International Chemical Safety Cards tert-OCTYL MERCAPTAN ICSC: 1494 2,4,4-Trimethyl-2-pentanethiol tert-Octanethiol 2-Methyl-2-heptanethiol C8H18S / (CH3)2CSHCH2C(CH3)3 Molecular mass: 146.3 ICSC #    1494 CAS #     141-59-3 RTECS # SA3260000 UN #        3023 November 27, 2003 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, carbon dioxide , foam . EXPLOSION Above 46°C explosive vapour/air mixtures may be formed. Above 46°C use a closed system, ventilation, and explosion-proof electrical equipment. In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE STRICT HYGIENE!  •INHALATION Headache. Nausea. Vomiting. Dizziness. Unconsciousness. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Artificial respiration may be needed. Refer for medical attention.  •SKIN Protective gloves. Remove contaminated clothes. Rinse and then wash skin with water and soap.  •EYES Redness. 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. Wash hands before eating. Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). 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: chemical protection suit including self-contained breathing apparatus.) Fireproof. Separated from strong bases, strong acids and oxidants . R: S: UN Hazard Class: 6.1 UN Subsidiary Risks: 3 UN Packing Group: I SEE IMPORTANT INFORMATION ON BACK ICSC: 1494 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 tert-OCTYL MERCAPTAN ICSC: 1494 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 many metals and rubber. OCCUPATIONAL EXPOSURE LIMITS: TLV not established. MAK not established. ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation, through the skin 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 substance may cause effects on the central nervous system , resulting in convulsions , lowering of consciousness and respiratory depression. Exposure may result in death. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 155°C Melting point: -74°C Relative density (water = 1): 0.85 Solubility in water: none Relative vapour density (air = 1): 5.0 Flash point: 46°C o.c. Explosive limits, vol% in air: 0.8-? ENVIRONMENTAL DATA N O T E S Environmental effects from the substance have not been investigated. NFPA Code: H2; F2; R0; Transport Emergency Card: TEC (R)-61GTF1-I ADDITIONAL INFORMATION ICSC: 1494 tert-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.