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💾 Data Updated: 2025 HTS Revision 30 • Last updated: November 24, 2025

2918 - Carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulfonated, nitrated or nitrosated derivatives:

Sub-classifications

Commodity Code
Description

Overview

This HTS category, 2918, encompasses carboxylic acids that possess an additional oxygen functional group beyond the carboxyl group itself. This includes a wide array of derivatives such as anhydrides, halides, peroxides, and peroxyacids. Furthermore, the category extends to halogenated, sulfonated, nitrated, or nitrosated forms of these compounds. These substances are foundational in organic chemistry and find applications in various industrial processes, including pharmaceuticals, plastics, and agricultural chemicals.

Within Section VI, Chapter 29, this category is distinct from other organic chemical classifications by the specific presence of both a carboxylic acid group and another oxygen-containing functional group. For instance, it differentiates from simple carboxylic acids (Chapter 2915) by the presence of this secondary oxygen function. Its sibling categories at the highest HTS levels, such as live animals or mineral products, are fundamentally different in their chemical composition and intended use, with Chapter 29 focusing exclusively on organic compounds.

The subcategories within 2918 further refine the classification based on the nature of the additional oxygen function. For example, distinct subheadings exist for carboxylic acids with alcohol or phenol functions, or those containing aldehyde or ketone groups, each requiring careful examination of the molecular structure to determine the correct classification. The "Other" category serves to capture carboxylic acids with additional oxygen functions not specifically enumerated in the preceding subheadings, along with their derivatives. This hierarchical structure allows for precise identification and duty assessment for a diverse range of complex organic molecules.

Go up to Chapter 29: Organic chemicals

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