9902.05.29 - 2,2'-[(Phosphonomethyl)imino]diacetic acid hydrate (1:1) (CAS No. 5994-61-6) (provided for in subheading 2931.39.00)

This HTS category, 9902.05.29, specifically classifies a hydrate form of 2,2'-[(Phosphonomethyl)imino]diacetic acid, commonly known by its CAS Number 5994-61-6. This chemical compound, when imported under this specific provision, is subject to temporary legislation and modifications, as indicated by its placement within Chapter 99 of the Harmonized Tariff Schedule. The provision "provided for in subheading 2931.39.00" suggests that its underlying chemical classification falls under organo-inorganic compounds, but this 99xx code indicates a special tariff treatment rather than a general merchandise classification.

Distinguishing this category from its sibling nodes within the Chapter 99 group is crucial. Chapter 99 entries are inherently temporary and address specific trade policy measures, such as quotas, tariff rate quotas, or other restrictions proclaimed pursuant to trade agreements or specific legislation like Section 22 of the Agricultural Adjustment Act. Therefore, 9902.05.29 is distinct from other Chapter 99 entries that might cover different chemicals, or other types of goods subject to temporary measures, or even different phosphonates or related compounds classified under general merchandise chapters. Its specific chemical identity and CAS number are the primary identifiers for goods falling under this particular temporary provision.

As this is a leaf node within the HTS structure, there are no further subcategories to introduce. Classification under 9902.05.29 is definitive for the specified compound. The governing principle for this classification is adherence to the conditions and restrictions outlined by the temporary legislation under which it is proclaimed. Importers must ensure that the goods precisely match the chemical description and CAS number to qualify for the intended tariff treatment or to comply with any applicable import limitations.