2804.61.00.00 - Containing by weight not less than 99.99 percent of silicon

This HTS classification, 2804.61.00.00, specifically covers silicon that is of exceptionally high purity, containing by weight not less than 99.99 percent silicon. This level of purity is crucial for applications in specialized industries, most notably in the manufacturing of semiconductors and solar cells, where even minute impurities can significantly impact performance. The classification emphasizes the material's chemical composition as the primary defining characteristic.

This category is distinct from its sibling, 2804.69, which is designated for "Other" silicon. The key differentiating factor lies in the minimum percentage of silicon. While 2804.61.00.00 is reserved for hyper-pure silicon, 2804.69 would encompass silicon with a lower percentage of purity, suitable for less demanding industrial applications such as silicones, alloys, or other chemical manufacturing processes where such high purity is not a requirement.

As this is a leaf node within the HTS structure, there are no further subcategories. Therefore, the classification is definitive for silicon meeting the precise 99.99 percent purity threshold. Classification into this code relies solely on the verified purity of the silicon, typically demonstrated through certificates of analysis or other laboratory testing results.