# NIOSH Pocket Guide to Chemical Hazards
1,2,3-Trimethylbenzene | CAS 526-73-8
C6H3(CH3)3 | RTECS DC330000
Synonyms & Trade Names Hemellitol [Note: Hemimellite is a mixture of the 1,2,3-isomer with up to 10% of related aromatics such as the 1,2,4-isomer.] | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 25 ppm (125 mg/m3)
OSHA PEL†: none
IDLH N.D. | Conversion 1 ppm = 4.92 mg/m3
Physical Description Clear, colorless liquid with a distinctive, aromatic odor.
MW: 120.2 | BP: 349°F | FRZ: -14°F | Sol: Low
VP(62°F): 1 mmHg | IP: 8.48 eV |  | Sp.Gr: 0.89
Fl.P: ? | UEL: 6.6% | LEL: 0.8% |
Flammable Liquid
Incompatibilities & Reactivities Oxidizers, nitric acid
Measurement Methods None available
Personal Protection & Sanitation 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 To be added later
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms 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, blood
See also: INTRODUCTION