IUPAC Name: dichloro-ethyl-sulfanylidene-$l^{5}-phosphane
Synonyms of Ethyl phosphonothioic dichloride (CAS NO.993-43-1): EINECS 213-609-3 ; Ethylphosphonothioic dichloride ; Phosphonothioic dichloride, P-ethyl- ; Phosphonothioic dichloride, ethyl- ; Ethyl phosphonothioic dichloride, anhydrous ; Ethyl phosphonothioic dichloride, anhydrous [NA2927] [Poison] ; NA2927 ; Phosphonothioic dichloride, ethyl- ;
CAS NO.: 993-43-1 
Molecular Formula: C₂H₅Cl₂PS               
Molecular Weight: 163.00     
Index of Refraction: 1.516
 Surface Tension: 45.5 dyne/cm
Density: 1.401 g/cm³
Flash Point: 57.6 °C
Enthalpy of Vaporization: 39.12 kJ/mol
Boiling Point: 171.6 °C at 760 mmHg
Vapour Pressure: 1.84 mmHg at 25°C 
                                  
Molecular Structure: 

Reported in EPA TSCA Inventory.

A corrosive. When of Ethyl phosphonothioic dichloride (CAS NO.993-43-1) is heated to decomposition it emits toxic vapors of SO_x, PO_x, and Cl⁻.

DOT Classification:  6.1; Label: Poison, Corrosive

General Description of Ethyl phosphonothioic dichloride (CAS NO.993-43-1):  A clear colorless liquid with a pungent odor. Burns, but may be difficult to ignite. Denser than water. Very toxic by inhalation. Corrosive to metals and tissue.
Air & Water Reactions:  Reacts with water to form hydrogen chloride(hydrochloric acid)
Reactivity Profile:  An acid halide and organothiophosphate. Acid halides are water reactive; some are violently reactive. They are incompatible with strong oxidizing agents, alcohols, amines, alkali. May react vigorously or explosively if mixed with diisopropyl ether or other ethers in the presence of trace amounts of metal salts [J. Haz. Mat., 1981, 4, 291]. Organothiophosphates are susceptible to formation of highly toxic and flammable phosphine gas in the presence of strong reducing agents such as hydrides. Partial oxidation by oxidizing agents may result in the release of toxic phosphorus oxides.
Health Hazard:  GAS PRODUCED IN REACTION WITH WATER. POISONOUS IF INHALED. Irritating to eyes, nose and throat. LIQUID: Irritating to skin and eyes. Harmful if swallowed.
Fire Hazard:  Combustible. POISONOUS GASES ARE PRODUCED IN FIRE. Oxides of sulfur, phosphorus; hydrogen chloride and phosgene. Contact with water applied to adjacent fires will produce irritating fumes of hydrogen chloride.