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        The National Institute for Occupational Safety and Health (NIOSH)
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          The National Institute for Occupational Safety and Health (NIOSH)
         1. NIOSH Pocket Guide to Chemical Hazards
      alpha-Methyl styrene
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        alpha-Methyl styrene
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                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
                Formula
                  C₆H₅C(CH₃)=CH₂
                Conversion
                  1 ppm = 4.83 mg/m3
                IDLH
                  700 ppm
                  See: 98839
                Exposure Limits
                  NIOSH REL
                  TWA 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 Weight
                  118.2
                Boiling Point
                  330°F
                Freezing Point
                  -10°F
                Solubility
                  Insoluble
                Vapor Pressure
                  2 mmHg
                Ionization Potential
                  8.35 eV
                Specific Gravity
                  0.91
                Flash Point
                  129°F
                Upper Explosive Limit
                  6.1%
                Lower Explosive Limit
                  1.9%
                  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 canister
                Any 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
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      NIOSH Pocket Guide to Chemical Hazards
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      * CAS Numbers
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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
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