International Chemical Safety Cards 1,2,3-TRIMETHYLBENZENE ICSC: 1362 Hemimellitene C9H12 Molecular mass: 120.2 ICSC #    1362 CAS #     526-73-8 RTECS # DC3300000 UN #        1993 March 11, 2001 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Flammable. NO open flames, NO sparks, and NO smoking. Alcohol-resistant foam, foam, powder, carbon dioxide. EXPLOSION Above 44°C explosive vapour/air mixtures may be formed. Above 44°C use a closed system, ventilation, and explosion-proof electrical equipment. Prevent build-up of electrostatic charges (e.g., by grounding). In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE PREVENT GENERATION OF MISTS!  •INHALATION Confusion. Dizziness. Headache. Vomiting. Drowsiness. Cough. Sore throat. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Refer for medical attention.  •SKIN Redness. Protective gloves. Rinse skin with plenty of water or shower.  •EYES Redness. Pain. 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. Do NOT induce vomiting. Refer for medical attention. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Collect leaking liquid in covered containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. Fireproof. Well closed. Separated from oxidants . R: S: UN Hazard Class: 3 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 1362 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 1,2,3-TRIMETHYLBENZENE ICSC: 1362 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS LIQUID , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: CHEMICAL DANGERS: Reacts with oxidants causing fire and explosion hazard. OCCUPATIONAL EXPOSURE LIMITS: TLV: 25 ppm as TWA; (ACGIH 2004). MAK: 20 ppm, 100 mg/m³; Peak limitation category: II(2); Pregnancy risk group: C; (DFG 2004). OSHA PEL: none NIOSH REL: TWA 25 ppm (125 mg/m3) NIOSH IDLH: No data ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation. INHALATION RISK: A harmful contamination of the air will be reached rather slowly on evaporation of this substance at 20°C. EFFECTS OF SHORT-TERM EXPOSURE: The substance is irritating to the eyes , the skin and the respiratory tract . The substance may cause effects on the central nervous system . If this liquid is swallowed, aspiration into the lungs may result in chemical pneumonitis. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: 176°C Melting point: -25°C Density: 0.89 g/cm3 Solubility in water, g/100 ml: 0.005 Vapour pressure, kPa at 20°C: 0.18 Relative vapour density (air = 1): 4.1 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.01 Flash point: 44°C Auto-ignition temperature: 470°C Explosive limits, vol% in air: 0.8-6.6 Octanol/water partition coefficient as log Pow: 3.7 ENVIRONMENTAL DATA N O T E S Use of alcoholic beverages enhances the harmful effect. See also ICSC1155 Mesitylene, 1389 Trimethyl benzene (mixed isomers). Card has been partly updated in April 2005. See sections Occupational Exposure Limits, Emergency Response. Transport Emergency Card: TEC (R)-30GF1-III NFPA Code: H0; F2; R0; ADDITIONAL INFORMATION ICSC: 1362 1,2,3-TRIMETHYLBENZENE (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.