1,3,5-TRIMETHYLBENZENE 1155
March 2002
Mesitylene
CAS No: 108-67-8
C9H12
RTECS No: OX6825000
Molecular mass: 120.2
UN No: 2325
EC No: 601-025-00-5
TYPES OF
ACUTE HAZARDS/SYMPTOMS PREVENTION FIRST AID/FIRE FIGHTING
HAZARD/
EXPOSURE
Flammable. NO open flames, NO sparks, and Alcohol-resistant foam, dry powder,
FIRE
NO smoking. carbon dioxide.
Above 50/C explosive vapour/air Above 50/C use a closed system, In case of fire: keep drums, etc.,
EXPLOSION
mixtures may be formed. ventilation, and explosion-proof cool by spraying with water.
electrical equipment. Prevent
build-up of electrostatic charges
(e.g., by grounding).
EXPOSURE PREVENT GENERATION OF
MISTS!
Confusion. Cough. Dizziness. Ventilation, local exhaust, or Fresh air, rest. Refer for medical
Inhalation
Drowsiness. Headache. Sore breathing protection. attention.
throat. Vomiting.
Redness. Dry skin. Protective gloves. Remove contaminated clothes.
Skin
Rinse skin with plenty of water or
shower.
Redness. Pain. Safety spectacles. First rinse with plenty of water for
Eyes
several minutes (remove contact
lenses if easily possible), then take
to a doctor.
(See Inhalation). Do not eat, drink, or smoke during Rinse mouth. Do NOT induce
Ingestion
work. vomiting. Refer for medical
attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Collect leaking and spilled liquid in sealable Xi Symbol Marine pollutant.
containers as far as possible. Absorb remaining N Symbol
liquid in sand or inert absorbent and remove to safe R: 10-37-51/53
place. Do NOT wash away into sewer. Do NOT let S: (2-)61
this chemical enter the environment. Personal UN Hazard Class: 3
protection: filter respirator for organic gases and UN Pack Group: III
vapours.
EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-30S2325 Fireproof. Separated from strong oxidants. Well closed. Keep in a
NFPA Code: H0; F2; R0 well-ventilated room.
IPCS Prepared in the context of cooperation between the International
Programme on Chemical Safety and the European Commission 漏
International IPCS 2005
Programme on
Chemical Safety SEE IMPORTANT INFORMATION ON THE BACK.
1155 1,3,5-TRIMETHYLBENZENE
IMPORTANT DATA
Physical State; Appearance Routes of exposure
COLOURLESS LIQUID, WITH CHARACTERISTIC ODOUR. The substance can be absorbed into the body by inhalation.
Chemical dangers Inhalation risk
The substance decomposes on burning producing toxic and A harmful contamination of the air will be reached rather slowly
irritating fumes. Reacts violently with strong oxidants causing fire on evaporation of this substance at 20/C; on spraying or
and explosion hazard. dispersing, however, much faster.
Occupational exposure limits Effects of short-term exposure
TLV: 25 ppm as TWA; (ACGIH 2004). The substance is irritating to the eyes, the skin and the
MAK: (all isomers) 20 ppm, 100 mg/m3; Peak limitation category: respiratory tract. If this liquid is swallowed, aspiration into the
II(2); Pregnancy risk group: C; (DFG 2004). lungs may result in chemical pneumonitis. The substance may
cause effects on the central nervous system.
Effects of long-term or repeated exposure
The liquid defats the skin. Lungs may be affected by repeated or
prolonged exposure, resulting in chronic bronchitis. The
substance may have effects on the central nervous system and
blood. See Notes.
PHYSICAL PROPERTIES
Boiling point: 165/C Relative vapour density (air = 1): 4.1
Melting point: -45/C Relative density of the vapour/air-mixture at 20/C (air = 1): 1.01
Relative density (water = 1): 0.86 Flash point: 50/C (c.c.)
Solubility in water: very poor Auto-ignition temperature: 550/C
Vapour pressure, kPa at 20/C: 0.25 Octanol/water partition coefficient as log Pow: 3.42
ENVIRONMENTAL DATA
The substance is harmful to aquatic organisms. Bioaccumulation of this chemical may occur in fish.
NOTES
Use of alcoholic beverages enhances the harmful effect.
Depending on the degree of exposure, periodic medical examination is suggested.
See ICSC 1433 1,2,4-Trimethylbenzene (Pseudocumene), ICSC 1362 1,2,3-Trimethylbenzene (Hemimellitene), ICSC 1389
Trimethyl benzene (mixed isomers).
Card has been partly updated in April 2005. See section Occupational Exposure Limits.
ADDITIONAL INFORMATION
Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible
LEGAL NOTICE
漏IPCS 2005
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