3823.13.00.20 - Containing less than two percent rosin

This HTS category, 3823.13.00.20, specifically covers tall oil fatty acids that contain less than two percent rosin. Tall oil fatty acids are derived from the processing of wood pulp and are characterized by their long hydrocarbon chains and carboxylic acid functional groups. This sub-classification is crucial for distinguishing these specific tall oil fatty acids from other related products.

The distinction from its sibling category, 3823.13.00.40 "Other," lies in the precise quantitative threshold for rosin content. While 3823.13.00.40 would encompass tall oil fatty acids with two percent or more rosin, or those where the rosin content is not specified or relevant for classification, this category is reserved for materials demonstrably below that two percent threshold. This precise measurement is a key criterion for accurate customs declaration.

As this classification represents a leaf node within the HTS, there are no further subcategories. Therefore, the focus for classification professionals is on the explicit definition of tall oil fatty acids and the critical determinant of rosin content being under two percent. This ensures accurate trade data and appropriate duty assessment for these specific chemical products.