NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

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 See: 95501
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
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
Important additional information about respirator selection
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   See ICSC CARD: 1066   See MEDICAL TESTS: 0255