7019.62.40.30 - Silica filament fabric of filaments with silica content greater than 93 percent (622)

This HTS subcategory specifically covers woven fabrics manufactured from silica filaments, where the silica content of these filaments exceeds 93 percent. These materials are characterized by their high purity silica composition, which imparts exceptional thermal resistance and chemical inertness. The classification is applicable to fabrics formed through the weaving of rovings, and specifically those identified by the "(622)" indicator, denoting their specific manufacturing process or characteristic.

Distinguishing this category from its sibling, 7019.62.40.60, hinges on the color of the fabric. While both are categorized under "Other" mechanically bonded fabrics of rovings that are not colored, 7019.62.40.30 is the designation for those that are indeed "Not colored." Therefore, any woven fabric of high-purity silica filaments that has undergone any form of dyeing or pigmentation would fall under the sibling category, whereas uncolored or naturally occurring colored fabrics of this type are classified here.

As this is a leaf node within the HTS, there are no further subdivisions under this specific code. Therefore, the classification is finalized at this level based on the material (silica filament > 93%), construction (woven fabric from rovings), and color (not colored). Practical classification at this level relies heavily on verifying the silica content of the filaments and confirming the absence of any artificial coloring agents in the final fabric.