1,2,4-Trimethylbenzene
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Synonyms & Trade Names
Asymmetrical trimethylbenzene, psi-Cumene, Hemimellitene [1,2,4-Trimethylbenzene], Pseudocumene [Note: Hemimellitene is a mixture of the 1,2,3-isomer with up to 10% of related aromatics such as the 1,2,4-isomer.]Physical Description
Clear, colorless liquid with a distinctive, aromatic odor.Molecular Weight
120.2Boiling Point
337°FFreezing Point
-77°FSolubility
0.006%Vapor Pressure
(56°F): 1 mmHgIonization Potential
8.27 eVSpecific Gravity
0.88Flash Point
112°FUpper Exposive Limit
6.4%Lower Explosive Limit
0.9%
Class II Flammable Liquid
Incompatibilities & Reactivities
Oxidizers, nitric acidExposure Routes
inhalation, ingestion, skin and/or eye contactSymptoms
irritation eyes, skin, nose, throat, respiratory system; bronchitis; hypochromic anemia; headache, drowsiness, lassitude (weakness, exhaustion), dizziness, nausea, incoordination; vomiting, confusion; chemical pneumonitis (aspiration liquid)Target Organs
Eyes, skin, respiratory system, central nervous system, bloodPersonal Protection/Sanitation
(See protection codes)Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet or contaminated
Change:No recommendation
First Aid
(See procedures)Eye:Irrigate immediately
Skin:Soap wash
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations
Not available.
- Page last reviewed:April 11, 2016
- Page last updated:April 11, 2016
- Content source:
- National Institute for Occupational Safety and Health (NIOSH) Education and Information Division