N-methylpyrrolidone, NMP; 1- methyl -2 pyrrolidone; N- methyl -2- pyrrolidone. Colorless transparent oily liquid with a slight amine odor. Low volatility, thermal stability, chemical stability are good, can evaporate with steam. It has hygroscopicity. Sensitive to light. Soluble in water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene, it can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymers. N-methylpyrrolidone is widely used in lithium electricity, medicine, pesticides, pigments, cleaning agents, insulation materials and other industries. CAS no. 872-50-4 melting point -24 °C boiling point 203 °C, 81-82 °C/10 mmHg water-soluble soluble soluble water density 1.028 externally colorless transparent oily liquid flash point 91 °C should be used in chemical lithium ion battery production safety description can lead to infertility

1. Properties: colorless, transparent, oily liquid with slight amine odor.

2. Density (g/mL,25/25℃) : 1.0260

3. Relative steam density (g/mL, air =1) : 3.4

Melting point (° C) : -24.4

Boiling point (° C, normal pressure) : 204

6. Boiling point (1.87kPa) : 84.5

7. Refractive index (25 ° C) : 1.468

8. Viscosity (mPa·s) : 1.65

Flash point (° C) : 95

10. Ignition point (° C) : 346

11. Heat of evaporation (KJ/kg,b.p.) : 439.5