International Chemical Safety Cards 2-MERCAPTOETHANOL ICSC: 0916 2-Hydroxyethanethiol Monothioethyleneglycol Thioglycol C2H6OS / HSCH2CH2OH Molecular mass: 78.1 ICSC #    0916 CAS #     60-24-2 RTECS # KL5600000 UN #        2966 April 10, 1997 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, water spray, foam, carbon dioxide. EXPLOSION Above 74°C explosive vapour/air mixtures may be formed. Above 74°C closed system, ventilation. EXPOSURE PREVENT GENERATION OF MISTS!  •INHALATION Shortness of breath. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.  •SKIN Redness. Pain. Protective gloves, protective clothing. Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.  •EYES Redness. Pain. Face shield, 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 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. Separated from oxidants, metals, food and feedstuffs. Keep in a well-ventilated room. Do not transport with food and feedstuffs. R: S: UN Hazard Class: 6.1 UN Packing Group: I SEE IMPORTANT INFORMATION ON BACK ICSC: 0916 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 2-MERCAPTOETHANOL ICSC: 0916 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 heating producing toxic gases of sulfur oxides. Reacts with oxidants and metals. OCCUPATIONAL EXPOSURE LIMITS: TLV not established. MAK not established. ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its vapour, 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 irritates the eyes, the skin, and the respiratory tract. The substance may cause effects on central nervous system. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 157°C Melting point: <-100°C Relative density (water = 1): 1.1 Solubility in water: miscible Vapour pressure, kPa at 20°C: 0.13 Relative vapour density (air = 1): 2.7 (calculated) Relative density of the vapour/air-mixture at 20°C (air = 1): 1.002 Flash point: 74°C o.c. Auto-ignition temperature: 295°C Explosive limits, vol% in air: 2.3-18 Octanol/water partition coefficient as log Pow: -0.3 (estimated) ENVIRONMENTAL DATA N O T E S Transport Emergency Card: TEC (R)-61G61b NFPA Code: H2; F2; R; ADDITIONAL INFORMATION ICSC: 0916 2-MERCAPTOETHANOL (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.