International Chemical Safety Cards 3-PENTANONE ICSC: 0874 Diethyl ketone Dimethylacetone Methacetone C5H10O / CH3CH2COCH2CH3 Molecular mass: 86.1 ICSC #    0874 CAS #     96-22-0 RTECS # SA8050000 UN #        1156 EC #         606-006-00-5 March 28, 1996 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Highly flammable. NO open flames, NO sparks, and NO smoking. AFFF, alcohol-resistant foam, powder, carbon dioxide. EXPLOSION Vapour/air mixtures are explosive. Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT use compressed air for filling, discharging, or handling. In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE  •INHALATION Cough. Shortness of breath. Ventilation. Fresh air, rest. Refer for medical attention.  •SKIN Dry skin. Redness. Protective gloves. Remove contaminated clothes. Rinse skin with plenty of water or shower.  •EYES Redness. Safety spectacles. 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 Ventilation. Collect leaking liquid in sealable metal (mild steel) containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. (Extra personal protection: filter A for organic vapours). Fireproof. Separated from oxidants. F symbol R: 11 S: 2-9-16-33 UN Hazard Class: 3 UN Packing Group: II SEE IMPORTANT INFORMATION ON BACK ICSC: 0874 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 3-PENTANONE ICSC: 0874 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. The vapour mixes well with air, explosive mixtures are easily formed. CHEMICAL DANGERS: Reacts violently with oxidants, causing fire and explosion hazard. Attacks many plastics. OCCUPATIONAL EXPOSURE LIMITS: TLV: 200 ppm; 705 mg/m3 (ACGIH 1995-1996). OSHA PEL: none NIOSH REL: TWA 200 ppm (705 mg/m3) NIOSH IDLH: No data ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its vapour. INHALATION RISK: A harmful contamination of the air can be reached rather quickly on evaporation of this substance at 20°C. EFFECTS OF SHORT-TERM EXPOSURE: The substance irritates the eyes, the skin and the respiratory tract. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: The liquid defats the skin. PHYSICAL PROPERTIES Boiling point: 102°C Melting point: -42°C Relative density (water = 1): (25°C) 0.81 Solubility in water: moderate Vapour pressure, kPa at 20°C: 2.0 Relative vapour density (air = 1): 3.0 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.01 Flash point: 13°C o.c. Auto-ignition temperature: 452°C Explosive limits, vol% in air: 1.6-3 Octanol/water partition coefficient as log Pow: 0.99 (estimated) ENVIRONMENTAL DATA N O T E S Transport Emergency Card: TEC (R)-30G30 NFPA Code: H1; F3; R0; ADDITIONAL INFORMATION ICSC: 0874 3-PENTANONE (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.