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
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 140F and below 200F.
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