# NIOSH Pocket Guide to Chemical Hazards
Nitrobenzene | CAS 98-95-3
C6H5NO2 | RTECS DA6475000
Synonyms & Trade Names Essence of mirbane, Nitrobenzol, Oil of mirbane | DOT ID & Guide 1662 152
Exposure Limits | NIOSH REL: TWA 1 ppm (5 mg/m3) [skin]
OSHA PEL: TWA 1 ppm (5 mg/m3) [skin]
IDLH 200 ppm | Conversion 1 ppm = 5.04 mg/m3
Physical Description Yellow, oily liquid with a pungent odor like paste shoe polish. [Note: A solid below 42°F.]
MW: 123.1 | BP: 411°F | FRZ: 42°F | Sol: 0.2%
VP(77°F): 0.3 mmHg | IP: 9.92 eV |  | Sp.Gr: 1.20
Fl.P: 190°F | UEL: ? | LEL(200°F): 1.8% |
Class IIIA Combustible Liquid: Fl.P. at or above 140°F and below 200°F.
Incompatibilities & Reactivities Concentrated nitric acid, nitrogen tetroxide, caustics, phosphorus pentachloride, chemically-active metals such as tin or zinc
Measurement Methods NIOSH 2005, 2017
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: No recommendation Remove: When wet or contaminated Change: Daily Provide: Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 10 ppm: (APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)*/(APF = 10) Any supplied-air respirator* Up to 25 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)* Up to 50 ppm: (APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s)/(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and organic vapor cartridge(s)*/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 200 ppm: (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/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin; anoxia; dermatitis; anemia; methemoglobinemia; in animals: liver, kidney damage; testicular effects
Target Organs Eyes, skin, blood, liver, kidneys, cardiovascular system, reproductive system
See also: INTRODUCTION