: Permissible Exposure Limit
TLV: Threshold Limit Value
IMDG: International Maritime Dangerous Goods Code
IATA: International Air Transport Association
ADR: European Agreement concerning the International Carriage of Dangerous Goods by Road
DOT: US Department of Transportation
NFPA: National Fire Protection Association
NIOSH: National Institute for Occupational Safety and Health
OSHA: Occupational Safety and Health Administration
TWA: Time-Weighted Average
STEL: Short-Term Exposure Limit
LD50: Lethal Dose 50%
LC50: Lethal Concentration 50%
EC50: Effective Concentration 50%
PEL: Permissible Exposure Limit
TLV: Threshold Limit Value
IMDG: International Maritime Dangerous Goods Code
IATA: International Air Transport Association
ADR: European Agreement concerning the International Carriage of Dangerous Goods by Road
DOT: US Department of Transportation
NFPA: National Fire Protection Association
NIOSH: National Institute for Occupational Safety and Health
OSHA: Occupational Safety and Health Administration
Disclaimer:
The information in this MSDS is only applicable to the specified product, unless otherwise specified, it is not applicable to the mixture of this product and other substances. This MSDS only provides information on the safety of the product for those who have received the appropriate professional training for the user of the product. Users of this MSDS must make independent judgments on the applicability of this SDS. The authors of this MSDS will not be held responsible for any harm caused by the use of this MSDS.