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Chemical Sampling Information (CSI)
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General Description

Synonyms: Monomethylamine; Anhydrous methylamine

OSHA IMIS Code Number: 1665

Chemical Abstracts Service (CAS) Registry Number: 74-89-5

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: PF6300000; 48632

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN1061 118 Flammable Gas (anhydrous) 1235 132 (aqueous)

NIOSH Pocket Guide to Chemical Hazards, Methylamine: chemical description, physical properties, potentially hazardous incompatibilities, and more

Chemical Description and Physical Properties:

colorless gas with an ammonia-like odor; at low concentrations has a fishy odor; liquid under pressure
molecular weight: 31
boiling point: 21°F
melting point: -136°F

Incompatibilities: Mercury, strong oxidizers

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 10 ppm, 12 mg/m3

Construction Industry: 10 ppm, 12 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 ppm, 6.4 mg/m3 TWA; 15 ppm, 19 mg/m3 STEL

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 ppm TWA

Health Factors

Potential Symptoms: Eye, respiratory system irritation; coughing; skin, mucous membrane burns; dermatitis; conjunctivitis

Health Effects: Irritation-Eye, Nose, Throat, Skin---Moderate (HE15) HISTORY M118 lab 3/82

Affected Organs: Respiratory system, eyes, skin

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Coated XAD-7 tube (80/40 mg sections, 20/50 mesh); Coating is 10% (w/w) NBD-Chloride
    analytical solvent: Tetrahydrofuran
    maximum volume: 10 Liters
    maximum flow rate: 0.2 L/min
    current analytical method: High Performance Liquid Chromatography; HPLC/FLU/VIS
    sampling and analytical error: 0.10
    method reference: 2 (OSHA 40)
    method classification: Fully Validated

Secondary Laboratory Sampling/Analytical Method (SAM2):

  • device: Detector Tube
    company: MSA
    part #: 92115
    range #: 5-80 ppm
    class: Mfg

  • device: Detector Tube
    company: Kitagawa
    part #: 222S
    range #: 1-40 ppm
    class: Mfg

  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A & 1B
    range #: 1.9 ppm @ 3.4 um
    class: Mfg

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