3907.61.00.50 - Other

This HTS code classification pertains to Poly(ethylene terephthalate) (PET) resins specifically having a viscosity number that falls within the range of 78 ml/g or more, but not exceeding 88 ml/g. These PET resins are typically found in primary forms such as pellets, granules, or powders, and are intended for further manufacturing processes. The viscosity number is a critical physical characteristic that indicates the molecular weight and processing behavior of the polymer.

As this is a specific sub-classification within PET resins, it is distinct from other PET classifications that may cover resins with different viscosity ranges or those with additional additives or treatments that alter their properties or intended end-use. The defined viscosity range suggests these resins are formulated for particular applications where a mid-to-high molecular weight is required, impacting their melt strength, tensile properties, and suitability for specific molding or extrusion techniques.

Given that this node is a leaf node, there are no further subcategories. Therefore, the classification is complete at this level, defining a precise segment of PET resins based on a quantifiable physical property – their viscosity number. Importers and exporters should ensure that their goods, when presented in primary form, meet this specific viscosity range to be correctly classified under 3907.61.00.50.