Solvents
REACH
n-methyl-2-pyrrolidone
CAS Number
872-50-4
EC Number
212-828-1
Abbreviation
NMP
What is n-methyl-2-pyrrolidone?
N-Methyl-2-Pyrrolidone (CAS 872-50-4), abbreviated NMP, is a high-boiling polar aprotic solvent.
Where is n-methyl-2-pyrrolidone used?
- Lithium-ion batteries: standard solvent for slurry preparation, dispersing electrode binders such as PVDF onto current collectors
- Pharmaceuticals: carrier solvent in topical drug delivery and processing aid in API synthesis
- Electronics: photoresist stripping and semiconductor cleaning
- Polymer processing: process solvent for aramid fibers, polyimide films and engineering membranes for gas separation and water treatment
- It dissolves polymers, resins and active compounds that resist conventional solvents.
Commercial specifications
- Purity commonly 99.5% and above
- Electronic grade meets tighter specifications for metal ion content and water
Other Names (Synonyms)
N-methylpyrrolidone|N-methyl-gamma-butyrolactam|N-methyl-alpha-pyrrolidone|N-methyl-alpha-pyrrolidinone|Methyl pyrrolidone|1-methylpyrrolidinone|1-methylpyrrolidin-2-one|1-methylazacyclopentan-2-one|NMP
What are the physical properties of n-methyl-2-pyrrolidone?
Melting Point -25 °C
Boiling Point 202 °C @ Press: 760 Torr
Density 1.027 g/cm³ @ Temp: 25 °C
Flash Point 187 °F
Appearance colourless or light yellow liquid with an amine odour
Color ≤20(APHA)
Odor Slight amine odor
Form Liquid
Water Solubility >=10 g/100 mL at 20 ºC
Vapor Pressure 0.29 mm Hg ( 20 °C)
Refractive Index n 20/D 1.479
pH 8.5-10.0 (100g/l, H2O, 20℃)
Log P -0.46 at 25℃
How is n-methyl-2-pyrrolidone classified and handled safely? Learn More
Danger
GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H227 Combustible liquid
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
Which trade and regulatory codes apply to n-methyl-2-pyrrolidone?
HS Code 29339900
UN Number 1268
ADR Class 3
Packing Group III
Storage Class 6.1C - Combustible acute toxic Cat.3
toxic compounds or compounds which causing chronic effects
WGK (Germany) 1