6806.90.00 - Other

This classification, 6806.90.00, encompasses a broad range of heat-insulating, sound-insulating, or sound-absorbing mineral materials and articles thereof, which do not fit into the more specific categories of slag wool, rock wool, similar mineral wools (6806.10), or exfoliated vermiculite, expanded clays, foamed slag, and similar expanded mineral materials (6806.20). This "other" category is intended for products that are derived from similar mineral bases but are processed or presented in a manner distinct from those specifically enumerated under headings 6806.10 and 6806.20, or those of headings 6811 or 6812, or chapter 69.

The primary distinction from its sibling categories lies in the form and composition of the materials. While 6806.10 deals with bulk, sheets, or rolls of mineral wools, and 6806.20 covers expanded forms of vermiculite, clays, and slag, this heading captures other manufactured articles or mixtures utilizing these or similar mineral materials for their insulating properties. The emphasis here is on articles or processed forms that are not simply the raw or expanded mineral masses themselves but rather integrated products designed for specific insulation applications.

Within this "other" category, further subdivisions exist to refine classification. The subcategory 6806.90.00.10 specifically addresses acoustical pads and boards, highlighting their intended use in sound absorption and management. The remaining "other" subcategories would capture a variety of other manufactured articles or mixtures that utilize mineral-based insulation materials for thermal or acoustic purposes, where the form or specific application does not align with the more narrowly defined preceding headings.