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 | 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 | ||||||
|---|---|---|---|---|---|---|
| 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* |
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| Sampling volume (TWA)* |
240 L |
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| Sampling flow rate (TWA)* |
1 L/min |
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| Sampling volume (STEL/Peak/C)* |
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| Sampling flow rate (STEL/Peak/C)* |
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| 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. |
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| Special requirements |
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* 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 | |
|---|---|
| Sampler/Sampling media |
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| Bulk Method |
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| On-Site Screening Techniques | ||||||
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| Device | ||||||
| Model/Type | ||||||
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Sampling information (see manufacturer instructions) |
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| 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 |
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| 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 |
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PEL-C |
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| Skin notation |
Y |
Skin notation |
N |
Skin notation |
Y |
Skin notation |
Y |
| Notes: |
Notes:
CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION. See Appendix A, NIOSH Potential Occupational Carcinogens. |
Notes:
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Notes:
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| Health factors: See NIH-NLM PubChem. | IDLH |
20 ppm |
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| Carcinogenic classifications: NIOSH-Ca, TLV-A3 |
Notes:
Ca |
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
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| Additional Resources and Literature References |
|---|
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NOAA: CAMEO Chemicals - Methylhydrazine NIOSH: Pocket Guide to Chemical Hazards - Methyl hydrazine Literature References
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Last Updated Date : 01/28/2021