An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Inert Reassessment Document for N-methylpyrrolidone - CAS No. 872-50-4

NMP is used by various industries as solvent for processing of petroleum, resins, acetylene, olefins, diolefins, and gas as well as for aromatic extraction from feedstock. This chemical also  has plastic solvent applications in the microelectronics industry.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.