# 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)
Exposure Limits | 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
See also: INTRODUCTION