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1,2,3-TRIMETHYLBENZENE
ICSC: 1362
Peer-Review Status: 03.11.2001 Validated
Hemimellitene 
CAS #: 526-73-8 RTECS #: DC3300000
UN #: 1993
EINECS #: 208-394-8
    Formula: C9H12
Molecular mass: 120.2

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Flammable.  NO open flames, NO sparks and NO smoking.  Use 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.  Use 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.  Wear safety spectacles.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion   Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Collect leaking and spilled liquid in covered containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Do NOT wash away into sewer.   
EC Classification
 
UN Classification
UN Hazard Class: 3; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-30GF1-III.
NFPA Code: H0; F2; R0. 
Fireproof. Well closed. Separated from oxidants. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
 

Chemical dangers
Reacts with oxidants. This generates fire and explosion hazard. 

Occupational exposure limits
TLV: 25ppm as TWA; (ACGIH 2004).
MAK: 20 ppm, 100 mg/m³; Peak limitation category: II(2); Pregnancy risk group: C; (DFG 2004). 

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, skin and 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 ENVIRONMENTAL DATA
Boiling point: 176°C
Melting point: -25°C
Density: 0.89 g/cm³
Solubility in water, g/100ml: 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  
 

NOTES
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. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations