7019.64.40.30 - Silica filament fabric of filaments with silica content greater than 93 percent (622)

This classification, HTS 7019.64.40.30, specifically covers woven fabrics made from glass filaments with a high silica content, exceeding 93 percent. These fabrics are further defined by their construction: they are mechanically bonded, forming closed-woven structures, and are manufactured using a plain weave technique with yarns that have been either coated or laminated. The "Not colored" designation signifies that the fabric itself is not dyed or pigmented during its manufacturing process.

This category is distinguished from its sibling, 7019.64.40.60, by the specific "Other" designation within the "Not colored" level. While both fall under closed woven fabrics of coated or laminated yarns, the distinction likely rests on subtle manufacturing variations or specific end-use characteristics not explicitly detailed at this level, but which necessitate separate statistical reporting. The parent categories indicate that these are articles derived from glass fibers, moving from broader categories like mechanically bonded fabrics to more specific constructions.

As this is a leaf node in the HTS structure, there are no further subdivisions. Therefore, classification within this category is definitive based on meeting all the preceding criteria: being a mechanically bonded, closed woven fabric of plain weave, made from coated or laminated yarns, composed of silica filaments with over 93% silica content, and remaining uncolored. Practical examples would include specialized industrial fabrics used in high-temperature insulation or as reinforcing materials where exceptional heat resistance and chemical inertness are paramount.