Benzene, trimethyl (isomers)
Methylxylene
C9H12
Molecular mass: 120.2
ICSC # 1389
CAS # 25551-13-7
RTECS # DC3220000
UN # 1993
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Flammable.
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NO open flames, NO sparks, and NO smoking.
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Alcohol-resistant foam,
dry powder,
carbon dioxide.
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Explosion
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Above 44°C explosive vapour/air mixtures may be formed.
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Above 44°C use a closed system, ventilation, and explosion-proof electrical equipment.
Prevent build-up of electrostatic charges (e.g., by grounding).
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In case of fire: keep drums, etc., cool by spraying with water.
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Exposure
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PREVENT GENERATION OF MISTS!
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•Inhalation
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Confusion.
Cough.
Dizziness.
Drowsiness.
Headache.
Sore throat.
Vomiting.
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Ventilation, local exhaust, or breathing protection.
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Fresh air, rest.
Refer for medical attention.
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•Skin
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Redness.
Dry skin.
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Protective gloves.
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Remove contaminated clothes.
Rinse skin with plenty of water or shower.
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•Eyes
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Redness.
Pain.
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Safety spectacles.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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(See Inhalation).
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Do not eat, drink, or smoke during work.
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Rinse mouth.
Do NOT induce vomiting.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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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.
Do NOT wash away into sewer.
Do NOT let this chemical enter the environment.
Personal protection:
filter respirator for organic gases and vapours.
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Fireproof.
Separated from
strong oxidants.
Well closed.
Keep in a well-ventilated room.
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See Notes.
UN Hazard Class: 3
UN Packing Group: III
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Important Data
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Physical State; Appearance:
COLOURLESS LIQUID
, WITH CHARACTERISITC ODOUR.
Physical Dangers:
Chemical Dangers:
The substance decomposes
on burning
producing toxic and
irritating fumes
.
Reacts
violently with
strong oxidants
causing fire and explosion hazard.
Occupational Exposure Limits:
TLV: (as mixed isomers) 25 ppm as TWA; (ACGIH 2008).
EU OEL: (all isomers) 20 ppm, 100 mg/m3 as TWA (EU 2001).
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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; on spraying or dispersing, however, much faster.
Effects of Short-Term Exposure:
The substance
is irritating to
the eyes
,
the skin
and
the respiratory tract
.
If this liquid is swallowed, aspiration into the 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
blood
and
central nervous system
.
See Notes.
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Physical
Properties
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Boiling point: 165 to 176°C
Melting point: -25 to 45°C
Relative density (water = 1): 0.86 to 0.89
Solubility in water:
very poor
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Vapour pressure, kPa at 20°C: 0.18 to 0.25
Relative vapour density (air = 1): 4.1
Flash point: 44 to 53°C (c.c.)
Auto-ignition temperature: 470 to 550°C
Octanol/water partition coefficient as log Pow: 3.4 to 3.8
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Environmental
Data
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The substance is harmful to aquatic organisms.
Bioaccumulation of this chemical may occur in fish.
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N O T E S
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Use of alcoholic beverages enhances the harmful effect.
Depending on the degree of exposure, periodic medical examination is indicated.
See ICSC 1155 1,3,5-Trimethylbenzene (Mesitylene); ICSC 1362 1,2,3-Trimethylbenzene (Hemimellitene); ICSC 1433 1,2,4-Trimethylbenzene (Pseudocumene).
1,3,5-Trimethylbenzene (Mesitylene) is classified as a marine pollutant.
Transport Emergency Card: TEC (R)-30GF1-III
NFPA Code: H0; F2; R0;
Card has been partially updated in February 2009: see Occupational Exposure Limits.
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ADDITIONAL INFORMATION
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ICSC: 1389
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TRIMETHYL BENZENE (MIXED ISOMERS)
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(C) IPCS, CEC, 1994
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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.
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