# 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
Exposure Limits | 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] | 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 | UEL: NA | LEL: 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
Personal Protection & Sanitation 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 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 Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having a high-efficiency particulate filter/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]
See also: INTRODUCTION