7019.66.40.21 - Weighing more than 215 grams per square meter, with a filament diameter of 7 to 13 microns (622)

This HTS subcategory, 7019.66.40.21, specifically covers mechanically bonded open-woven glass fiber fabrics that do not meet the criteria of the sibling category 7019.66.40.10. To fall within this classification, the fabric must be plain weave, have a width exceeding 30 cm, weigh more than 215 grams per square meter, and be composed of filaments with a diameter ranging from 7 to 13 microns. The "Other" designation at this level indicates that it captures fabrics that are not colored and do not fit into more specific weight-based sub-classifications.

The key differentiator for this category lies in its precise weight specification. While sibling category 7019.66.40.10 addresses fabrics weighing 185 grams or less per square meter, this classification is for fabrics that weigh *more* than 215 grams per square meter. The sibling category 7019.66.40.96 serves as a catch-all for any other mechanically bonded, open-woven, plain weave glass fabrics exceeding 30 cm in width and not colored, which do not conform to the specific weight and filament diameter parameters outlined here.

As a leaf node, this classification does not have further subcategories. Therefore, classification within 7019.66.40.21 is determined by meeting all the preceding criteria of plain weave, open-woven, over 30 cm width, uncolored, weighing more than 215 grams per square meter, and featuring filaments between 7 and 13 microns in diameter. This level of specificity ensures accurate customs reporting for specialized industrial glass fabrics.