# NIOSH Pocket Guide to Chemical Hazards
Diphenyl | CAS 92-52-4
C6H5C6H5 | RTECS DU8050000
Synonyms & Trade Names Biphenyl, Phenyl benzene | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 1 mg/m3 (0.2 ppm)
OSHA PEL: TWA 1 mg/m3 (0.2 ppm)
IDLH 100 mg/m3 | Conversion 1 ppm = 6.31 mg/m3
Physical Description Colorless to pale-yellow solid with a pleasant, characteristic odor. [fungicide]
MW: 154.2 | BP: 489°F | MLT: 156°F | Sol: Insoluble
VP: 0.005 mmHg | IP: 7.95 eV |  | Sp.Gr: 1.04
Fl.P: 235°F | UEL(311°F): 5.8% | LEL(232°F): 0.6% |
Combustible Solid
Incompatibilities & Reactivities Oxidizers
Measurement Methods NIOSH 2530; OSHA PV2022
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash (molten), Quick drench (molten) | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 10 mg/m3: (APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s) in combination with a dust and mist filter/(APF = 10) Any supplied-air respirator Up to 25 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s) in combination with a dust and mist filter* Up to 50 mg/m3: (APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s) in combination with a high-efficiency particulate filter/(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/(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and organic vapor cartridge(s) in combination with a high-efficiency particulate filter*/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 100 mg/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode 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 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, throat; headache, nausea, lassitude (weakness, exhaustion), numb limbs; liver damage
Target Organs Eyes, respiratory system, liver, central nervous system
See also: INTRODUCTION