International Chemical Safety Cards 1-HEXADECANETHIOL ICSC: 0025 Hexadecyl mercaptan 1-Mercaptohexadecane Cetyl mercaptan CH3(CH2)15SH Molecular mass: 258.5 ICSC #    0025 CAS #     2917-26-2 RTECS # 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, AFFF, foam, carbon dioxide. EXPLOSION EXPOSURE  •INHALATION Dizziness. Headache. Nausea. Sore throat. Unconsciousness. Weakness. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN Redness. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse skin with plenty of water or shower.  •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 Do not eat, drink, or smoke during work. Rinse mouth. 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. Carefully collect remainder. Separated from strong oxidants, reducing agents, alkali metals, acids. R: S: SEE IMPORTANT INFORMATION ON BACK ICSC: 0025 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 2002. 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 1-HEXADECANETHIOL ICSC: 0025 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: LIQUID OR SOLID IN VARIOUS FORMS , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on burning producing highly toxic gases including sulfur oxides. Reacts violently with strong oxidants, acids, reducing agents, alkali metals. OCCUPATIONAL EXPOSURE LIMITS: TLV not established. MAK not established. OSHA PEL: none NIOSH REL: C 0.5 ppm (5.3 mg/m3) 15-minute NIOSH IDLH: No data ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation, through the skin, and by ingestion. INHALATION RISK: A harmful contamination of the air will be reached rather slowly 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 the central nervous system , resulting in respiratory failure. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Repeated or prolonged contact with skin may cause dermatitis. PHYSICAL PROPERTIES Melting point: 18°C Relative density (water = 1): 0.84 Solubility in water: none Vapour pressure, Pa at 20°C: 10 Relative vapour density (air = 1): 8.9 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.00 Flash point: 135°C o.c. Auto-ignition temperature: see Notes Explosive limits, vol% in air: see Notes ENVIRONMENTAL DATA N O T E S Auto-ignition temperature is unknown in literature. Explosive limits are unknown in literature. ADDITIONAL INFORMATION ICSC: 0025 1-HEXADECANETHIOL (C) IPCS, CEC, 2002

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.