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 This website is no longer updated and links to external websites and some internal pages may not work.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 3,6-Diemthyl-4-octyn-3,6-diol

These chemicals are used as surfactants in pesticide formulations applied to growing crops, raw agricultural commodities, and animals with use limitations of not more than 2.5% in formulation and application to soil prior to planting or to plants before the edible parts form.

  • 3,6-Diemthyl-4-octyn-3,6-diol - CAS No. 78-66-0
  • 2,4,7,9-Tetramethyl-5-decyn-4,7-diol - CAS No. 126-86-3
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.