NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005




Synonyms & Trade Names

p-DCB; 1,4-Dichlorobenzene; para-Dichlorobenzene; Dichlorocide
DOT ID & Guide


NIOSH REL: Ca See Appendix A
OSHA PEL: TWA 75 ppm (450 mg/m3)
Ca [150 ppm] See: 106467
1 ppm = 6.01 mg/m3
Physical Description
Colorless or white crystalline solid with a mothball-like odor. [insecticide]
MW: 147.0
BP: 345°F
MLT: 128°F
Sol: 0.008%
VP: 1.3 mmHg
IP: 8.98 eV

Sp.Gr: 1.25
Fl.P: 150°F
UEL: ?
LEL: 2.5%

Combustible Solid, but may take some effort to ignite.
Incompatibilities & Reactivities

Strong oxidizers (such as chlorine or permanganate)
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/Daily
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Soap wash
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(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
(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
Eye irritation, swelling periorbital (situated around the eye); profuse rhinitis; headache, anorexia, nausea, vomiting; weight loss, jaundice, cirrhosis; in animals: liver, kidney injury; [potential occupational carcinogen]
Target Organs
Liver, respiratory system, eyes, kidneys, skin

Cancer Site
[in animals: liver & kidney cancer]
See also: INTRODUCTION   See ICSC CARD: 0037   See MEDICAL TESTS: 0073