9902.01.57 - Sodium hypophosphite monohydrate (CAS No. 10039-56-2) (provided for in subheading 2835.10.00)

This HTS category, 9902.01.57, specifically covers Sodium hypophosphite monohydrate, identified by CAS No. 10039-56-2. This chemical compound is a salt of hypophosphorous acid and is typically encountered in its monohydrate crystalline form. Its classification within Chapter 99 signifies that it is subject to temporary legislation or modifications, distinct from its permanent classification under subheading 2835.10.00.

As a leaf node within the HTS structure, this category does not contain further subdivisions. Its importance lies in its specific designation under special provisions, indicating that its import or export may be subject to particular temporary restrictions, duties, or licensing requirements not applicable to its standard tariff classification. This is crucial for trade professionals to recognize when handling shipments of this particular chemical, as it signals a departure from the general rules of Chapter 28.

The distinction between this temporary provision and its permanent classification under 2835.10.00 is critical. While 2835.10.00 covers all hypophosphites, including sodium hypophosphite (anhydrous or hydrated), this 9902 code points to a specific, temporary regulatory overlay that supersedes or supplements the general classification. This temporary legislation could be enacted for reasons such as trade policy adjustments, national security, or specific market interventions, requiring careful attention to compliance by importers and exporters.