International Chemical Safety Cards n-OCTYL MERCAPTAN ICSC: 1493 1-Octanethiol 1-Mercaptooctane 1-Octylthiol C8H18S / CH2SH(CH2)6CH3 Molecular mass: 146.3 ICSC #    1493 CAS #     111-88-6 RTECS # November 27, 2003 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Combustible. Gives off irritating or toxic fumes (or gases) in a fire. NO open flames. Powder, carbon dioxide , foam . EXPLOSION Above 69°C explosive vapour/air mixtures may be formed. Above 69°C use a closed system, ventilation. EXPOSURE  •INHALATION Cough. Sore throat. Headache. Nausea. Vomiting. Dizziness. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN Redness. Protective gloves. Rinse and then wash skin with water and soap.  •EYES Redness. Safety spectacles. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.  •INGESTION Headache. Nausea. Vomiting. Dizziness. Do not eat, drink, or smoke during work. Rinse mouth. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING 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. (Extra personal protection: filter respirator for organic gases and vapours.) Do NOT let this chemical enter the environment. Fireproof. Separated from strong bases, strong acids and oxidants . R: S: SEE IMPORTANT INFORMATION ON BACK ICSC: 1493 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-OCTYL MERCAPTAN ICSC: 1493 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 producing toxic gases including hydrogen sulfide and sulfur oxides . Reacts violently with oxidants causing fire hazard. Reacts with strong acids , strong bases and strong reducing agents . Attacks metal and rubber. 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 mildly irritating to the eyes , the skin and the respiratory tract . The substance may cause effects on the central nervous system . Exposure at high levels may result in lowering of consciousness. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 199°C Melting point: -49°C Relative density (water = 1): 0.84 Solubility in water: none Vapour pressure, kPa at 25°C: 0.06 Relative vapour density (air = 1): 5.0 Relative density of the vapour/air-mixture at 20°C (air = 1): 1 Flash point: 69°C o.c. Explosive limits, vol% in air: 0.8-? Octanol/water partition coefficient as log Pow: 4.21 (estimated) ENVIRONMENTAL DATA The substance is very toxic to aquatic organisms. N O T E S NFPA Code: H2; F2; R1; ADDITIONAL INFORMATION ICSC: 1493 n-OCTYL MERCAPTAN (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.