METHYL VINYL KETONE ICSC: 1495 3-Buten-2-one Methylene acetone C4H6O Molecular mass: 70.1 ICSC #    1495 CAS #     78-94-4 RTECS # EM9800000 UN #        1251 Types of Hazard/ Exposure Acute Hazards/ Symptoms Prevention First Aid/ Fire Fighting FIRE Highly flammable. NO open flames, NO sparks, and NO smoking. Powder, alcohol-resistant foam, water spray, carbon dioxide . Explosion Vapour/air mixtures are explosive. Closed system, ventilation, explosion-proof electrical equipment and lighting. In case of fire: keep drums, etc., cool by spraying with water. Exposure STRICT HYGIENE!  •Inhalation Burning sensation. Cough. Sore throat. Shortness of breath. Laboured breathing. Headache. Dizziness. Tremor. Symptoms may be delayed (see Notes). Ventilation, local exhaust, or breathing protection. Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.  •Skin MAY BE ABSORBED! Redness. Pain. Skin burns. (Further see Inhalation). Protective gloves. Protective clothing. Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.  •Eyes Causes watering of the eyes. Redness. Pain. Severe deep burns. Face shield, or 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. Abdominal pain. Shock or collapse. (Further see Inhalation). Do not eat, drink, or smoke during work. Wash hands before eating. Rinse mouth. Do NOT induce vomiting. Give plenty of water to drink. Refer for medical attention. Spillage Disposal Storage Packaging & Labelling Remove all 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. Personal protection: chemical protection suit including self-contained breathing apparatus. Fireproof. Cool. Keep in the dark. Separated from strong reducing agents , strong oxidants and strong bases. Store only if stabilized. UN Hazard Class: 6.1 UN Subsidiary Risks: 3 and 8 UN Packing Group: I METHYL VINYL KETONE ICSC: 1495 Important Data Physical State; Appearance: COLOURLESS TO YELLOW LIQUID , WITH PUNGENT ODOUR. Physical Dangers: The vapour is heavier than air and may travel along the ground; distant ignition possible. Vapours are uninhibited and may form polymers and block the vents. Chemical Dangers: The substance polymerize under the influence of peroxides, heat , light and oxidants . Reacts with strong bases , strong reducing agents and strong oxidants . Occupational Exposure Limits: TLV: 0.2 ppm (Ceiling value); (skin); SEN; (ACGIH 2003). MAK: IIb (not established but data is available); skin absorption (H); sensitization of skin (Sh); (DFG 2003). 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 can be reached very quickly on evaporation of this substance at 20°C. Effects of Short-Term Exposure: Lachrymation. The substance is corrosive to the eyes and the skin. Corrosive on ingestion. The vapour is severely irritating to the eyes and the respiratory tract. Inhalation of the substance may cause lung oedema (see Notes). The substance may cause effects on the central nervous system . Effects of Long-Term or Repeated Exposure: Repeated or prolonged contact may cause skin sensitization. Physical Properties Boiling point: 81°C Melting point: -7°C Relative density (water = 1): 0.86 Solubility in water: good Vapour pressure, kPa at 25°C: 11 Relative vapour density (air = 1): 2.4 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.1 Flash point: -7°C c.c. Auto-ignition temperature: 491°C Explosive limits, vol% in air: 2.1-15.6 Octanol/water partition coefficient as log Pow: 0.117 (estimated) Environmental Data N O T E S The occupational exposure limit value should not be exceeded during any part of the working exposure. 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 is therefore essential. An added stabilizer or inhibitor can influence the toxicological properties of this substance, consult an expert. Do NOT take working clothes home. Card has been partly updated in April 2005. See section Occupational Exposure Limits. Transport Emergency Card: TEC (R)-61S1251 NFPA Code: H4; F3; R2; ADDITIONAL INFORMATION ICSC: 1495 METHYL VINYL KETONE (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.