# NIOSH Pocket Guide to Chemical Hazards
Ethyl benzene | CAS 100-41-4
CH3CH2C6H5 | RTECS DA0700000
Synonyms & Trade Names Ethylbenzol, Phenylethane | DOT ID & Guide 1175 129
Exposure Limits | NIOSH REL: TWA 100 ppm (435 mg/m3) ST 125 ppm (545 mg/m3)
OSHA PEL†: TWA 100 ppm (435 mg/m3)
IDLH 800 ppm [10%LEL] | Conversion 1 ppm = 4.34 mg/m3
Physical Description Colorless liquid with an aromatic odor.
MW: 106.2 | BP: 277°F | FRZ: -139°F | Sol: 0.01%
VP: 7 mmHg | IP: 8.76 eV |  | Sp.Gr: 0.87
Fl.P: 55°F | UEL: 6.7% | LEL: 0.8% |
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities Strong oxidizers
Measurement Methods NIOSH 1501; OSHA 7, 1002
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 800 ppm: (APF = 10) Any chemical cartridge respirator with 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 = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)*/(APF = 10) Any supplied-air respirator*/(APF = 50) Any self-contained breathing apparatus with a full facepiece 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, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane; headache; dermatitis; narcosis, coma
Target Organs Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION