International Chemical Safety Cards PERCHLOROMETHYL MERCAPTAN ICSC: 0311 PERCHLOROMETHYL MERCAPTAN Trichloromethanesulfenyl chloride Trichlormethyl sulfur chloride Thiocarbonyl tetrachloride PMM CCl4S, CCl3SCl Molecular mass: 185.9 CAS # 594-42-3 RTECS # PB0370000 ICSC # 0311 UN # 1670 TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire. In case of fire in the surroundings: all extinguishing agents allowed. EXPLOSION EXPOSURE STRICT HYGIENE! INHALATION Convulsions. Cough. Laboured breathing. Sore throat. Vomiting. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Half-upright position. Artificial respiration if indicated. Refer for medical attention. SKIN MAY BE ABSORBED! Redness (Further see Inhalation). Protective gloves. Protective clothing. Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention. EYES Redness. Pain. Lacrimation. Face shield or eye protection in combination with breathing protection. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor. INGESTION Abdominal cramps. Burning sensation (further see Inhalation). Do not eat, drink, or smoke during work. Rinse mouth. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer (extra personal protection: complete protective clothing including self-contained breathing apparatus). Separated from strong oxidants, iron, steel, food and feedstuffs. Well closed. Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs. UN Hazard Class: 6.1 UN Packing Group: I Marine pollutant. SEE IMPORTANT INFORMATION ON BACK ICSC: 0311 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993 No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and IDLH values.

International Chemical Safety Cards PERCHLOROMETHYL MERCAPTAN ICSC: 0311 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: YELLOW, OILY LIQUID , WITH PUNGENT ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing toxic and corrosive fumes. Reacts slowly with alcohols, oxidants, reducing agents, iron and steel. Attacks many metals. OCCUPATIONAL EXPOSURE LIMITS (OELs): 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 ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its vapour, through the skin and by ingestion. INHALATION RISK: A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C. EFFECTS OF SHORT-TERM EXPOSURE: The substance irritates the eyes, the skin and the respiratory tract. Inhalation of vapour at high concentrations may cause lung oedema (see Notes). Exposure at high concentrations may result in death. The effects may be delayed. Medical observation is indicated. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point (decomposes): 147-148°C Relative density (water = 1): 1.7 Solubility in water: none Vapour pressure, kPa at 20°C: 0.4 Relative vapour density (air = 1): 6.4 ENVIRONMENTAL DATA N O T E S Environmental effects from the substance have not been investigated adequately. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. Immediate administration of an appropriate spray, by a doctor or a person authorized by him/her, should be considered. The name perchloromethyl mercaptan is also used for a compound with CAS number 75-70-7 (Cl3SH). Transport Emergency Card: TEC (R)-61G01 NFPA Code: H 3; F 0; R 2; ADDITIONAL INFORMATION ICSC: 0311 PERCHLOROMETHYL MERCAPTAN © IPCS, CEC, 1993

IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and IDLH values.