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Chemical Sampling Information (CSI)
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General Description

Synonyms: 1-Methyl-1-phenylethylene; AMS

OSHA IMIS Code Number: 1782

Chemical Abstracts Service (CAS) Registry Number: 98-83-9

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: WL5250000; 79131

Chemical Description and Physical Properties:

colorless liquid with a characteristic odor
molecular weight: 118
vapor pressure: 1.9 mm
boiling point: 329°F
melting point: -9°F

Incompatibilities: Oxidizers, peroxides, halogens, catalysts for vinyl or ionic polymers; aluminum, iron chloride

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 100 ppm, 480 mg/m3 Ceiling

Construction Industry: 100 ppm, 480 mg/m3 Ceiling

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 50 ppm, 242 mg/m3 TWA; 100 ppm, 483 mg/m3 STEL

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 50 ppm TWA, 100 ppm STEL

Health Factors

Potential Symptoms: Eye, nose, throat irritation; drowsiness; dermatitis

Health Effects: Irritation-Eyes, Nose, Throat---Mild (HE15) CNS effects (HE7); Narcosis (HE8)

Affected Organs: Eyes, respiratory system, skin

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Charcoal Tube (100/50 mg sections, 20/40 mesh)
    analytical solvent: Carbon Disulfide
    maximum volume: 3 Liters
    maximum flow rate: 0.2 L/min (STEL)
    minimum time: 15 Minutes
    maximum flow rate: 0.2 L/min (Ceiling)
    current analytical method: Gas Chromatography; GC/FID
    method reference: 1 (NIOSH 1501 [134 KB PDF 7 pages])
    sampling and analytical error: 0.09
    method classification: Partially Validated

Secondary Laboratory Sampling/Analytical Method (SAM2):

  • device: Detector Tube
    company: Kitagawa
    part #: 193S
    range: 10-500 ppm
    class: Mfg

    device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A & 1B
    range: 0.7 ppm @ 11.3 um
    class: Mfg

    device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 103
    range: 0-100 ppm @ 11.3 um
    class: Mfg

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