9902.01.66 - Potassium Tetraborate (CAS No. 12045-78-2) (provided for in subheading 2840.20.00)

This HTS classification, 9902.01.66, specifically addresses Potassium Tetraborate, identified by CAS Number 12045-78-2. This designation falls under Chapter 99, which pertains to temporary legislation and modifications, particularly those enacted under Section 22 of the Agricultural Adjustment Act, as amended. The primary purpose of this category is to implement temporary import restrictions or conditions on this specific chemical compound when it is provided for under subheading 2840.20.00, which covers other borates.

Unlike the broader categories found in Chapters 1-98 of the HTS, which classify goods based on their inherent nature and function for general trade, Chapter 99 categories are dynamic. They exist to apply specific, often time-limited, regulatory measures. Therefore, this entry for Potassium Tetraborate is distinguished from general chemical classifications by its inclusion in a temporary legislation chapter, indicating that its importation may be subject to special rules, quotas, or duties beyond the standard tariff applied to the substance in its base classification under 2840.20.00.

As this is a leaf node within Chapter 99, there are no further subcategories. The classification is highly specific and points directly to a particular chemical compound subject to Section 22 provisions. Importers should consult the specific proclamations and regulations associated with this HTS number to understand the precise requirements for importing Potassium Tetraborate, including any quantitative limits, licensing needs, or additional duties that may apply.