2905.39 - Other:

This HTS category, 2905.39, encompasses diols, which are alcohols containing two hydroxyl (-OH) functional groups on an acyclic carbon chain, that are not elsewhere specified. These compounds are distinct from their specifically enumerated siblings, such as ethylene glycol (2905.31) and propylene glycol (2905.32), which represent the most common diols and are therefore classified under more specific headings.

The classification of a diol under 2905.39 hinges on its chemical structure and the absence of any other provision that more accurately describes it. This broader category serves as a residual for diols that do not fall under the more precisely defined subheadings. Understanding the specific chemical identity and the number of carbon atoms, as well as the positions of the hydroxyl groups, is crucial for correct classification.

Within this category, further subdivisions exist to classify specific diols. These include butylene glycol (2905.39.10), neopentyl glycol (2905.39.20), and hexylene glycol (2905.39.60), each representing diols with distinct carbon chain lengths and structural arrangements. A final subheading, 2905.39.90, captures any other diols not otherwise specified, underscoring the comprehensive nature of this classification for acyclic diols.