International Chemical Safety Cards n-HEPTANETHIOL ICSC: 1619 n-Heptylthiol n-Thioheptyl alcohol 1-Mercaptoheptane Heptyl mercaptan C7H16S / CH3(CH2)6SH Molecular mass: 132.3 ICSC #    1619 CAS #     1639-09-4 RTECS # MJ1400000 UN #        3336 May 04, 2006 Validated Ma, tatements based on analogy with hexanethiol (ICSC 1523) and octanethiol (ICSC 1493). 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 Above 46°C explosive vapour/air mixtures may be formed. Above 46°C use a closed system, ventilation, and explosion-proof electrical equipment. EXPOSURE  •INHALATION Dizziness. Drowsiness. Headache. Nausea. Ventilation, local exhaust, or breathing protection. Fresh air, rest.  •SKIN Redness. Pain. Protective gloves. Remove contaminated clothes. 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. 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. Separated from strong oxidants, strong bases, strong acids. UN Hazard Class: 3 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 1619 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-HEPTANETHIOL ICSC: 1619 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 oxidants, strong acids, strong bases and reducing agents. The substance decomposes on heating 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 . Exposure at high levels could cause lowering of consciousness. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 176°C Melting point: -43°C Relative density (water = 1): 0.84 Solubility in water: very poor Vapour pressure, kPa at °C: 0.17 Relative vapour density (air = 1): 4.6 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.006 Flash point: 46°C c.c. Explosive limits, vol% in air: 0.9-? Octanol/water partition coefficient as log Pow: 3.7 Viscosity 1.24 cp (20 °C) Refractive index 1.4521 (20 °C) 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-III ADDITIONAL INFORMATION ICSC: 1619 n-HEPTANETHIOL (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.