International Chemical Safety Cards 1-PROPANETHIOL ICSC: 1492 1-Mercaptopropane Propane-1-thiol n-Propyl mercaptan C3H8S / CH3(CH2)2SH Molecular mass: 76.2 ICSC #    1492 CAS #     107-03-9 RTECS # TZ7300000 UN #        2402 April 05, 2006 Validated TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire. Heating will cause rise in pressure with risk of bursting. NO open flames, NO sparks, and NO smoking. powder, foam, carbon dioxide. EXPLOSION Vapour/air mixtures are explosive. Closed system, ventilation, explosion-proof electrical equipment and lighting. In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE  •INHALATION Cough. Drowsiness. Dizziness. Headache, nausea, Ventilation, local exhaust, or breathing protection. Fresh air, rest.  •SKIN Redness. Protective gloves. Rinse and then wash skin with water and soap.  •EYES Redness. Pain. Safety spectacles, 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. Do NOT induce vomiting. Give one or two glasses of water to drink. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Remove all ignition sources. Evacuate danger area! Consult an expert! Personal protection: filter respirator for organic gases and vapours. Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. Fireproof, cool, Keep in a well-ventilated room, separated from strong oxidants, strong bases, strong acids. UN Hazard Class: 3 UN Packing Group: II SEE IMPORTANT INFORMATION ON BACK ICSC: 1492 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 1-PROPANETHIOL ICSC: 1492 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS LIQUID , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: The vapour is heavier than air and may travel along the ground; distant ignition possible. CHEMICAL DANGERS: On combustion, forms corrosive fumes , including hydrogen sulfide and sulfur oxides. Reacts violently with oxidants, reducing agents, strong acids, and strong bases . OCCUPATIONAL EXPOSURE LIMITS: TLV not established. MAK not established. ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation and by ingestion INHALATION RISK: No indication can be given about the rate in which a harmful concentration in the air is reached on evaporation of this substance at 20°C. EFFECTS OF SHORT-TERM EXPOSURE: The substance is irritating to the eyes , the skin and the respiratory tract Exposure at high levels could cause lowering of consciousness. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 68 °C Melting point: -113 °C Relative density (water = 1): 0.84 Solubility in water, g/100 ml at 25°C: 0.190 Vapour pressure, kPa at 25°C: 20.7 (calc.) Relative vapour density (air = 1): 2.63 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.101 Flash point: -20°C Octanol/water partition coefficient as log Pow: 1.7 (estimated) ENVIRONMENTAL DATA N O T E S Health effects of exposure to the substance have not been investigated adequately. Environmental effects from the substance have not been investigated adequately. Transport Emergency Card: TEC (R)-30GF1-I+II Card has been partially updated in January 2008: see Ingestion First Aid. ADDITIONAL INFORMATION ICSC: 1492 1-PROPANETHIOL (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.