HS Code for Trimethylolpropane

Trimethylolpropane (TMP) is classified under HS code 2905.41. This classification is determined by its chemical structure as a polyhydric alcohol, specifically 2-ethyl-2-(hydroxymethyl)propane-1,3-diol. Within the Harmonized System, Chapter 29 covers organic chemicals, and heading 2905 is dedicated to acyclic alcohols and their halogenated, sulfonated, nitrated, or nitrosated derivatives. Because TMP contains three hydroxyl groups, it is categorized as a polyhydric alcohol. Subheading 2905.41 is a specific provision for this compound due to its high volume of trade and its critical role as a building block in the chemical industry. It is primarily used in the synthesis of alkyd and polyurethane resins, synthetic lubricants, and multifunctional monomers for UV curing. To qualify for this code, the substance must be a separate chemically defined compound, typically meeting high purity standards required for industrial synthesis.

Products Included

• High-purity Trimethylolpropane (98% or greater)
• Technical grade Trimethylolpropane
• TMP flakes or molten form
• 2-ethyl-2-(hydroxymethyl)propane-1,3-diol

Common Misclassification

Trimethylolpropane is frequently misclassified under HS code 2905.39, which covers other diols. However, because TMP is a triol (containing three hydroxyl groups), it must be classified under the polyhydric alcohol subheadings. Another common error is using HS code 3824.99 for industrial mixtures. If the TMP is blended with other polyols or additives for a specific functional use, it may move to Chapter 38, but the pure chemical remains in 2905.41.

FAQ

What is the HS code for Trimethylolpropane?

The specific HS code for Trimethylolpropane is 2905.41, which refers to 2-ethyl-2-(hydroxymethyl)propane-1,3-diol.

Is Trimethylolpropane classified differently if it is in liquid form?

No, the physical state (flakes, powder, or molten/liquid) does not change the HS code 2905.41, provided it remains a separate chemically defined compound.