International Chemical Safety Cards BENZENETHIOL ICSC: 0463 Thiophenol Mercaptobenzene Phenyl mercaptan C6H6S / C6H5SH Molecular mass: 110.2 ICSC #    0463 CAS #     108-98-5 RTECS # DC0525000 UN #        2337 November 25, 1998 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Flammable. Gives off irritating or toxic fumes (or gases) in a fire. NO open flames, NO sparks, and NO smoking. Powder, AFFF, foam, carbon dioxide. EXPLOSION In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE PREVENT GENERATION OF MISTS!  •INHALATION Cough. Headache. Nausea. Sore throat. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN MAY BE ABSORBED! Redness. Pain. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.  •EYES Redness. Pain. Blurred vision. Safety goggles, 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 (See Inhalation). Do not eat, drink, or smoke during work. Rinse mouth. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Chemical protection suit including self-contained breathing apparatus. Separated from strong oxidants, strong acids, food and feedstuffs . Do not transport with food and feedstuffs. R: S: UN Hazard Class: 6.1 UN Subsidiary Risks: 3 UN Packing Group: I SEE IMPORTANT INFORMATION ON BACK ICSC: 0463 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards BENZENETHIOL ICSC: 0463 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS LIQUID , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on burning or on contact with acids producing toxic fumes (sulfur oxides). Reacts with strong oxidants. OCCUPATIONAL EXPOSURE LIMITS: TLV: 0.5 ppm (as TWA) (ACGIH 1998). OSHA PEL: none NIOSH REL: C 0.1 ppm (0.5 mg/m3) 15-minute NIOSH IDLH: No data ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation, through the skin and by ingestion. INHALATION RISK: A harmful contamination of the air can be reached rather 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 . The substance may cause effects on the nervous system. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Repeated or prolonged contact with skin may cause dermatitis. PHYSICAL PROPERTIES Boiling point: 168°C Melting point: -15°C Relative density (water = 1): 1.07 Solubility in water: none Vapour pressure, kPa at 18°C: 0.13 Relative vapour density (air = 1): 3.8 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.00 Flash point: <55°C Explosive limits, vol% in air: 1.2-? Octanol/water partition coefficient as log Pow: 2.52 ENVIRONMENTAL DATA N O T E S Transport Emergency Card: TEC (R)-61G61a ADDITIONAL INFORMATION ICSC: 0463 BENZENETHIOL (C) IPCS, CEC, 1994

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 NIOSH IDLH values.