9902.01.20 - Sodium, containing more than 200 ppm of calcium (CAS No. 7440-23-5) (provided for in subheading 2805.11.00)

This HTS category, 9902.01.20, specifically addresses sodium metal that contains more than 200 parts per million (ppm) of calcium. This classification is part of Section XXII, which encompasses special provisions including temporary legislation and additional import restrictions. The presence of a significant calcium impurity is the defining characteristic for goods falling under this code, distinguishing it from other forms or purities of sodium.

While other HTS codes may classify sodium in its elemental form (such as subheading 2805.11.00, as indicated in the provision), this particular code focuses on a specific impurity threshold. Therefore, it's crucial to differentiate based on the precise calcium content. This category does not have subcategories; it represents a distinct classification for a specialized grade of sodium metal subject to particular trade regulations.