| Physical Description |
N-methyl-2-pyrrolidone appears as a clear colorless liquid with a "fishlike" odor. Denser than water. Flash point 199 °F. Contact may irritate skin, eyes and mucous membranes. May be toxic by ingestion. |
| Color/Form |
Clear liquid |
| Odor |
Mild amine odor |
| Boiling Point |
396 °F at 760 mmHg (NTP, 1992) |
| Melting Point |
-9 °F (NTP, 1992) |
| Flash Point |
204 °F (NTP, 1992) |
| Solubility |
greater than or equal to 100 mg/mL at 68 °F (NTP, 1992) |
| Density |
1.03 at 77 °F (USCG, 1999) - Denser than water; will sink |
| Vapor Density |
3.4 (NTP, 1992) - Heavier than air; will sink (Relative to Air) |
| Vapor Pressure |
0.34 [mmHg] |
| LogP |
log Kow = -0.38 |
| Stability/Shelf Life |
NMP shows unlimited shelf life in tightly closed containers, slight discoloration does not impair its quality. |
| Autoignition Temperature |
655 °F (346 °C) |
| Decomposition |
Decomposes on heating and on burning. This produces toxic fumes including nitrogen oxides and carbon monoxide. |
| Viscosity |
1.65 cP at 25 °C |
| Heat of Combustion |
719 kcal/mol |
| Heat of Vaporization |
127.3 kcal/Kg |
| pH |
pH = 7.7-8 |
| Surface Tension |
40.7 dynes/cm |
| Odor Threshold |
Odor Threshold Low: 4.0 [mmHg] Odor Threshold High: 10.0 [mmHg] Odor thresholds from CSH |
| Refractive Index |
MAX ABSORPTION (METHANOL): 205 NM (LOG E= 3.46); INDEX OF REFRACTION: 1.4684 AT 20 °C/D; SADTLER REFERENCE NUMBER: 6528 (IR, PRISM); 116 (VARIAN, NMR) |
| Kovats Retention Index |
1012 1004.6 1002 1034 1009 |
| Other Experimental Properties |
Dipole moment at 25 °C: 4.09 debye; Dielectric constant at 25 °C: 32.3 |
| Chemical Classes |
Solvents -> Other Solvents |
