2818.10.20.90 - Other

This HTS classification, 2818.10.20.90, specifically covers "Other" artificial corundum in grains, or ground, pulverized, or refined. This broad category encompasses artificial corundum that does not meet the stringent purity requirements of its sibling classification, 2818.10.20.10. While the sibling category is reserved for white, pink, or ruby artificial corundum with a very high aluminum oxide content (exceeding 97.5% by weight), this residual "Other" classification serves to capture artificial corundum that may contain impurities, coloring agents other than those that define the specific ruby or pink varieties, or falls outside the defined purity threshold.

The key differentiator for this category lies in the absence of the specific chemical composition and aesthetic characteristics mandated by the "White, pink or ruby" classification. Products falling under 2818.10.20.90 would typically be industrial-grade artificial corundum used for abrasives, refractories, or polishing compounds, where precise color and extremely high aluminum oxide content are not the primary defining factors for their intended application. The physical form of grains, or ground, pulverized, or refined particles remains a consistent characteristic across these sibling categories within the broader classification of artificial corundum.