2905.39.10.00 - Butylene glycol

This HTS classification, 2905.39.10.00, specifically covers butylene glycol, a type of diol (an acyclic alcohol with two hydroxyl groups). Butylene glycol, also known as 1,3-butanediol or 1,4-butanediol depending on the isomer, is characterized by its four-carbon chain with alcohol functional groups. It finds widespread application as a humectant, solvent, and intermediate in various industries, including cosmetics, pharmaceuticals, and polyester resin production.

Within the broader category of "Diols," this subcategory distinguishes itself from its siblings by its specific chemical structure and common commercial uses. While 2905.39.20.00 covers neopentyl glycol and 2905.39.60.00 refers to hexylene glycol, this heading is dedicated solely to butylene glycol isomers and their mixtures. The catch-all category, 2905.39.90.00, is reserved for other diols not specifically enumerated.

As this is a leaf node within the HTS, there are no further subcategories under 2905.39.10.00. Classification under this code is determined by the specific identification of the product as butylene glycol, irrespective of its isomer or purity, provided it meets the general criteria for acyclic alcohols and their derivatives within Chapter 29.