3901.10.10.00 - Having a relative viscosity of 1.44 or more

This category specifically covers polyethylene in its primary form that possesses a relative viscosity of 1.44 or greater. Polyethylene is a versatile thermoplastic polymer derived from ethylene, and this classification distinguishes it based on a specific physical property – its relative viscosity. This metric is a crucial indicator of the polymer's molecular weight and chain length, directly influencing its processing characteristics and end-use applications. Examples of products falling under this classification would include various grades of polyethylene resins that exhibit this higher viscosity, often intended for demanding applications where strength and durability are paramount.

The key differentiator for this sub-heading, 3901.10.10, is the relative viscosity threshold of 1.44 or more. It is distinguished from its sibling category, 3901.10.50 "Other," which would encompass polyethylene having a specific gravity of less than 0.94 but a relative viscosity *below* 1.44. Therefore, the determination between these two categories hinges on the precise measurement of the material's relative viscosity.

As this is a leaf node within the HTS structure, there are no further subcategories. Classification under this heading is definitive once the polyethylene is confirmed to have a specific gravity less than 0.94 and a relative viscosity of 1.44 or greater. This requires careful examination of technical specifications and product data sheets provided by manufacturers to ensure accurate customs declaration.