NIOSH Pocket Guide to Chemical Hazards

Chlorodiphenyl (42% chlorine)

CAS 53469-21-9

C6H4ClC6H3Cl2 (approx)

RTECS TQ1356000
Synonyms & Trade Names
Aroclor® 1242, 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 1 mg/m3 [skin]
IDLH Ca [5 mg/m3] See: 53469219 Conversion
Physical Description
Colorless to light-colored, viscous liquid with a mild, hydrocarbon odor.
MW: 258 (approx)
BP: 617-691°F
FRZ: -2°F
Sol: Insoluble
VP: 0.001 mmHg
IP: ?

Sp.Gr(77°F): 1.39
Fl.P: NA

Nonflammable Liquid, but exposure in a fire results in the formation of a black soot containing PCBs, polychlorinated dibenzofurans & chlorinated dibenzo-p-dioxins.
Incompatibilities & Reactivities
Strong oxidizers
Measurement Methods
NIOSH 5503; PV2089
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
Important additional information about respirator selection
Respirator Recommendations NIOSH
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
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms 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]