9902.12.10 - Rectangular plastic block filled with a polymer based freezer gel, designed to attach to reusable food storage containers (provided for in 3926.90.99)

This classification, HTS Code 9902.12.10, pertains to a specific type of accessory designed to enhance reusable food storage containers. It covers rectangular plastic blocks that are pre-filled with a polymer-based freezer gel. The primary function of these items is to maintain a desired temperature within food storage containers, thereby preserving the freshness and safety of their contents, particularly when used for freezing or chilling purposes.

Distinguishing this category from its sibling chapters, which often deal with raw materials, finished goods under standard chapters (e.g., Chapter 39 for plastics), or entirely different types of articles, is its unique status within Chapter 99. Chapter 99 is reserved for temporary legislation, trade agreement modifications, and specific import restrictions. This particular code signifies a temporary classification or modification related to the importation of these specialized gel-filled blocks, which are intended to complement products found elsewhere in the HTS, specifically noted as being provided for under HTS 3926.90.99 (Other articles of plastics and articles of other materials of headings 3901 to 3914, not elsewhere specified or included).

As HTS Code 9902.12.10 represents a leaf node, it does not have further subdivisions. Therefore, the focus for classification under this code is on the precise characteristics of the imported goods: their construction (rectangular plastic block), their filling (polymer-based freezer gel), and their intended use (attachment to reusable food storage containers). Any deviations in material, design, or primary function would necessitate re-evaluation under different HTS provisions.