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Styrene																				Related Pages
Synonyms & Trade Names
			Ethenyl benzene, Phenylethylene, Styrene monomer, Styrol, Vinyl benzene
CAS No.
			100-42-5
	RTECS No.
			WL3675000
	DOT ID & Guide
			2055 128P(inhibited)

FormulaC6H5CH=CH2
	Conversion
			1 ppm = 4.26 mg/m3
	IDLH
			700 ppmSee: 100425

Exposure Limits
			NIOSH RELTWA 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) See Appendix G
	Measurement Methods
			**NIOSH** 1501 , 3800;**OSHA** 9 , 89
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless to yellow, oily liquid with a sweet, floral odor.													
										
Molecular Weight104.2	
	Boiling Point293°F
	Freezing Point-23°F
	Solubility0.03%
	Vapor Pressure5 mmHg
	Ionization Potential8.40 eV											
Specific Gravity0.91	
	Flash Point88°F
	Upper Explosive Limit6.8%
	Lower Explosive Limit0.9%
Class IC Flammable Liquid: Fl.P. at or above 73°F and below 100°F.
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.]
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
										
Personal Protection/Sanitation
			(See protection codes) **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 canisterAny appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0073
					  MEDICAL TESTS: 0214

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Chemical Names, Synonyms and Trade Names
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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