International Chemical Safety Cards DIMETHYL DISULFIDE ICSC: 1586 Methyl disulfide Disulfide, dimethyl- C2H6S2 Molecular mass: 94.2 ICSC #    1586 CAS #     624-92-0 RTECS # JO1927500 UN #        2381 April 21, 2005 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire. NO open flames, NO sparks, and NO smoking. Powder, water spray, foam, carbon dioxide. EXPLOSION Above 24°C explosive vapour/air mixtures may be formed. Above 24°C use a closed system, ventilation, and explosion-proof electrical equipment. In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE  •INHALATION Headache. Nausea. Dizziness. Drowsiness. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN Redness. Protective gloves. Remove contaminated clothes. Rinse and then wash skin with water and soap.  •EYES Redness. Pain. Safety goggles . 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. Rinse mouth. Give a slurry of activated charcoal in water to drink. Do NOT induce vomiting. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Personal protection: filter respirator for organic gases and vapours. Ventilation. Remove all ignition sources. Collect leaking liquid in sealable containers. Do NOT wash away into sewer. Fireproof. Store in an area without drain or sewer access. R: S: UN Hazard Class: 3 UN Packing Group: II SEE IMPORTANT INFORMATION ON BACK ICSC: 1586 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 DIMETHYL DISULFIDE ICSC: 1586 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: LIQUID , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on burning producing toxic and corrosive fumes including sulfur oxides . Reacts violently with oxidants . 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 skin and is irritating to the eyes and the respiratory tract . The substance may cause effects on the central nervous system. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 110°C Melting point: -85°C Relative density (water = 1): 1.06 Solubility in water, g/100 ml at 20°C: 0.25 (very poor) Vapour pressure, kPa at 25°C: 3.8 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.08 Flash point: 24°C c.c. Auto-ignition temperature: >300°C Explosive limits, vol% in air: 1.1-16 Octanol/water partition coefficient as log Pow: 1.77 ENVIRONMENTAL DATA N O T E S Transport Emergency Card: TEC (R)-30GF1-I-II ADDITIONAL INFORMATION ICSC: 1586 DIMETHYL DISULFIDE (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.