7019.61.40.30 - Silica filament fabric of filaments with silica content greater than 93 percent (622)

This HTS category specifically classifies woven fabrics composed of glass rovings, where these rovings consist of filaments with a silica content exceeding 93 percent. These fabrics are characterized by a closed weave construction, distinguishing them from open-weave or other fabric types. The silica-rich nature of the filaments indicates a high-performance glass material, often used in applications requiring extreme temperature resistance, electrical insulation, or chemical inertness.

Within the broader classification of mechanically bonded fabrics of glass fibers, this subcategory is further refined by the type of weave and the composition of the filaments. While sibling category 7019.61.40.60 covers "Other" closed woven fabrics of rovings that are not colored, this specific code focuses on the subset of those fabrics that are not colored and are made from the specified high-silica content glass filaments. The "not colored" qualifier is crucial for differentiating from potentially dyed or pigmented fabrics within the same broader weave structure.

As this is a leaf node, there are no further subdivisions within this classification. Therefore, proper classification hinges on accurately identifying the fabric as a closed woven construction of glass rovings where each filament contains more than 93 percent silica and the fabric itself is not colored. Examples of goods that would fall here include specialized technical textiles used in aerospace, industrial insulation, or composite manufacturing where extreme thermal and chemical stability is paramount.