9606.30.40.00 - Button blanks of casein

This HTS category, 9606.30.40.00, specifically covers button blanks manufactured from casein. Casein is a milk protein that, when processed, can form a hard, plastic-like material suitable for the production of buttons. These are unfinished or partially finished components intended to be further processed into functional buttons, but they are not yet ready for attachment to apparel or other goods.

This subcategory is distinct from its sibling, 9606.30.80.00 ("Other"), which would encompass button blanks made from any material other than casein. Therefore, the key differentiating factor for classification within this node is the specific raw material: casein. If a button blank is not made of casein, it would fall under the "Other" category at the same level.

As this is a leaf node in the HTS classification, there are no further subcategories. Classification under 9606.30.40.00 is final for button blanks composed of casein. Importers should ensure that the material composition is accurately declared to avoid misclassification and potential customs delays. The physical form of these blanks may vary, but their essential characteristic is that they are the precursor material for buttons made from casein.