DIMETHYLAMINE (ANHYDROUS)†

Chemical Identification
Chemical Identification
CAS # 124-40-3
Formula

C₂H₇N

Synonyms

N-methylmethanamine

Physical Properties
Physical Properties
Physical description Colorless gas with an ammonia- or fish-like odor.
Boiling point 44°F Molecular weight 45.1
Freezing point/melting point -134°F Vapor pressure 1.7 atm
Flash point 20°F (liquid) Vapor density 1.56
Specific gravity 0.67 (liquid at 44°F) Ionization potential 8.24 eV
Lower explosive limit (LEL) 2.8% Upper explosive limit (UEL) 14.4%
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.) 0928
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 34 (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 Gastec 180 Miran 1A & 1B
Sampling information
(see manufacturer instructions)
1-60 ppm range 1.2 ppm@8.8 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 (18 mg/m³)

REL-TWA

10 ppm (18 mg/m³)

TLV-TWA

5 ppm [2013]

PEL-TWA

5 ppm (9.2 mg/m³)

PEL-STEL REL-STEL TLV-STEL

15 ppm [2013]

PEL-STEL

15 ppm (27.6 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:

dermal sensitizer (DSEN)

Notes:
Health factors:  See NIH-NLM PubChem. IDLH

500 ppm

Carcinogenic classifications: TLV-A4 Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

0.6 ppm/100 ppm/350 ppm

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Dimethylamine, anhydrous

NIOSH: Pocket Guide to Chemical Hazards - Dimethylamine

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Dimethylamine. See annual publication for most recent information.
  • Occupational Health Guidelines for Chemical Hazards. US Department of Health and Human Services (DHHS), National Institute for Occupational Safety and Health (NIOSH) Publication No. 81-123, (1981, January). Provides a table of contents of guidelines for many hazardous chemicals. The files provide technical chemical information, including chemical and physical properties, health effects, exposure limits, and recommendations for medical monitoring, personal protective equipment (PPE), and control procedures.

Last Updated Date : 12/28/2020