1,1-DIMETHYLHYDRAZINE†

Chemical Identification
Chemical Identification
CAS # 57-14-7
Formula
 

C₂H₈N₂

Synonyms
 

dimazine; DMH; UDMH; unsymmetrical dimethylhydrazine

Physical Properties
Physical Properties
Physical description Colorless liquid with an ammonia- or fish-like odor.
Boiling point 147°F Molecular weight 60.1
Freezing point/melting point -72°F Vapor pressure 103 mmHg
Flash point 5°F Vapor density 1.94
Specific gravity 0.79 Ionization potential 8.05 eV
Lower explosive limit (LEL) 2% Upper explosive limit (UEL) 95%
NFPA health rating 4 NFPA fire rating 3
NFPA reactivity rating 1 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.) 0940
Sampling group
Sampler/Sampling media Bubbler (0.1 M hydrochloric acid)
Sampling time*
Sampling volume (TWA)*

2-100 L

Sampling flow rate (TWA)*

0.2-1 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments UV-VIS
Method reference NIOSH 3515 (partially 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 Infrared spectrophotometer
Model/Type Miran 1A & 1B
Sampling information
(see manufacturer instructions)
0.3 ppm@11.2 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
 

0.5 ppm (1 mg/m³)

REL-TWA
 

 

TLV-TWA
 

0.01 ppm [1993]

PEL-TWA
 

0.01 ppm (0.025 mg/m³)

PEL-STEL
 

 

REL-STEL
 

 

TLV-STEL
 

 

PEL-STEL
 

 

PEL-C
 

 

REL-C
 

0.06 ppm (0.15 mg/m³) [120 minutes]

TLV-C
 

 

PEL-C
 

 

Skin notation
 

Y

Skin notation
 

N

Skin notation
 

Y

Skin notation
 

Y

Notes:
 

See 29 CFR 1910.1000 Table Z-1.

Notes:
 

CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION. See Appendix A.

Notes:
 

 

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 

15 ppm

Carcinogenic classifications: IARC-2B, NIOSH-Ca, NTP-R, TLV-A3 Notes:
 

Ca

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

 

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - 1,1-Dimethylhydrazine

NIOSH: Pocket Guide to Chemical Hazards - 1,1-Dimethylhydrazine

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - 1,1-Dimethylhydrazine. See annual publication for most recent information.

Last Updated Date : 01/15/2021