6904.10.00.30 - Heat insulating

This HTS category, 6904.10.00.30, specifically covers ceramic building bricks that are designed and manufactured for their heat-insulating properties. These bricks are intended to reduce heat transfer in construction applications, contributing to energy efficiency. They are typically characterized by their porous structure or the inclusion of insulating materials within their ceramic composition, differentiating them from standard building bricks.

This classification distinguishes itself from its sibling category, 6904.10.00.40 "Other," which would encompass ceramic building bricks not specifically designed for heat insulation. While both fall under the broader heading of building bricks, the defining characteristic here is the explicit functional property of thermal insulation.

As this is a leaf node within the HTS structure, there are no further subcategories to introduce. Therefore, classification within this code hinges on the verification of the heat-insulating nature of the ceramic building brick, distinguishing it from other types of ceramic bricks under heading 6904.