Magnesia-Chrome Refractory Bricks
High-density refractory bricks composed of more than 50% MgO and Cr2O3, fired after shaping to withstand extreme temperatures in industrial furnaces. These bricks are used in rotary kilns and non-ferrous metal smelters for their superior corrosion resistance. Classified under HTS 6902.10.50.00 due to high magnesium and chromium oxide content and refractory properties.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing >50% alumina (Al2O3)
High-alumina refractories shift to 6902.20 due to different oxide composition dominating over Mg/Ca/Cr.
If not exceeding 50% MgO/CaO/Cr2O3 but containing >30% Al2O3
Lower Mg/Ca/Cr content with significant alumina moves to other refractory bricks in 6903.
If made from carbon or graphite-based materials
Carbon refractories fall under Chapter 68, not fired ceramic goods of Chapter 69.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Verify chemical composition certificates showing >50% MgO, CaO or Cr2O3 to confirm classification and avoid reclassification to lower-duty codes
• Ensure firing temperature records exceed 800°C as per Chapter 69 notes to distinguish from non-refractory ceramics
• Comply with EPA hexavalent chromium regulations for chrome-containing refractories during import declaration
Related Products under HTS 6902.10.50.00
Magnesia-Herringbone Refractory Bricks
Herringbone-patterned magnesia bricks with >50% MgO for improved gas flow in tunnel kilns and reheating furnaces. The angled design prevents brick movement under thermal cycling. HTS 6902.10.50.00 classification for magnesium refractory bricks.
Rebonded Fused Magnesia Chrome Bricks
Ultra-high purity bricks made from rebonded fused magnesia-chrome grains with aggregate >50% MgO/Cr2O3, for electric arc furnace roofs. Exceptional service life in severe conditions. Covered by HTS 6902.10.50.00 as premium refractory bricks.
High Purity Magnesia Refractory Shapes
Custom-shaped refractory components with 95%+ MgO content for specialized furnace zones like ladle impact pads. Precision fired to maintain dimensional stability. HTS 6902.10.50.00 for high magnesium oxide refractory goods.
Calcium Ferrite Refractory Bricks
Refractory bricks incorporating calcium ferrite phases with >50% CaO equivalent for waste incinerator linings. Resistant to alkali corrosion from flue gases. Classifies HTS 6902.10.50.00 for high calcium oxide refractories.
Magnesia-Dolomite Composite Refractory Blocks
Composite blocks blending magnesia and dead-burned dolomite achieving >50% combined MgO/CaO for basic oxygen furnace linings. Balanced chemistry for steelmaking slags. HTS 6902.10.50.00 classification applies.
Chromium-Corundum Refractory Bricks
High-chrome corundum bricks with Cr2O3>50% for glass furnace superstructures resisting batch carryover. Dense microstructure prevents glass penetration. Covered by HTS 6902.10.50.00 for chromium oxide dominant refractories.