Label abbreviations descriptions

METHYL HYDRAZINE (MONOMETHYL HYDRAZINE)†

Chemical Identification
CAS # 60-34-4
Formula
 

CH₆N₂
Synonyms
 

MMH; monomethylhydrazine

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 70°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
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.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)

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

Last Updated Date : 01/22/2024