7019.13.05.00 - Fiberglass rubber reinforcing yarn, made from electrically nonconductive continuous fiberglass filaments 9 microns in diameter to 11 microns in diameter and impregnated with resorcinol formaldehyde latex treatment for adhesion to polymeric compounds

This HTS category, 7019.13.05.00, specifically covers fiberglass reinforcing yarn designed for adhesion to polymeric compounds. The defining characteristics are its composition of electrically nonconductive continuous fiberglass filaments, with a precise diameter ranging from 9 to 11 microns. Crucially, this yarn undergoes a resorcinol formaldehyde latex treatment, which is essential for its intended reinforcing function within plastics and other polymer-based materials.

This classification is distinguished from its sibling category, 7019.13.15 ("Other"), by the presence of the specified impregnating treatment. While other yarns at this level may also be composed of fiberglass filaments, the defining feature here is the specific chemical treatment that facilitates bonding with polymeric materials, indicating a specialized application beyond general textile use.

As this is a leaf node within the HTS classification structure, there are no further subcategories. Therefore, the focus is on the precise physical and chemical attributes of the product itself. Examples of goods that would fall under this classification include yarns used in the manufacturing of fiberglass-reinforced plastics for automotive parts, boat hulls, sporting goods, and other structural applications where enhanced strength and durability are required.