CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Methylhydrazine appears as a colorless liquid with an ammonia-like odor. Flash point below 75 °F. Spontaneous ignition may occur in contact with oxidizing materials. Very toxic by inhalation and by skin absorption. Produces toxic oxides of nitrogen during combustion. Rate of onset: Immediate Persistence: Hours - days Odor threshold: 1-10 ppm Source/use/other hazard: Solvent, rocket fuel; flammable; irritating to skin/eyes. |
|---|---|
| Color/Form | Clear liquid |
| Odor | Odor characteristic of short chain, organic amines |
| Boiling Point | 190 °F at 760 mmHg (EPA, 1998) |
| Melting Point | -62.3 °F (EPA, 1998) |
| Flash Point | 158 °F (EPA, 1998) |
| Solubility | Insoluble (<1 mg/ml at 75 °F) (NTP, 1992) |
| Density | 0.874 at 77 °F (EPA, 1998) - Less dense than water; will float |
| Vapor Density | 1.6 (EPA, 1998) - Heavier than air; will sink (Relative to Air) |
| Vapor Pressure | 49.6 mmHg at 77 °F (EPA, 1998) |
| LogP | log Kow= -1.05 |
| Henry's Law Constant | Henry's Law constant: 3X10-6 atm-cu m/mol at 25 °C /Estimated/ |
| Autoignition Temperature | 382 °F (USCG, 1999) |
| Decomposition | When heated to decomposition it emits toxic fumes of /nitrogen oxide/. |
| Viscosity | 0.775 cP at 25 °C |
| Heat of Combustion | -1304.2 kJ/mol |
| Heat of Vaporization | 37.212 kJ/mol |
| pH | Mildly alkaline base |
| Surface Tension | 33.83 dynes/cm |
| Ionization Potential | 8.00 eV |
| Odor Threshold | Odor Threshold Low: 1.7 [mmHg] [NRC 1985] Odor threshold from CHEMINFO |
| Refractive Index | Index of refraction: 1.4325 @ 20 °C/d |
| Dissociation Constants | pKa = 7.87 (conjugate acid) |
| Kovats Retention Index | 1479 1479 |
| Other Experimental Properties | CONVERSION FACTORS: 1 MG/L= 532 PPM; 1 PPM= 1.88 MG/CU M |
| Chemical Classes | Toxic Gases & Vapors -> Other Toxic Gases & Vapors |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Corrosion Corrosives GHS05  Skull and Crossbones Acute Toxicity GHS06  Health Hazard GHS08  Environment GHS09 |
| GHS Hazard Statements |
H225:Flammable liquids H314:Skin corrosion/irritation H350:Carcinogenicity H410:Hazardous to the aquatic environment, long-term hazard |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
COMPUTED DESCRIPTORS
| Molecular Weight | 46.072 g/mol |
|---|---|
| XLogP3 | -0.9 |
| Hydrogen Bond Donor Count | 2 |
| Hydrogen Bond Acceptor Count | 2 |
| Rotatable Bond Count | 0 |
| Exact Mass | 46.053098200 g/mol |
| Monoisotopic Mass | 46.053098200 g/mol |
| Topological Polar Surface Area | 38 Ų |
| Heavy Atom Count | 3 |
| Formal Charge | 0 |
| Complexity | 2.8 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Methylhydrazine appears as a colorless liquid with an ammonia-like odor. Flash point below 75 °F. Spontaneous ignition may occur in contact with oxidizing materials. Very toxic by inhalation and by skin absorption. Produces toxic oxides of nitrogen during combustion. Rate of onset: Immediate Persistence: Hours - days Odor threshold: 1-10 ppm Source/use/other hazard: Solvent, rocket fuel; flammable; irritating to skin/eyes.