Are NMP, N-Methyl-2-pyrrolidone and 1-Methyl-2-pyrrolidinone the same solvent?

Yes. These names identify CAS 872-50-4, a polar aprotic solvent. NMP is not N-ethyl-2-pyrrolidone, 2-pyrrolidone or gamma-butyrolactone. Use the CAS number, grade and intended process to prevent substitution.

What is NMP used for?

NMP is used as a polar aprotic solvent in lithium-ion battery electrode processing, electronics and semiconductor cleaning, polymer and coating systems, aromatic extraction and selected chemical or pharmaceutical processes. The required purity and regulatory acceptance depend on the end market and process.

How do industrial, battery and electronic NMP grades differ?

They can differ in assay, water, color, total amines, acidity, nonvolatile residue, gamma-butyrolactone and trace-metal limits. Industrial, electronic and microelectronic grades are not interchangeable, so compare the complete methods and limits for the intended process.

What are the key physical properties of NMP?

NMP is a colorless to pale-yellow polar aprotic liquid with formula C5H9NO and molecular weight about 99.13 g/mol. It melts near -24 C, boils near 202-204 C, has density about 1.026-1.033 g/mL, and is miscible with water and many organic solvents.

Why does NMP require regulatory review for some uses?

NMP is classified as a reproductive toxicant under EU CLP, is listed on the REACH SVHC candidate list and is subject to REACH restrictions in Europe. For regulated or consumer-facing applications, confirm the destination rules and whether a replacement such as N-ethyl-2-pyrrolidone is acceptable.

N-Methyl-2-pyrrolidone (NMP) CAS 872-50-4

N-Methyl-2-pyrrolidone (NMP) is a polar aprotic solvent identified by CAS 872-50-4 and EC 212-828-1. For a solvent inquiry, state the process, destination, and specification because controls vary by use context.

CAS: 872-50-4
Synonyms: N-Methyl-2-pyrrolidone; NMP; 1-Methyl-2-pyrrolidone
Einecs: 212-828-1
Molecular Formula: C₅H₉NO
Grade: Confirm the current product-specific specification.
Package: Confirm packaging requirements for the proposed material and destination.

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Product Description

N-Methyl-2-pyrrolidone (NMP) is a polar aprotic solvent identified by CAS 872-50-4 and EC 212-828-1.

Melting point: confirm the current product-specific specification.

Boiling point: confirm the current product-specific specification.

Density: confirm the current product-specific specification.

Refractive index: confirm the current product-specific specification.

Flash point and handling requirements: confirm the current product-specific specification.

Viscosity: confirm the current product-specific specification.

Surface tension: confirm the current product-specific specification.

Solubility and process compatibility: confirm the current product-specific specification.

Dielectric-property requirements: confirm the current product-specific specification.

Handling, storage, and process requirements must be reviewed against the applicable SDS and current product-specific specification.

NMP may be evaluated for chemical processing, polymer or coating systems, and other solvent applications when the required specification and destination requirements are defined.

Recovery or recycling requirements are process-specific and must be evaluated separately.

FAQ - Technical & Supply Chain

Q:
Are NMP, N-Methyl-2-pyrrolidone and 1-Methyl-2-pyrrolidinone the same solvent?

A: Yes. These names identify CAS 872-50-4, a polar aprotic solvent. NMP is not N-ethyl-2-pyrrolidone, 2-pyrrolidone or gamma-butyrolactone. Use the CAS number, grade and intended process to prevent substitution.
Q:
What is NMP used for?

A: NMP is used as a polar aprotic solvent in lithium-ion battery electrode processing, electronics and semiconductor cleaning, polymer and coating systems, aromatic extraction and selected chemical or pharmaceutical processes. The required purity and regulatory acceptance depend on the end market and process.
Q:
How do industrial, battery and electronic NMP grades differ?

A: They can differ in assay, water, color, total amines, acidity, nonvolatile residue, gamma-butyrolactone and trace-metal limits. Industrial, electronic and microelectronic grades are not interchangeable, so compare the complete methods and limits for the intended process.
Q:
What are the key physical properties of NMP?

A: NMP is a colorless to pale-yellow polar aprotic liquid with formula C5H9NO and molecular weight about 99.13 g/mol. It melts near -24 C, boils near 202-204 C, has density about 1.026-1.033 g/mL, and is miscible with water and many organic solvents.
Q:
Why does NMP require regulatory review for some uses?

A: NMP is classified as a reproductive toxicant under EU CLP, is listed on the REACH SVHC candidate list and is subject to REACH restrictions in Europe. For regulated or consumer-facing applications, confirm the destination rules and whether a replacement such as N-ethyl-2-pyrrolidone is acceptable.

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