2909.41.00.00 - 2,2'-Oxydiethanol (Diethylene glycol, Digol)

This HTS classification, 2909.41.00.00, specifically covers 2,2'-Oxydiethanol, also widely known as diethylene glycol or Digol. This compound is a dihydric alcohol where two ethanol molecules are linked by an ether bond. It is a colorless, practically odorless, viscous liquid with hygroscopic properties and is miscible with water, alcohols, and many other organic solvents. Its primary uses include applications as a solvent, a plasticizer, a humectant, and as an intermediate in the production of polyester resins, polyurethanes, and other chemical compounds.

Distinguishing this specific classification from its siblings, 2909.43.00.00 and 2909.44.01, is crucial. While all fall under ether-alcohols, 2909.41.00.00 is for the *unsubstituted* diethylene glycol itself. In contrast, 2909.43.00.00 and 2909.44.01 cover *monoalkyl ethers* of ethylene glycol or diethylene glycol. This means those categories include compounds where one of the hydroxyl groups of diethylene glycol (or ethylene glycol) has been reacted with an alkyl group (e.g., monobutyl ether of diethylene glycol), whereas 2909.41.00.00 is solely for the diethylene glycol molecule without such ether substituents.

As 2909.41.00.00 represents a leaf node within the HTS structure, there are no further subcategories to introduce. Classification under this heading is definitive for diethylene glycol itself, requiring identification of the compound based on its chemical structure and common nomenclature. The absence of further subdivisions indicates that this particular ether-alcohol does not have specific functional derivatives or structural variations that warrant separate HTS codes at this detailed level.