9902.01.77 - Titanium(2+) dihydride (Titanium hydride) (CAS No. 7704-98-5) (provided for in subheading 2850.00.07)

HTS Code 9902.01.77 specifically classifies Titanium(2+) dihydride, also known as Titanium hydride, with the Chemical Abstracts Service (CAS) number 7704-98-5. This designation falls under Section XXII of the Harmonized Tariff Schedule, which pertains to Special Classification Provisions, Temporary Legislation, and temporary modifications or restrictions. The inclusion of "provided for in subheading 2850.00.07" indicates that while this material is temporarily classified here, its primary classification and inherent properties align with the basic chemical compounds outlined in Chapter 28.

This temporary provision differentiates itself from the numerous sibling categories within the broader HTS system, which typically cover a vast array of goods ranging from live animals (Chapters 01-05) to manufactured articles and machinery. The focus of this specific code is on a particular chemical compound, reflecting a specialized import regulation or temporary tariff modification rather than a general product category. Its placement within Chapter 99 signifies its unique status, often related to trade agreements, temporary legislative adjustments, or specific import restrictions enacted under provisions like Section 22 of the Agricultural Adjustment Act.

As this is a leaf node, there are no further subcategories for HTS Code 9902.01.77. Classification at this level is definitive for Titanium(2+) dihydride. Importers must ensure that the substance being declared precisely matches the chemical description and CAS number provided. This classification highlights the importance of precise chemical identification for compliance within specialized tariff provisions, particularly when temporary or restricted classifications are in effect.