NIOSH Pocket Guide to Chemical Hazards

Styrene CAS 100-42-5
C6H5CH=CH2 RTECS WL3675000
Synonyms & Trade Names
Ethenyl benzene, Phenylethylene, Styrene monomer, Styrol, Vinyl benzene
DOT ID & Guide
2055 128P (inhibited)
Exposure
Limits
NIOSH REL: TWA 50 ppm (215 mg/m3) ST 100 ppm (425 mg/m3)
OSHA PEL: TWA 100 ppm C 200 ppm 600 ppm (5-minute maximum peak in any 3 hours)
IDLH 700 ppm Conversion 1 ppm = 4.26 mg/m3
Physical Description
Colorless to yellow, oily liquid with a sweet, floral odor.
MW: 104.2
BP: 293°F
FRZ: -23°F
Sol: 0.03%
VP: 5 mmHg
IP: 8.40 eV

Sp.Gr: 0.91
Fl.P: 88°F
UEL: 6.8%
LEL: 0.9%

Class IC Flammable Liquid: Fl.P. at or above 73F and below 100F.
Incompatibilities & Reactivities
Oxidizers, catalysts for vinyl polymers, peroxides, strong acids, aluminum chloride [Note: May polymerize if contaminated or subjected to heat. Usually contains an inhibitor such as tert-butylcatechol.]
Measurement Methods
NIOSH 1501, 3800; OSHA 9, 89
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
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations NIOSH
Up to 500 ppm: (APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)*/(APF = 10) Any supplied-air respirator*
Up to 700 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(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 = 25) Any powered, air-purifying respirator with 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
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, nose, respiratory system; headache, lassitude (weakness, exhaustion), dizziness, confusion, malaise (vague feeling of discomfort), drowsiness, unsteady gait; narcosis; defatting dermatitis; possible liver injury; reproductive effects
Target Organs Eyes, skin, respiratory system, central nervous system, liver, reproductive system
See also: INTRODUCTION