2830.90.20.00 - Cadmium sulfide

This classification covers cadmium sulfide, a specific inorganic chemical compound. Cadmium sulfide (CdS) is an important compound known for its semiconductor properties and its ability to fluoresce or phosphoresce when exposed to certain forms of energy, such as ultraviolet light or electron beams. Its primary uses are in phosphors for display screens, photoelectric devices, and as a pigment, although its use as a pigment has declined due to toxicity concerns.

Within the broader category of "Sulfides; polysulfides, whether or not chemically defined," this heading specifically isolates cadmium sulfide. It is distinguished from its siblings, which all pertain to zinc sulfide. While the other siblings detail zinc sulfide based on its grade and purity for luminescent applications or simply as "other zinc sulfide," this heading exclusively deals with the compound of cadmium and sulfur.

As this is a leaf node within the HTS, there are no further subcategories for cadmium sulfide. Therefore, classification at this level is definitive based on the chemical identity of the imported or exported product as cadmium sulfide. Any variations in its physical form (e.g., powder, crystalline) or specific purity levels are encompassed within this heading, provided the material is indeed cadmium sulfide and not a related compound or a mixture containing it.