High-Magnesia Carbon Kiln Blocks
High-magnesia carbon kiln blocks are heavy-duty refractory blocks with over 70% magnesia and controlled carbon under 30%, resin-bonded for cement kiln transition zones. They withstand abrasion and alkali attack in high-temperature industrial processes. These blocks fall under tariff item 6810.11.00 as building blocks of artificial stone.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | 3% | — | 3% |
| 🇲🇽Mexico | 3% | — | 3% |
| 🇺🇸United States | 3% | — | 3% |
| 🇩🇪Germany | 3% | — | 3% |
| 🇯🇵Japan | 3% | — | 3% |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the blocks are specifically designed for kiln linings and contain magnesia
Refractory bricks and blocks for kilns fall under heading 69.02 when they meet the refractory criteria.
If the blocks are not standard building blocks but custom refractory shapes
Heading 68.15 covers other articles of mineral substances, including specialized refractory blocks.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Confirm the carbon content is below 30% and magnesia exceeds 70% to align with the tariff item
• Keep technical datasheets available for CBSA verification
• Consider whether the blocks are classified as refractory goods under Chapter 69 if they are kiln-specific
Related Products under Tariff item 6810.11.00
Architectural Concrete Screen Blocks
Architectural concrete screen blocks are precast concrete units with decorative geometric openings, used for privacy screens and building facades. They are made from cement, aggregates, and water, and are not reinforced, qualifying them as building blocks of concrete under tariff item 6810.11.00.
Autoclaved Aerated Concrete (AAC) Blocks
Autoclaved aerated concrete (AAC) blocks are lightweight precast concrete units containing air voids, produced with cement, lime, sand, and an expanding agent, then steam-cured under pressure. They are used for wall construction and insulation, and meet the definition of building blocks of concrete under tariff item 6810.11.00.
Carbon-Magnesia Converter Bricks
Carbon-magnesia converter bricks are refractory bricks containing over 70% magnesia and up to 29% carbon, bonded with pitch for use in basic oxygen furnace (BOF) converter mouths and trunnions. Their high magnesia content provides oxidation resistance and durability in extreme steelmaking conditions. They are classified under tariff item 6810.11.00 as building blocks and bricks of artificial stone.
Cement Sandwich Building Blocks
Cement sandwich building blocks consist of a concrete core with insulating foam layers bonded by cement, used for energy-efficient wall construction. They are composite concrete blocks, not reinforced, and are classifiable as building blocks under tariff item 6810.11.00.
Concrete Corner Blocks
Concrete corner blocks are angled precast concrete blocks designed for clean wall corners in construction. They are unreinforced and used in masonry applications to create neat edges. These blocks are classified under tariff item 6810.11.00 as building blocks and bricks of artificial stone.
Concrete Curbing Blocks
Concrete curbing blocks are precast concrete blocks shaped for edging lawns, driveways, and paths, providing a stable border. They are unreinforced and used in landscaping construction. These blocks are classified under tariff item 6810.11.00 as building blocks of artificial stone.