Magnesite Refractory Bricks
High-temperature resistant bricks primarily composed of magnesite, used in lining industrial furnaces and kilns. They fall under HTS 6815.91.00 due to their magnesite content and classification as articles of mineral substances not elsewhere specified. These bricks provide thermal insulation and corrosion resistance in steelmaking and glass production.
Import Duty Rates by Country of Origin
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 manufactured as standardized refractory bricks for furnaces
Fully shaped refractory bricks of magnesia fall under Chapter 69 for ceramics, not Chapter 68 articles.
If imported as raw roasted magnesite powder
Unworked mineral substances are classified in Chapter 25, not as fabricated articles.
If containing asbestos rather than magnesite
Other mineral substance articles shift to asbestos-containing category within the same heading.
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Import Tips & Compliance
• Verify magnesite content exceeds 50% via lab certification to confirm 6815.91.00 classification
• Include furnace lining end-use documentation to avoid misclassification as basic shapes under 6819
• Watch for chromite admixture declarations, as it qualifies but may trigger additional inspections
Related Products under HTS 6815.91.00
Dolomite Ramming Mass for Induction Furnaces
Dead-burned dolomite powder mixed for ramming into furnace linings, containing dolime for high-heat applications. Falls under HTS 6815.91.00 as an article containing dolomite in dolime form. Used in steel foundries for lining induction furnaces.
Magnesia Chrome Refractory Shapes
Preformed refractory blocks combining magnesia and chromite for rotary kilns in cement production. HTS 6815.91.00 applies due to dual magnesite and chromite composition. Offers superior resistance to chemical attack and thermal shock.
Dolime-Based Heat Insulation Boards
Rigid insulation panels made from dolime aggregates for high-temperature industrial ovens. Falls under HTS 6815.91.00 for dolomite/dolime content in fabricated form. Lightweight alternative to fiber insulation in petrochemical plants.
Periclase Furnace Roof Tiles
Curved magnesia tiles for electric arc furnace roofs in steel production. Classified HTS 6815.91.00 for periclase magnesia composition as mineral articles. Designed for extreme temperatures above 1700°C.
Magnesite Ladle Nozzle Inserts
Replaceable inserts for steel ladle nozzles made from dense magnesite. HTS 6815.91.00 for magnesite-based mineral articles used in continuous casting. Ensures controlled molten steel flow.
Chromite Investment Casting Shells
Pre-made ceramic shells with chromite flour stucco for precision investment casting. Under HTS 6815.91.00 for chromite content in foundry articles. Used for aerospace and turbine blade production.