METHYLTETRAHYDROPHTHALIC ANHYDRIDE ICSC: 1645 Tetrahydromethyl-1,3-isobenzofuranedione MTHPA 1,2,3,6-tetrahydromethylphthalic anhydride 1,3-Isobenzofurandione, 3a,4,7,7a-tetrahydromethyl- C9H10O3 Molecular mass: 166.2 ICSC #    1645 CAS #     26590-20-5 RTECS # I3325000 EC #         607-240-00-0 Types of Hazard/ Exposure Acute Hazards/ Symptoms Prevention First Aid/ Fire Fighting FIRE Combustible. NO open flames. In case of fire in the surroundings: use appropriate extinguishing media. Explosion Exposure AVOID ALL CONTACT!  •Inhalation Cough. Ventilation, local exhaust, or breathing protection. Fresh air, rest.  •Skin Redness. Protective gloves. Protective clothing. Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention if skin irritation occurs  •Eyes Redness. Face shield and eye protection in combination with breathing protection. First rinse with plenty of water (remove contact lenses if easily possible).  •Ingestion Do not eat, drink, or smoke during work. Rinse mouth. Spillage Disposal Storage Packaging & Labelling Chemical protection suit including self-contained breathing apparatus. Collect leaking liquid in covered containers. Note: C Xn symbol R: 41-42/43 S: 2-22-24-26-37/39 Signal: Danger Health haz May cause allergic or asthmatic symptoms or breathing difficulties if inhaled May cause allergic skin reaction METHYLTETRAHYDROPHTHALIC ANHYDRIDE ICSC: 1645 Important Data Physical State; Appearance: OILY LIQUID Physical Dangers: Chemical Dangers: Occupational Exposure Limits: TLV not established. MAK not established. Routes of Exposure: The substance can be absorbed into the body by inhalation. Inhalation Risk: Effects of Short-Term Exposure: Effects of Long-Term or Repeated Exposure: Repeated or prolonged inhalation exposure may cause asthma see notes. The substance may have effects on the skin , resulting in contact urticaria. Physical Properties Boiling point: 124°C Melting point: -29°C Flash point: 350°C Environmental Data N O T E S The symptoms of asthma 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. Anyone who has shown symptoms of asthma due to this substance should avoid all further contact. ADDITIONAL INFORMATION ICSC: 1645 METHYLTETRAHYDROPHTHALIC ANHYDRIDE (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.