HS Code for Insulating bricks

HS code 6901.00 is a specific classification for ceramic goods, including bricks, blocks, and tiles, that are manufactured from siliceous fossil meals. These materials, which include kieselguhr, tripolite, and diatomite, are composed of the remains of microscopic organisms and are known for their exceptionally high silica content and naturally porous structure. These physical properties make the resulting ceramic products excellent thermal insulators, capable of withstanding high temperatures while preventing heat loss. The classification under 6901.00 is determined by the chemical and mineralogical composition of the raw material rather than just the shape or use of the final product. During manufacturing, these siliceous earths are typically mixed with binders, shaped, and then fired to create a lightweight, heat-resistant material. These bricks are primarily used in the construction of industrial furnaces, kilns, and boilers where thermal efficiency is paramount. It is critical to distinguish these from other refractory bricks classified under heading 6902. While 6902 covers bricks made from alumina, silica (in other forms), or magnesia, 6901.00 is exclusively for those made from siliceous fossil meals. The distinction is vital because the trade regulations and duties can vary significantly between these categories.

Products Included

• Kieselguhr insulating bricks
• Diatomite heat-insulating blocks
• Siliceous fossil meal tiles
• Lightweight insulating ceramic slabs
• Porous siliceous earth blocks for furnace linings

Common Misclassification

The most common misclassification occurs with heading 6902, which covers refractory bricks. While both are used in high-heat environments, 6902 is for bricks that are primarily heat-resistant (refractory) but not necessarily made from fossil meals. Another common error is using 6806, which covers mineral wools and expanded mineral materials. If the product is a fired ceramic, it must stay in Chapter 69. Standard building bricks made of common clay are classified under 6904.10 and should not be confused with these specialized insulating materials.

FAQ

What is the HS code for insulating bricks?

The HS code for insulating bricks made of siliceous fossil meals is 6901.00.

Are these the same as firebricks?

Not necessarily. Firebricks are usually refractory bricks classified under 6902; 6901.00 is specifically for those with high insulation properties made from fossil meals.