3102.10.00.30 - Diesel exhaust fluid (DEF) of a kind meeting ISO 22241

This HTS classification, 3102.10.00.30, specifically designates Diesel Exhaust Fluid (DEF) that meets the ISO 22241 standard. DEF is a crucial component in Selective Catalytic Reduction (SCR) systems used to reduce nitrogen oxide (NOx) emissions from diesel engines. It is primarily composed of automotive grade urea and deionized water, forming an aqueous solution. The key defining characteristic for this classification is adherence to the stringent ISO 22241 standard, which ensures the purity and quality necessary for effective and safe use in modern diesel vehicles.

While the parent category encompasses urea, whether or not in aqueous solution, and is broadly defined under "Mineral or chemical fertilizers, nitrogenous," this specific subcategory carves out a distinct niche. It distinguishes DEF from other forms of urea, including those used directly as fertilizers or industrial chemicals, by its specific application and the requirement to meet the ISO 22241 standard. The sibling category, 3102.10.00.50, covers "Other" urea, implying any urea or aqueous urea solutions that do not qualify as DEF meeting ISO 22241.

As this classification is a leaf node, there are no further subcategories. Therefore, the focus remains on accurately identifying goods that fit the definition of ISO 22241 compliant DEF. This includes understanding that while the base chemical is urea, its intended use and the mandated quality standards set it apart from general fertilizer or industrial-grade urea. Importers must ensure their product is labeled and documented as meeting ISO 22241 to correctly classify under this heading.