International Chemical Safety Cards ACETALDEHYDE ICSC: 0009 ACETALDEHYDE Acetic aldehyde Ethanal Ethyl aldehyde C2H4O/CH3CHO Molecular mass: 44.1 CAS # 75-07-0 RTECS # AB1925000 ICSC # 0009 UN # 1089 EC # 605-003-00-6 TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Extremely flammable. NO open flames, NO sparks, and NO smoking. NO contact with hot surfaces. Powder, alcohol-resistant foam, water in large amounts, 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. Use non-sparking handtools. In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE PREVENT GENERATION OF MISTS! STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR! INHALATION Cough. Drowsiness. Shortness of breath. Unconsciousness. Symptoms may be delayed (see Notes). Ventilation. Local exhaust or breathing protection. Fresh air, rest. Half-upright position. Refer for medical attention. SKIN Redness. Burning sensation. Pain. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention. EYES Redness. Pain. Blurred vision. 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 Burning sensation. Diarrhoea. Dizziness. Nausea. Vomiting (further see Inhalation). Do not eat, drink, or smoke during work. Rinse mouth. Give plenty of water to drink. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Eliminate ignition sources! 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 wash away into sewer. Do NOT absorb in saw-dust or other combustible absorbents. Remove vapour with fine water spray (extra personal protection: self-contained breathing apparatus). Fireproof. Separated from incompatible substances (see Chemical Dangers). Cooled. Keep in the dark. Store only if stabilized. Unbreakable packaging; put breakable packaging into closed unbreakable container. F+ symbol Xn symbol R: 12-36/37-40 S: (2-)16-33-36/37 UN Hazard Class: 3 UN Packing Group: I SEE IMPORTANT INFORMATION ON BACK ICSC: 0009 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993 No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and IDLH values.

International Chemical Safety Cards ACETALDEHYDE ICSC: 0009 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: GAS OR COLOURLESS LIQUID , WITH PUNGENT ODOUR. PHYSICAL DANGERS: The vapour is heavier than air and may travel along the ground; distant ignition possible. CHEMICAL DANGERS: The substance can form explosive peroxides in contact with air. The substance may polymerize under the influence of acids, alkaline materials, such as sodium hydroxide, in the presence of trace metals (iron) with fire or explosion hazard. The substance is a strong reducing agent and reacts violently with oxidants. Reacts violently with various organic substances, halogens, sulfuric acid and amines, causing fire and explosion hazard. OCCUPATIONAL EXPOSURE LIMITS (OELs): TLV: 100 ppm; 180 mg/m3 as TWA (ACGIH 1991-1992). TLV (as STEL): 150 ppm; 270 mg/m3 (ACGIH 1991-1992). OSHA PEL: TWA 200 ppm (360 mg/m3) NIOSH REL: Ca See Appendix A See Appendix C (Aldehydes) NIOSH IDLH: Potential occupational carcinogen 2000 ppm ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation and by ingestion. INHALATION RISK: A harmful contamination of the air can be reached very 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. Inhalation of the vapour may cause lung oedema (see Notes). The substance may cause effects on the central nervous system , resulting in lowering of consciousness. The effects may be delayed. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: Repeated or prolonged contact with skin may cause dermatitis. The substance may have effects on the central nervous system, respiratory tract and kidneys , resulting in chronic alcohol-like intoxication. This substance is possibly carcinogenic to humans. PHYSICAL PROPERTIES Boiling point: 21°C Melting point: -123°C Relative density (water = 1): 0.78 Solubility in water: miscible Vapour pressure, kPa at 20°C: 99 Relative vapour density (air = 1): 1.5 Flash point: -39°C Auto-ignition temperature: 185°C Explosive limits, vol% in air: 4-57 Octanol/water partition coefficient as log Pow: 0.43 ENVIRONMENTAL DATA N O T E S Depending on the degree of exposure, periodic medical examination is indicated. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. An added stabilizer or inhibitor can influence the toxicological properties of this substance, consult an expert. Rinse contaminated clothes (fire hazard) with plenty of water. NFPA Code: H 2; F 4; R 2; ADDITIONAL INFORMATION ICSC: 0009 ACETALDEHYDE © IPCS, CEC, 1993

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 IDLH values.