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Chemical substance

As-Methylarsonous dichloride

Also known as Methyldichloroarsine, Methyldichlorarsine, Dichloromethylarsine

CAS 593-89-5Formula CH3AsCl2Molar mass 160.86 g/molEC 695-189-5
GHS signal word: Danger. Pictograms: Acute toxicity (severe)
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As-Methylarsonous dichloride chemical structure, CH3AsCl2, CAS 593-89-5
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Liquid
Melting point
-59 °C
Density
1.84 @ 20 °C
HS code
293190
UN number
UN NA1556
Illustrative photo, 200 litre steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is As-Methylarsonous dichloride?

Plain description, key identifiers and synonyms

Methyldichloroarsine appears as a chemical warfare blister agent. Very toxic by inhalation. A colorless liquid with an agreeable odor. Denser than water. Painful burns on contact.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dichloro(methyl)arsane
CAS number
593-89-5 CAS number cross-checked
EC number
695-189-5
Molecular formula
CH3AsCl2
InChIKey
VXRMBBLRHSRVDK-UHFFFAOYSA-N
InChI
InChI=1S/CH3AsCl2/c1-2(3)4/h1H3
SMILES (canonical and isomeric)
C[As](Cl)Cl

Synonyms

  • Methyldichloroarsine
  • Methyldichlorarsine
  • Dichloromethylarsine
  • Methylarsonous dichloride
  • dichloro(methyl)arsane
  • Methylarsine dichloride
  • Arsonous dichloride, As-methyl-
  • Arsonous dichloride, methyl-
  • Arsine, dichloromethyl-
  • TL 294
  • Methyl dichloroarsine
  • Methyldichlorarsin

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Liquidexp.
Melting point
-59 °Cexp.
Density
1.84 @ 20 °Cexp.
Vapour pressure
10 [mm Hg] @24.3 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
160.86 g/molcalc.
Exact mass
159.8828 Dacalc.
LogP (octanol/water)
1.58calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
4calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)

Hazard statements

  • H300 + H310 + H330Fatal if swallowed. Fatal in contact with skin. Fatal if inhaled.
Precautionary statements (18)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN NA1556
Transport hazard class
6.1
Packing group
I

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

As-Methylarsonous dichloride suppliers

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As-Methylarsonous dichloride price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code As-Methylarsonous dichloride is traded under.

HS 2931.90Indicative HS code

Organo-inorganic compounds, other than tetramethyl lead, tetraethyl lead, tributyltin compounds…

World exports in 2024
$3.97B
+5.3% vs 2023, imports $3.93B
2019 to 2024
Top exporters
  1. China28.3%
  2. United States15.6%
  3. Germany15.1%
Top importers
  1. United States14.6%
  2. China13.0%
  3. South Korea8.5%
Reported customs values in USD, not prices.Full trade data

The HS code shown for As-Methylarsonous dichloride is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about As-Methylarsonous dichloride, based on the data on this page

What is As-Methylarsonous dichloride?

Methyldichloroarsine appears as a chemical warfare blister agent. Very toxic by inhalation. A colorless liquid with an agreeable odor. Denser than water. Painful burns on contact.

What is the CAS number of As-Methylarsonous dichloride?

The CAS registry number of As-Methylarsonous dichloride is 593-89-5.

What is the molecular formula and weight of As-Methylarsonous dichloride?

The molecular formula of As-Methylarsonous dichloride is CH3AsCl2 and its molar mass is 160.86 g/mol.

Is As-Methylarsonous dichloride hazardous?

As-Methylarsonous dichloride carries the GHS signal word "Danger". Main hazards: fatal if swallowed. fatal in contact with skin. fatal if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of As-Methylarsonous dichloride?

As-Methylarsonous dichloride is usually classified under HS code 293190 (X. ORGANO-INORGANIC COMPOUNDS, HETEROCYCLIC COMPOUNDS, NUCLEIC ACIDS AND THEIR SALTS…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy As-Methylarsonous dichloride?

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What is the price of As-Methylarsonous dichloride?

Suppliers quote As-Methylarsonous dichloride on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle As-Methylarsonous dichloride

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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