Hemimellitene
C9H12
Molecular mass: 120.2
ICSC # 1362
CAS # 526-73-8
RTECS # DC3300000
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,
foam,
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.
Dizziness.
Headache.
Vomiting.
Drowsiness.
Cough.
Sore throat.
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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.
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Protective gloves.
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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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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 liquid in covered containers.
Absorb remaining liquid in sand or inert absorbent and remove to safe place.
Do NOT wash away into sewer.
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Fireproof.
Well closed.
Separated from
oxidants
.
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UN Hazard Class: 3
UN Packing Group: III
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Important Data
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Physical State; Appearance:
COLOURLESS LIQUID
, WITH CHARACTERISTIC ODOUR.
Physical Dangers:
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/m3
Peak limitation category: II(2); Pregnancy risk group: C;
(DFG 2004).
OSHA PEL: none
NIOSH REL: TWA 25 ppm (125 mg/m3)
NIOSH IDLH: N.D. See: IDLH INDEX
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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.
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.
Effects of Long-Term or Repeated Exposure:
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Physical
Properties
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Boiling point: 176°C
Melting point: -25°C
Density: 0.89
g/cm3
Solubility in water, g/100 ml: 0.005
Vapour pressure, kPa at 20°C: 0.18
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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
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Environmental
Data
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N O T E S
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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.
Transport Emergency Card: TEC (R)-30GF1-III
NFPA Code: H0; F2; R0;
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ADDITIONAL INFORMATION
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ICSC: 1362
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1,2,3-TRIMETHYLBENZENE
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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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