International Chemical Safety Cards MESITYLENE ICSC: 1155 MESITYLENE 1,3,5-Trimethylbenzene sym-Trimethylbenzene Trimethylbenzol C9H12/C6H3(CH3)3 Molecular mass: 120.2 CAS # 108-67-8 RTECS # OX6825000 ICSC # 1155 UN # 2325 EC # 601-025-00-5 TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Flammable. NO open flames, NO sparks, and NO smoking. Powder, AFFF, foam, 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! IN ALL CASES CONSULT A DOCTOR! INHALATION Cough. Drowsiness. Headache. Sore throat. Weakness. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Half-upright position. Refer for medical attention. SKIN Dry skin. Protective gloves. Remove contaminated clothes. Rinse skin with plenty of water or shower. EYES Safety spectacles. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor. INGESTION (further see Inhalation). 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 and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Fireproof. Separated from strong oxidants. Xi symbol R: 10-37 S: (2) UN Hazard Class: 3 UN Packing Group: III SEE IMPORTANT INFORMATION ON BACK ICSC: 1155 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 MESITYLENE ICSC: 1155 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS LIQUID , WITH CHARACTERISTIC ODOUR. PHYSICAL DANGERS: As a result of flow, agitation, etc., electrostatic charges can be generated. CHEMICAL DANGERS: Reacts violently with strong oxidants causing fire and explosion hazard. OCCUPATIONAL EXPOSURE LIMITS (OELs): TLV: 25 ppm; 125 mg/m3 (ACGIH 1993-1994). 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 and through the skin. INHALATION RISK: A harmful contamination of the air will be reached rather slowly on evaporation of this substance at 20°C; on spraying or dispersing, however, much faster. EFFECTS OF SHORT-TERM EXPOSURE: The substance irritates the respiratory tract. Swallowing the liquid may cause aspiration into the lungs with the risk of chemical pneumonitis. The substance may cause effects on the central nervous system , resulting in depression. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: The liquid defats the skin. The substance may have effects on the liver and blood , resulting in lesions of blood cells, anaemia, and impaired functions. See notes. PHYSICAL PROPERTIES Boiling point: 165°C Melting point: -45°C Relative density (water = 1): 0.86 Solubility in water: none Vapour pressure, kPa at 20°C: 0.25 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 c.c. Auto-ignition temperature: 550°C Octanol/water partition coefficient as log Pow: 3.42 ENVIRONMENTAL DATA The substance is harmful to aquatic organisms. N O T E S Explosive limits are unknown in literature, although the substance is combustible and has a flash point < 55°C. Use of alcoholic beverages enhances the harmful effect. Depending on the degree of exposure, periodic medical examination is indicated. Insufficient data are available on the effect of this substance on human health, therefore utmost care must be taken. The relation between odour and the occupational exposure limit cannot be indicated. Fleet-X is a trade name. Transport Emergency Card: TEC (R)-577 NFPA Code: H0; F2; R0 ADDITIONAL INFORMATION ICSC: 1155 MESITYLENE © 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.