2924.21.18.00 - sym-Diethyldiphenylurea

This HTS category, specifically 2924.21.18.00, encompasses sym-diethyldiphenylurea. This compound is a derivative of urea where the hydrogen atoms on the nitrogen have been substituted by two ethyl groups and two phenyl groups, arranged symmetrically. Its primary application is often as a stabilizer or intermediate in various industrial processes, particularly within the polymer and rubber industries, where it can contribute to improved product performance and longevity.

Distinguishing this category from other "Other" subcategories within aromatic ureines involves the specific chemical structure. While other "Other" categories might include different substituted aromatic ureines, this particular subcategory is precisely defined by the sym-diethyldiphenylurea structure. The symmetry and the presence of both ethyl and phenyl substituents are the key determinative factors for classification here.

As sym-diethyldiphenylurea is a leaf node within the HTS structure, there are no further subcategories to introduce. Classification within this specific code relies entirely on the accurate identification of the chemical compound itself, based on its molecular structure and composition. Customs declarations must precisely name this compound to ensure correct entry under this heading.