NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Chlorodiphenyl (54% chlorine)


C6H3Cl2C6H2Cl3 (approx)

Synonyms & Trade Names

Aroclor® 1254, PCB, Polychlorinated biphenyl
DOT ID & Guide
2315 / 171


NIOSH REL*: Ca TWA 0.001 mg/m3 See Appendix A [*Note: The REL also applies to other PCBs.]
OSHA PEL: TWA 0.5 mg/m3 [skin]
Ca [5 mg/m3] See: IDLH INDEX
Physical Description
Colorless to pale-yellow, viscous liquid or solid (below 50°F) with a mild, hydrocarbon odor.
MW: 326 (approx)
BP: 689-734°F
FRZ: 50°F
Sol: Insoluble
VP: 0.00006 mmHg
IP: ?

Sp.Gr(77°F): 1.38
Fl.P: NA

Nonflammable Liquid, but exposure in a fire results in the formation of a black soot containing PCBs, polychlorinated dibenzofurans, and chlorinated dibenzo-p-dioxins.
Incompatibilities & Reactivities

Strong oxidizers
Measurement Methods
NIOSH 5503; OSHA PV2088
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: Daily
Provide: Eyewash, Quick drench
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
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 having an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./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
Irritation eyes, chloracne; liver damage; reproductive effects; [potential occupational carcinogen]
Target Organs
Skin, eyes, liver, reproductive system

Cancer Site
[in animals: tumors of the pituitary gland & liver, leukemia]
See also: INTRODUCTION   See ICSC CARD: 0939   See MEDICAL TESTS: 0176