Empirical Formula: CH₃AsCl₂
Molecular Weight: 160.8621 g/mol
Flash Point: 45.6 °C
Enthalpy of Vaporization: 36.01 kJ/mol
Boiling Point: 138.3 °C at 760 mmHg
Vapour Pressure: 8.43 mmHg at 25 °C
Appearance: A colorless liquid with an agreeable odor
Structure of Methyldichloroarsine (CAS NO.593-89-5):
             
IUPAC Name of Methyldichloroarsine (CAS NO.593-89-5): Dichloro(methyl)arsane
Canonical SMILES: C[As](Cl)Cl
InChI: InChI=1S/CH3AsCl2/c1-2(3)4/h1H3
InChIKey: VXRMBBLRHSRVDK-UHFFFAOYSA-N

Arsenic and its compounds are on the Community Right-To-Know List.

Poison irritant to skin, eyes, and mucous membranes and poison by ingestion and inhalation. A blistering type of military poison. It is rapidly detoxified in the body. A moderately persistent gas. Combustible when exposed to heat or flame. To fight fire, use water, foam, CO₂, dry chemical. Explosive reaction with chlorine. Can react vigorously with oxidizing materials. Dangerous; when heated to decomposition or on contact with acid or acid fumes it emits highly toxic fumes of Cl⁻ and As. See also CHLOROVINYLARSINE DICHLORIDE and ARSENIC COMPOUNDS.

OSHA PEL: TWA 0.5 mg/(As)/m³
DOT Classification:  6.1; Label: Poison

 Methyldichloroarsine ,its cas register number is 593-89-5. It also can be called Arsonous dichloride, As-methyl- ; Arsonous dichloride, methyl- ; Methylarsonous dichloride ;and Dichloromethylarsine . Methyldichloroarsine (CAS NO.593-89-5) is a reducing agent which could react rapidly and dangerously with oxygen and with other oxidizing agents, even weak ones. In one instance, reaction with chlorine rapidly produced gaseous chloromethane, which led to an over pressurization failure [J. Chem. Soc., Dalton Trans., 1976, 1479].