International Chemical Safety Cards n-HEXANETHIOL ICSC: 1523 1-Mercaptohexane 1-Hexylthiol Hexyl mercaptan C6H14S / CH3(CH2)5SH Molecular mass: 118.2 ICSC #    1523 CAS #     111-31-9 RTECS # MO4550000 UN #        3336 April 20, 2004 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, alcohol-resistant foam, water spray, carbon dioxide. EXPLOSION EXPOSURE  •INHALATION Headache. Dizziness. Drowsiness. Nausea. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN Redness. Pain. Protective gloves. Remove contaminated clothes. Rinse skin with plenty of water or shower.  •EYES Redness. Pain. Safety spectacles, 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 Burning sensation in the throat and chest. (Further see Inhalation). Do not eat, drink, or smoke during work. Rinse mouth. Give plenty of water to drink. Do NOT induce vomiting. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Remove all ignition sources. Cover the spilled material with absorbent material. Sweep spilled substance into sealable containers. Do NOT wash away into sewer. Personal protection: filter respirator for organic gases and vapours. Fireproof. R: S: UN Hazard Class: 3 UN Packing Group: II SEE IMPORTANT INFORMATION ON BACK ICSC: 1523 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 n-HEXANETHIOL ICSC: 1523 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: Reacts with acids , bases and strong oxidants . The substance decomposes on burning producing toxic and corrosive fumes including hydrogen sulfide and sulfur oxides . 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 . The substance may cause effects on the central nervous system , resulting in lowering of consciousness . EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 151°C Relative density (water = 1): 0.84 Solubility in water: none Vapour pressure, kPa at 40°C: 0.16 Relative vapour density (air = 1): 5.04 Flash point: 30°C Explosive limits, vol% in air: 0.7-5.5 Octanol/water partition coefficient as log Pow: 5.35 ENVIRONMENTAL DATA N O T E S Health effects of exposure to the substance have not been investigated adequately. Transport Emergency Card: TEC (R)-30GF1-I+II ADDITIONAL INFORMATION ICSC: 1523 n-HEXANETHIOL (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.