Perchloromethyl mercaptan

  • PPM
  • Trichloromethyl sulfur chloride
  • Trichloromethanesulfenyl chloride
  • Thiocarbonyl tetrachloride
Formula CCl4S
Description A yellow oily liquid with an offensive odor.
Uses Used as an intermediate for the synthesis of dyes & fungicides (captan, folpet).

Registry Numbers and Inventories.
CAS 594-42-3
EC (EINECS/ELINCS) 209-840-4
EC Risk Phrase R 21 23/25 34
EC Safety Phrase S 26 36/37/39 45
RTECS PB0370000
RTECS class Primary Irritant
UN (DOT) 1670
Beilstein/Gmelin 506034
Beilstein Reference 4-03-00-00290
EPA OPP 477300
Swiss Giftliste 1 G-2707
US TSCA Listed
New Zealand Listed
Japan ENCS (MITI) Listed

Formula CCl4S
Formula mass 185.87
Melting point, C -44
Boiling point, C 149
Vapor pressure, mmHg 4.7 (25 C)
Vapor density (air=1) 6.414
Critical temperature 367
Critical pressure 54.8
Density 1.722 g/cm3 (0 C)
Solubility in water Insoluble
Surface tension 35.02 g/s2 (20 C)
Refractive index 1.54835
Partition coefficient, pKow 4.67
Heat of vaporization 37.2 kJ/mol

Hazards and Protection.
Storage Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection Organic- and acid-type canister mask or self-contained breathing apparatus; goggles or face shield; rubber gloves. Wear appropriate eye protection and protective clothing to prevent skin and eye contact.
Respirators Any self contained breathing apparatus with a full facepiece and operated in a pressure demand or other positive pressure mode or any supplied air respirator with a full facepiece and operated in a pressure demand or other positive pressure mode in combination with an auxiliary self contained breathing apparatus operated in pressure demand or other positive pressure mode.
Small spills/leaks Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability Mildly decomposed by moist air.
Incompatibilities Incompatible with acids, diazo and azo compounds, halocarbons, isocyanates, aldehydes, alkali metals, nitrides, hydrides, and other strong reducing agents Reactions with these materials generate heat and in many cases hydrogen gas Reacts readily with oxidizing agents.
Decomposition Decomposes between 148-9 C.

Flash Point,C 53
Fire fighting Fight fire from maximum distance. Dike fire control water for later disposal; do not scatter the material. Positive pressure breathing apparatus and special protective clothing should be worn.This compound is neither flammable nor a serious fire hazard, although it will support combustion. Fight small fires with dry chemical, carbon dioxide, water spray, or foam, and large fires with water spray, fog, or foam. Move containers containing this compound away from fire area if possible.
Fire potential This compound is neither flammable nor serious fire hazard, although it will support combustion.
Hazards Very irritating vapors formed from hot material; may form phosgene gas, hydrogen chloride, and sulfur dioxide. At high temperatures this compound will decompose to carbon tetrachloride, sulfur chloride, heavy oil polymers, phosgene gas, hydrogen chloride, and sulfur dioxide. Reacts with iron or steel, evolving carbon tetrachloride. Corrosive to most metals. Reacts with water only when hot to give carbon dioxide, hydrochloric acid, and sulfur.
Combustion products Toxic gases and vapors (such as carbon tetrachloride, hydrogen sulfide, sulfur dioxide, and carbon monoxide) may be released in fire involving perchloromethyl mercaptan.
NFPA Health 3
  Flammability 0  
  Reactivity 2  

Exposure limit(s) TLV: 0.1 ppm; 0.76 mg/m3 (ACGIH 1994-1995). OSHA PEL: TWA 0.1 ppm (0.8 mg/m3) NIOSH REL: TWA 0.1 ppm (0.8 mg/m3) NIOSH IDLH: 10 ppm
Poison_Class 1
Exposure effects Fever may be noted in patients with severe inhalation exposure and respiratory tract injury. Central nervous system depression and seizures may develop.
   Ingestion Nausea, vomiting, diarrhea, abdominal pain and mucosal ulceration may be seen.
   Inhalation Severe respiratory tract irritation with cough, chest tightness or discomfort, or pulmonary edema may be seen. Necrotizing tracheitis was found in a fatal case with inhalation and dermal exposure.
   Skin Skin irritation may occur.
   Eyes Inflammation of the eye, tearing, and mucosal irritation of the nose and throat may be noted.

First aid
   Ingestion The possible benefit of early removal of some ingested material by cautious gastric lavage must be weighed against potential complications of bleeding or perforation. Activated charcoal activated charcoal binds most toxic agents and can decrease their systemic absorption if administered soon after ingestion. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists. Treatment should include recommendations listed in the oral exposure section when appropriate.
   Eyes Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

UN number 1670
Response guide 157
Hazard class 6.1
Packing Group I  
Std. Transport # 4921473