3824.40.10.00 - Containing 5 percent or more by weight of one or more aromatic or modified aromatic substances

This HTS category, 3824.40.10.00, specifically covers prepared additives for cements, mortars, or concretes that contain five percent or more by weight of one or more aromatic or modified aromatic substances. These are chemical preparations designed to enhance the properties of cementitious mixtures, such as improving workability, accelerating or retarding setting times, increasing strength, or imparting water repellency. The defining characteristic for classification here is the presence of these specific aromatic or modified aromatic compounds at a significant percentage by weight.

This classification is distinct from its sibling categories. Specifically, 3824.40.20.00 covers prepared additives that consist *wholly* of inorganic substances, meaning they lack the aromatic or modified aromatic components that are central to this category. Similarly, 3824.40.50.00, categorized as "Other," would encompass prepared additives that do not meet the criteria of this specific aromatic-based classification or the inorganic-only classification.

As a leaf node, 3824.40.10.00 does not have further subcategories. Therefore, the focus for classification under this code is on accurately determining the composition of the additive. Importers and exporters should be prepared to provide detailed chemical breakdowns and weight percentages to verify the presence of the specified aromatic or modified aromatic substances and ensure they constitute at least five percent of the total weight. Examples could include certain types of plasticizers, emulsifiers, or curing agents that utilize aromatic structures as their active components.