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 This website is no longer updated and links to external websites and some internal pages may not work.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 Copper Naphthenate - CAS No. 1338-02-9

Copper naphthenate is approved by the Food and Drug Administration (FDA) as an indirect food additive, and for use in veterinary topical applications to the surface of horse and pony hooves that have Thrush. 

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