9902.05.25 - Di-tert-nonyl polysulfide (CAS No. 68425-16-1) (provided for in subheading 2930.90.91)

This HTS code, 9902.05.25, specifically covers Di-tert-nonyl polysulfide, identified by CAS Number 68425-16-1. While the official description provides the chemical identity, the "provided for in subheading 2930.90.91" notation indicates that this entry under Chapter 99 represents a temporary modification or restriction related to a good that would otherwise be classified in the chemical chapters. This special classification is established under Section XXII, which deals with special provisions and temporary measures, including those enacted under trade agreements or Section 22 of the Agricultural Adjustment Act.

As a leaf node within Chapter 99, this category does not have further subdivisions. Its uniqueness lies in its application as a temporary import control or modification for Di-tert-nonyl polysulfide, distinct from the standard classifications for chemicals. It highlights the dynamic nature of the HTS, which can be adjusted to address specific trade policy objectives or regulatory requirements on particular imported goods, rather than representing a broad product category itself.