1. OSHA Occupational Chemical Database
  2. METHYLAMINE
Label abbreviations descriptions

METHYLAMINE†

Chemical Identification
Chemical Identification
CAS # 74-89-5
Formula
 

CH₅N
Synonyms
 

aminomethane; methylamine (anhydrous); methylamine (aqueous); monomethylamine
Physical Properties
Physical Properties
Physical description Colorless gas with a fish- or ammonia-like odor.
Boiling point 20.3°F Molecular weight 31.1
Freezing point/melting point -136°F Vapor pressure 3.0 atm
Flash point Vapor density 1.08
Specific gravity 0.693 at 20.3°F Ionization potential 8.97 eV
Lower explosive limit (LEL) 4.9% Upper explosive limit (UEL) 20.7%
NFPA health rating 3 NFPA fire rating 4
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1665
Sampling group
Sampler/Sampling media XAD-7 tube (80/40 mg) coated with 10% NBD chloride [SKC 226-96]
Sampling time*
 

50 min
Sampling volume (TWA)*
 

10 L
Sampling flow rate (TWA)*
 

0.2 L/min
Sampling volume (STEL/Peak/C)*
 
 

 
Sampling flow rate (STEL/Peak/C)*
 
 

 
Analytical method instruments HPLC
Method reference OSHA 40 (fully validated)
Notes
 
 

 
Special requirements
 
 

 

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
 
 

 
Bulk Method
Bulk Method
 
 

 
On-Site Screening Techniques
On-Site Screening Techniques
Device Detector tube Infrared spectrophotometer
Model/Type Matheson-Kitagawa 8014-222S Miran 1A & 1B
Sampling information
(see manufacturer instructions) 		1-40 ppm range 1.9 ppm@3.4 µm
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 
 

10 ppm (12 mg/m³)

 REL-TWA
 
 

10 ppm (12 mg/m³)

 TLV-TWA
 
 

5 ppm [2012]

 PEL-TWA
 
 

5 ppm (6.4 mg/m³)
PEL-STEL
 
 

 

 REL-STEL
 
 

 

 TLV-STEL
 
 

15 ppm [2012]

 PEL-STEL
 
 

15 ppm (19 mg/m³)
PEL-C
 
 

 

 REL-C
 
 

 

 TLV-C
 
 

 

 PEL-C
 
 

 
Skin notation
 
 

N

 Skin notation
 
 

N

 Skin notation
 
 

N

 Skin notation
 
 

N
Notes:
 
 

See 29 CFR 1910.1000 Table Z-1.

 Notes:
 
 

 

 Notes:
 
 

 

 Notes:
 
 

 
Health factors:  See NIH-NLM PubChem. IDLH
 
 

100 ppm
Carcinogenic classifications: Not listed Notes:
 
 

 
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 
 

10 ppm/100 ppm/500 ppm
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Methylamine, anhydrous

NIOSH: Pocket Guide to Chemical Hazards - Methylamine

Literature References

 
 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Methylamine. See annual publication for most recent information.

Last Updated Date : 01/29/2021