4411.12 - Of a thickness not exceeding 5 mm:

This HTS category, 4411.12, specifically covers medium density fiberboard (MDF) with a thickness not exceeding 5 millimeters. MDF is a panel product manufactured from wood fibers, which are bonded together with resins or other organic substances under heat and pressure. This classification applies to the raw fiberboard itself, before any further processing or finishing that might place it into a different HTS code.

Distinguishing this category from its siblings is crucial for accurate classification. HTS 4411.13 covers MDF of a thickness exceeding 5 mm but not exceeding 9 mm, while HTS 4411.14 encompasses MDF with a thickness exceeding 9 mm. Therefore, the primary differentiator for 4411.12 is its slender profile, making it suitable for applications where thinner paneling is required.

The subcategories under 4411.12 further refine the classification based on surface treatment or further working. The code 4411.12.10.00 is designated for MDF that has not undergone any mechanical working beyond basic shaping or any surface covering, such as laminates, veneers, or paint. The alternative, "Other," indicates that any MDF falling under the 5 mm thickness criteria that has been mechanically worked (e.g., routed, grooved) or surface covered will be classified in the subsequent subdivision.