International Chemical Safety Cards ETHYLHEXALDEHYDE ICSC: 0621 Ethylhexanal 2-Ethylhexanal 2-Ethylcaproaldehyde Butyl ethyl acetaldehyde C8H16O / C4H9CH(C2H5)CHO Molecular mass: 128.24 ICSC #    0621 CAS #     123-05-7 RTECS # MN7525000 UN #        1191 April 11, 1997 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Flammable. NO open flames, NO sparks, and NO smoking. NO contact with hot surfaces. Powder, AFFF, foam, carbon dioxide. 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 PREVENT GENERATION OF MISTS!  •INHALATION Cough. Sore throat. Ventilation. Fresh air, rest. Artificial respiration if indicated. Refer for medical attention.  •SKIN Dry skin. Redness. (See Inhalation). Protective gloves. Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.  •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 Abdominal pain. Nausea. Vomiting. Do not eat, drink, or smoke during work. Rinse mouth. Rest. 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. Do NOT let this chemical enter the environment. (Extra personal protection: filter respirator for organic gases and vapours). Fireproof. Separated from acids, bases, oxidants. Cool. Well closed. Airtight. R: S: UN Hazard Class: 3 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 0621 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 ETHYLHEXALDEHYDE ICSC: 0621 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. CHEMICAL DANGERS: The substance can form explosive peroxides on prolonged contact with oxygen or air. The substance polymerize on contact with sodium hydroxide, ammonia, butyl- and dibutylamine, inorganic acids. Reacts with oxidants. OCCUPATIONAL EXPOSURE LIMITS: TLV not established. ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation of its vapour 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 and the skin. The vapour irritates the respiratory tract. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Repeated or prolonged contact with skin may cause dermatitis. PHYSICAL PROPERTIES Boiling point: 163°C Melting point: -85°C Relative density (water = 1): 0.85 Solubility in water, g/100 ml at 20°C: 0.07 Vapour pressure, Pa at 20°C: 200 Relative vapour density (air = 1): 4.5 Flash point: 46°C c.c., 52°C o.c. Auto-ignition temperature: 180°C Explosive limits, vol% in air: 0.85-7.2 ENVIRONMENTAL DATA The substance is harmful to aquatic organisms. N O T E S Check for peroxides prior to distillation; eliminate if found. Transport Emergency Card: TEC (R)-30G35 NFPA Code: H2; F2; R1; ADDITIONAL INFORMATION ICSC: 0621 ETHYLHEXALDEHYDE (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.