# NIOSH Pocket Guide to Chemical Hazards
o-Dichlorobenzene | CAS 95-50-1
C6H4Cl2 | RTECS CZ4500000
Synonyms & Trade Names o-DCB; 1,2-Dichlorobenzene; ortho-Dichlorobenzene; o-Dichlorobenzol | DOT ID & Guide 1591 152
Exposure Limits | NIOSH REL: C 50 ppm (300 mg/m3)
OSHA PEL: C 50 ppm (300 mg/m3)
IDLH 200 ppm | Conversion 1 ppm = 6.01 mg/m3
Physical Description Colorless to pale-yellow liquid with a pleasant, aromatic odor. [herbicide]
MW: 147.0 | BP: 357°F | FRZ: 1°F | Sol: 0.01%
VP: 1 mmHg | IP: 9.06 eV |  | Sp.Gr: 1.30
Fl.P: 151°F | UEL: 9.2% | LEL: 2.2% |
Class IIIA Combustible Liquid: Fl.P. at or above 140°F and below 200°F.
Incompatibilities & Reactivities Strong oxidizers, aluminum, chlorides, acids, acid fumes
Measurement Methods NIOSH 1003; OSHA 7
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 promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 200 ppm: (APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s)/(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)£/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Emergency or planned entry into unknown concentrations or IDLH conditions: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, nose; liver, kidney damage; skin blisters
Target Organs Eyes, skin, respiratory system, liver, kidneys
See also: INTRODUCTION