4411.13 - Of a thickness exceeding 5 mm but not exceeding 9 mm:

This HTS category, 4411.13, specifically classifies medium density fiberboard (MDF) that has a thickness greater than 5 millimeters but not exceeding 9 millimeters. MDF is a panel product made from wood fibers, typically combined with a synthetic resin or binder, and manufactured under high pressure and temperature. The defining characteristic for this particular code is its precise dimensional range, falling between these specified thickness limits.

Distinguishing this category from its siblings is crucial for accurate classification. HTS 4411.12 covers MDF with a thickness of 5 mm or less, while HTS 4411.14 applies to MDF exceeding 9 mm in thickness. Therefore, 4411.13 serves as a distinct threshold, capturing only those MDF panels within the 5 mm to 9 mm thickness range.

Within this category, further subdivisions exist to refine classification. The subcategory 4411.13.10.00 covers MDF that has not undergone any mechanical working (beyond basic cutting or shaping) or surface treatment such as painting, laminating, or veneering. The remaining subcategories, denoted by "Other," would encompass MDF within the specified thickness range that *has* been mechanically worked or surface covered, allowing for more granular tariff application based on these additional processing steps.