2909.43.00.00 - Monobutyl ethers of ethylene glycol or of diethylene glycol

This HTS category, 2909.43.00.00, specifically covers monobutyl ethers of ethylene glycol and diethylene glycol. These are organic compounds where a butyl group is attached to an oxygen atom that is itself bonded to either an ethylene glycol or a diethylene glycol molecule. These chemicals are characterized by the presence of both ether and alcohol functional groups.

To differentiate this category from its siblings, it's important to note the specific alkyl substituent. While 2909.41.00.00 covers the unetherified diethylene glycol itself, and 2909.44.01 captures other monoalkyl ethers of ethylene glycol or diethylene glycol (e.g., monoethyl or monomethyl ethers), 2909.43.00.00 is exclusively for the *monobutyl* ethers. The remaining sibling, 2909.49, serves as a catch-all for "Other" ether-alcohols not specifically enumerated.

As a leaf node, this classification has no further subdivisions. Therefore, classification within 2909.43.00.00 relies on confirming the presence of a monobutyl ether linkage to either ethylene glycol or diethylene glycol. This distinction is critical for accurate import and export declarations, ensuring compliance with trade regulations and the correct application of tariffs.