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alpha-Methyl styrene																				Related Pages
Synonyms & Trade Names
			AMS [a-Methyl styrene], Isopropenyl benzene, 1-Methyl-1-phenylethylene, 2-Phenyl propylene
CAS No.
			98-83-9
	RTECS No.
			WL5075300
	DOT ID & Guide

FormulaC6H5C(CH3)=CH2
	Conversion
			1 ppm = 4.83 mg/m3
	IDLH
			700 ppmSee: 98839

Exposure Limits
			NIOSH RELTWA 50 ppm (240 mg/m3) ST 100 ppm (485 mg/m3)
					OSHA PEL C 100 ppm (480 mg/m3) See Appendix G
	Measurement Methods
			**NIOSH** 1501;**OSHA** 7
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless liquid with a characteristic odor.													
										
Molecular Weight118.2	
	Boiling Point330°F
	Freezing Point-10°F
	SolubilityInsoluble
	Vapor Pressure2 mmHg
	Ionization Potential8.35 eV											
Specific Gravity0.91	
	Flash Point129°F
	Upper Explosive Limit6.1%
	Lower Explosive Limit1.9%
Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F.
Incompatibilities & Reactivities
			Oxidizers, peroxides, halogens, catalysts for vinyl or ionic polymers; aluminum, iron chloride, copper
					[Note: Usually contains an inhibitor such as tert-butyl catechol.]
Exposure Routes
			inhalation, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin, nose, throat; drowsiness; dermatitis
Target Organs
			Eyes, skin, respiratory system, central nervous system
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet or contaminated
							**Change:**No recommendation
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Water flush promptly
							**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: 0732
					  MEDICAL TESTS: 0257

			
							

			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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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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