HS Code for Carbon refractory bricks

Carbon refractory bricks are classified under HS code 6903.10 because they are refractory ceramic goods designed to withstand extreme temperatures, typically in industrial furnaces or kilns. Chapter 69 covers ceramic products, and heading 6903 applies to other refractory ceramic goods such as retorts, crucibles, and bricks, excluding those made of siliceous fossil meals. The specific subheading 6903.10 is reserved for products containing, by weight, more than 50% of free carbon. This high carbon content, often in the form of graphite or anthracite, provides the bricks with unique thermal conductivity and chemical resistance properties, particularly in reducing atmospheres. Unlike standard ceramic bricks, these are essential in the lining of blast furnaces and aluminum electrolytic cells. The classification is driven by the chemical composition (the 50% threshold) and the intended refractory application. These goods are distinct from non-refractory bricks used in general construction, as they must maintain structural integrity at temperatures where standard materials would melt or degrade.

Products Included

• Carbon-based refractory bricks
• Graphite refractory blocks for furnaces
• Carbon-magnesite bricks (>50% carbon)
• Refractory linings with high free carbon content
• Carbon blocks for electrolytic cells

Common Misclassification

These are often confused with HS code 6815.10, which covers non-ceramic articles of graphite or other carbon. The distinction lies in whether the product is considered a ceramic (fired) or a composite article. They may also be confused with 6902.10 if the magnesium content is high, but the 50% carbon rule takes precedence for 6903.10.

FAQ

What is the HS code for carbon refractory bricks?

The HS code for refractory bricks containing more than 50% free carbon is 6903.10.

What defines a brick as refractory?

A brick is refractory if it is designed to resist high temperatures (usually above 1500°C) without melting or losing strength.