2905.32.00.00 - Propylene glycol (Propane-1,2-diol)

This HTS classification covers propylene glycol, also known as propane-1,2-diol. Propylene glycol is a diol, a type of organic compound characterized by the presence of two hydroxyl (-OH) groups. It is a clear, colorless, viscous liquid with a faintly sweet taste, widely used in various industrial and consumer applications. Its chemical structure, with hydroxyl groups on adjacent carbon atoms, defines its inclusion within this specific subheading.

This subheading is distinct from its sibling, 2905.31.00.00, which specifically covers ethylene glycol (ethanediol). While both are diols and share similar industrial uses, propylene glycol differs in its chemical structure, having a three-carbon chain with hydroxyl groups on the first and second carbons, as opposed to ethylene glycol's two-carbon chain. This structural difference leads to variations in their physical properties and ultimate applications.

As a leaf node, 2905.32.00.00 does not have further subdivisions. Therefore, all forms and purities of propylene glycol fall under this specific HTS code. When classifying, emphasis should be placed on confirming the identity of the substance as propane-1,2-diol through technical documentation, chemical analysis, or supplier declarations, ensuring it meets the definition of propylene glycol for customs purposes.