HS Code 29.25 – Carboxyimide-function compounds (including saccharin and its salts) and imine-function compounds

HS code 2925 is a 4-digit heading in the Harmonized System that covers: Carboxyimide-function compounds (including saccharin and its salts) and imine-function compounds. Heading 2925 covers 'Carboxyimide-function compounds (including saccharin and its salts) and imine-function compounds,' a distinct category within Chapter 29 of the Harmonized System. This classification is dedicated to organic compounds containing an imide group (-CO-N-CO-) or an imine group (-C=N-). The inclusion of saccharin and its salts specifically highlights the importance of this artificial sweetener within the heading. The scope requires careful differentiation from amides (2924) and heterocyclic compounds containing nitrogen (2933), as the precise chemical structure of the imide or imine functionality is the determining factor. For importers, exporters, and customs brokers, accurate classification under 2925 is crucial for ensuring compliance with tariff regulations and avoiding potential trade barriers. These compounds find diverse applications in pharmaceuticals, agrochemicals, dyes, and as artificial sweeteners. The historical development of saccharin as one of the first artificial sweeteners underscores the trade significance of this heading. Its placement within Chapter 29 confirms their identity as chemically defined organic compounds, playing a vital role as intermediates and finished products in various industries worldwide. Understanding the nuances of imide and imine structures is key to navigating this classification effectively.

Saccharin, Sodium saccharin, Calcium saccharin, Potassium saccharin, Phthalimide, Succinimide, Maleimide, Glutarimide, N-Phenylmaleimide, N-Hydroxysuccinimide, N-Bromosuccinimide, N-Chlorosuccinimide, Diphenylmethanimine, Cyclohexanone oxime, Acetophenone oxime, Benzophenone imine, N,N'-Disuccinimidyl carbonate, N-Methylphthalimide, Ethylenimine (Aziridine), N-Ethylmaleimide

Misclassification under 2925 often occurs due to confusion with other nitrogen-function compounds. Traders sometimes mistakenly classify imides under 2924 (Carboxyamide-function compounds) because of the structural similarity between amide and imide groups, requiring a clear understanding of the -CO-N-CO- structure. Another common error is placing imine-function compounds or imides that are also heterocyclic under 2933 (Heterocyclic compounds), even if their primary function is an imine or imide. For instance, some oxime derivatives might be confused with other nitrogen compounds if the imine functionality is not clearly identified. Careful attention to the specific chemical definition is essential.

In 2025, the top exporters of HS code 2925 in UN Comtrade data were China ($834M, 35% of world exports), Germany ($274M) and France ($215M). World exports came to about $2.4B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

In 2025, the top importers of HS code 2925 in UN Comtrade data were the United States ($344M, 14% of world imports), China ($268M) and Brazil ($226M). World imports came to about $2.5B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

HS code 2925 is a 4-digit heading under Chapter 29 of the Harmonized System. The first 2 digits (29) identify the chapter, and digits 3-4 (25) specify the heading. This code contains multiple 6-digit subheadings for precise product classification.