METHYL HYDRAZINE (MONOMETHYL HYDRAZINE)†

Chemical Identification
Chemical Identification
CAS # 60-34-4
Formula
 

CH₆N₂

Synonyms
 

MMH; monomethylhydrazine

Physical Properties
Physical Properties
Physical description Fuming, colorless liquid with an ammonia-like odor.
Boiling point 190°F Molecular weight 46.07
Freezing point/melting point -62.3°F Vapor pressure 38 mmHg
Flash point 158°F Vapor density 1.6
Specific gravity 0.874 at 77°F Ionization potential 8.00 eV
Lower explosive limit (LEL) 2.5% Upper explosive limit (UEL) 97%
NFPA health rating 4 NFPA fire rating 3
NFPA reactivity rating 2 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.) 1794
Sampling group
Sampler/Sampling media 2 GFFs (37 mm) coated with sulfuric acid, in 3-piece cassette, separated by the ring section [SKC 225-9004]
Sampling time*
 

 

Sampling volume (TWA)*
 

240 L

Sampling flow rate (TWA)*
 

1 L/min

Sampling volume (STEL/Peak/C)*
 

 

Sampling flow rate (STEL/Peak/C)*
 

 

Analytical method instruments HPLC
Method reference OSHA 108 (fully validated)
Notes
 

The 2 filters are separated by the ring section of the 3-piece cassette to provide a backup portion to the sampling train.

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
Model/Type
Sampling information
(see manufacturer instructions)
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
 

 

REL-TWA
 

 

TLV-TWA
 

0.01 ppm [1991]

PEL-TWA
 

0.01 ppm (0.019 mg/m³)

PEL-STEL
 

 

REL-STEL
 

 

TLV-STEL
 

 

PEL-STEL
 

 

PEL-C
 

0.2 ppm (0.35 mg/m³)

REL-C
 

0.04 ppm (0.08 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, NIOSH Potential Occupational Carcinogens.

Notes:
 

 

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 

20 ppm

Carcinogenic classifications: NIOSH-Ca, 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 - Methylhydrazine

NIOSH: Pocket Guide to Chemical Hazards - Methyl hydrazine

Literature References

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

Last Updated Date : 01/28/2021