4411.13.20.00 - Laminated boards bonded in whole or in part, or impregnated, with synthetic resins

This HTS subcategory encompasses medium density fiberboard (MDF) that is between 5 mm and 9 mm in thickness. Crucially, these boards are characterized by having been tongued, grooved, or rabbetted continuously along any of their edges. Furthermore, their design and construction must specifically indicate dedication for use in the construction of walls, ceilings, or other architectural components of buildings. This means the edge profiling is not merely decorative but functional for interlocking or joining pieces in building applications.

The distinction from its sibling category, 4411.13.30.00 "Other," lies in the specific edge treatment and intended end-use. While the sibling category would cover MDF of the same thickness but without the continuous tongued, grooved, or rabbetted edges, or if these edge features are not designed for building applications, this subcategory precisely captures those boards specifically engineered for integrated installation within building structures. The continuous profiling is key to distinguishing these specialized building panels.

As this classification represents a leaf node within the HTS, there are no further subcategories. Classification at this level is definitive based on the material (MDF), thickness range (exceeding 5 mm but not exceeding 9 mm), the presence of continuous tongued, grooved, or rabbetted edges, and its designated application in building construction. Examples would include tongue-and-groove MDF panels for interior wall cladding or ceiling tiles designed for a suspended grid system where the edges interlock.