Gamma-Butyrolactone (GBL) from Canada
Gamma-butyrolactone is a five-membered lactone ring (cyclic ester) with oxygen hetero-atom, used as solvent and precursor. Falls under HTS 2932.99.90 as other oxygen heterocycles, distinguished from excluded cyclic esters of polyhydric alcohols.
Duty Rate — Canada → United States
13.7%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• DEA List I chemical; requires importer registration and advance notice per 21 CFR 1310
• Lactone structure verified by IR spectroscopy; distinguish from polymer grades