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1,2,3-TRIMETHYLBENZENE ICSC: 1362
Date of Peer Review: March 2001

Hemimellitene
CAS # 526-73-8 C9H12
RTECS # DC3300000 Molecular mass: 120.2
UN # 1993
EC #
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 44C explosive vapour/air mixtures may be formed.
Above 44C 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 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.
EU Classification
UN Classification
UN Hazard Class: 3
UN Pack Group: III
EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-30GF1-III
NFPA Code: H0; F2; R0;
Fireproof. Well closed. Separated from oxidants.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2004

SEE IMPORTANT INFORMATION ON BACK


1,2,3-TRIMETHYLBENZENE ICSC: 1362
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID, WITH CHARACTERISTIC ODOUR.

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/m; 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 20C.

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.

PHYSICAL PROPERTIES
Boiling point: 176C
Melting point: -25C
Density: 0.89 g/cm
Solubility in water, g/100 ml: 0.005
Vapour pressure, kPa at 20C: 0.18
Relative vapour density (air = 1): 4.1
Relative density of the vapour/air-mixture at 20C (air = 1): 1.01
Flash point: 44C
Auto-ignition temperature: 470C
Explosive limits, vol% in air: 0.8-6.6
Octanol/water partition coefficient as log Pow: 3.7
ENVIRONMENTAL DATA

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


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2004