3912.90.00 - Other

This HTS category, 3912.90.00, encompasses cellulose and its chemical derivatives that are not specifically classified elsewhere within Chapter 39. It serves as a residual category for these materials when they do not fall under the more specific headings for cellulose acetates, cellulose nitrates, or cellulose ethers. This means that any modified cellulose compound, in its primary form, that does not meet the precise definitions of the preceding subheadings will be considered under this "Other" classification.

To distinguish this category from its siblings, it is important to note that 3912.20.00.00 specifically covers cellulose nitrates, including collodions, which are characterized by their nitrogen content. Similarly, categories for cellulose acetates and cellulose ethers are defined by their specific ester or ether linkages to the cellulose backbone. Therefore, 3912.90.00 is reserved for those chemical derivatives of cellulose that possess different modifications or are not chemically identifiable as acetates, nitrates, or ethers.

Within this "Other" category, further subclassification exists to refine the classification of these residual cellulose derivatives. The subcategories differentiate based on the physical form and specific nature of the material. For instance, α-cellulose in granular, microcrystalline, or powdered forms has a distinct designation, acknowledging its specific physical characteristics and common industrial applications. The remaining items within this "Other" category are captured by a general residual subheading, ensuring that all remaining cellulose derivatives not explicitly listed are still accounted for within the HTS framework.