alpha-Methyl styrene
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CAS
98-83-9
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C6H5C(CH3)=CH2
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RTECS
WL5075300
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Synonyms & Trade Names
AMS, Isopropenyl benzene, 1-Methyl-1-phenylethylene, 2-Phenyl propylene
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DOT ID & Guide
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Exposure
Limits
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NIOSH REL: TWA 50 ppm (240 mg/m3) ST 100 ppm (485 mg/m3)
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OSHA PEL†: C 100 ppm (480 mg/m3)
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IDLH
700 ppm
See: 98839
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Conversion
1 ppm = 4.83 mg/m3
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Physical Description
Colorless liquid with a characteristic odor.
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MW: 118.2
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BP: 330°F
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FRZ: -10°F
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Sol: Insoluble
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VP: 2 mmHg
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IP: 8.35 eV
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Sp.Gr: 0.91
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Fl.P: 129°F
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UEL: 6.1%
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LEL: 1.9%
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Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F.
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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.]
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Measurement Methods
NIOSH 1501; OSHA 7
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
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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
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin, nose, throat; drowsiness; dermatitis
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Target Organs
Eyes, skin, respiratory system, central nervous system
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See also: INTRODUCTION
See ICSC CARD: 0732 See MEDICAL TESTS: 0257
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