NIOSH Pocket Guide to Chemical Hazards

1,2,4-Trichlorobenzene CAS 120-82-1
C6H3Cl3 RTECS DC2100000
Synonyms & Trade Names
unsym-Trichlorobenzene; 1,2,4-Trichlorobenzol
DOT ID & Guide
2321 153 (liquid)
NIOSH REL: C 5 ppm (40 mg/m3)
OSHA PEL†: none
IDLH N.D. Conversion 1 ppm = 7.42 mg/m3
Physical Description
Colorless liquid or crystalline solid (below 63°F) with an aromatic odor.
MW: 181.4
BP: 416°F
FRZ: 63°F
Sol: 0.003%
VP: 1 mmHg
IP: ?

Sp.Gr: 1.45
Fl.P: 222°F
UEL(302°F): 6.6%
LEL(302°F): 2.5%

Class IIIB Combustible Liquid
Combustible Solid
Incompatibilities & Reactivities
Acids, acid fumes, oxidizers, steam
Measurement Methods
NIOSH 5517
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, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane; in animals: liver, kidney damage; possible teratogenic effects
Target Organs Eyes, skin, respiratory system, liver, reproductive system