How to Buy N-Methyl-2-pyrrolidone (NMP): Grades, Specs and COA

NMP (CAS 872-50-4) is a commodity solvent, but its specifications vary widely – and a “cheaper” quote can simply be a lower grade. This guide covers the grades, the parameters that matter, packaging and the paperwork to confirm, so you can compare quotations like-for-like.

1. Pick the grade first

Grade	Purity	Water content	Use
Industrial / technical	99.5% min	About 0.05 – 0.1% max	Coatings, cleaning, general solvent use
Battery grade	99.8 – 99.9% min	Often 200 ppm max or lower	Lithium-ion cathode slurry
Electronic grade	99.9% min	Very low (ppm)	Photoresist stripping, semiconductor cleaning
Pharmaceutical grade	Per USP / EP	Per monograph	Pharma processing

Match the grade to the use: buying industrial grade for battery slurry, or electronic grade for general cleaning, is either a quality risk or a waste of money.

2. The parameters that matter

Parameter	Why it matters
Assay / purity	Sets how the solvent behaves and how much you need
Water content	The key parameter for battery and electronic use; NMP is hygroscopic
Metal ions	Contamination risk for batteries and electronics
Colour / appearance	Indicator of purity and of recovered solvent quality
Free amine / pH	Traces of amine affect some reactions and can cause odour and corrosion

3. Packaging and logistics

Form	Typical packaging
Drums	200 L steel or plastic drums
IBC	1000 L intermediate bulk containers
Bulk	ISO tanks and road tankers

NMP is hygroscopic, so packaging must keep moisture out and containers must stay sealed. For battery and electronic buyers, confirm the water content at loading and the packaging suit your unload and storage. Check the SDS for the transport classification and any labelling requirements for your route.

4. Regulation to be aware of

Reprotoxic (Repr. 1B) and an EU SVHC – it carries hazard labelling and requires exposure control.
EU REACH restriction – Annex XVII entry 71 restricts NMP in mixtures at 0.3% or more for certain uses unless the risk is controlled; confirm the current rules for your use and market.
Documentation – ask for the SDS and confirm the labelling and transport classification for your route.

5. Supplier checklist

States the grade and the assay, water content and metal-ion limits in writing.
Provides a per-batch COA and SDS.
Confirms packaging and moisture protection.
Confirms transport classification and requirements.
Quotes FOB or CIF to your port, with lead time.

6. Getting the best terms

NMP is a large-volume commodity, and price tracks the feedstock cycle, so quotes move. For steady users – battery lines especially – quote an annual or quarterly volume and align deliveries with your consumption and storage. As a major producer and exporter, China supplies a large share of the global NMP market, which keeps supply broad and competitive. Tell us the grade, water-content specification, tonnage and discharge port for a quotation.

Frequently Asked Questions

What grade of NMP do I need?

Match it to the use: battery grade for lithium-ion cathode slurry, electronic grade for photoresist stripping, and industrial grade for general solvent, coatings and cleaning.

What water content should I specify?

For battery use, often 200 ppm max or lower; for electronic use, even lower. For general industrial use, about 0.05-0.1% is typical. Confirm against the COA.

Is NMP a hazardous material for transport?

NMP is reprotoxic and carries hazard labelling; check the SDS for the transport classification and any requirements for your route and destination.

How is NMP packaged?

In 200 L drums, 1000 L IBCs, ISO tanks and road tankers – sealed to keep moisture out, because NMP is hygroscopic.