Magnesia Ramming Refractory Mortar
A granular refractory mortar made from dead-burned magnesia and phosphate binders for repairing steel ladle linings. It qualifies for HTS 3816.00.20.50 as an 'other' refractory composition, offering superior slag resistance in steelmaking at temperatures exceeding 1600°C. Applied by pneumatic ramming for quick hot repairs.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as pure magnesite without refractory formulation
Natural magnesite in calcined form is under Chapter 25; requires binders to be a refractory composition.
If containing carbon/graphite additives for specific steel applications
Carbon-containing refractory compositions have dedicated subheadings based on material specs.
If sold as pre-cast magnesia refractory blocks
Finished cast shapes are classified as refractory articles in Chapter 69, not dry mixes.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Include melting point (>1600°C) and slag resistance test reports to confirm refractory status
• Phosphate binders may trigger chemical import regs; prepare EPA notifications if applicable
• Avoid pitfall of bulk misclassification by specifying 'ramming mortar for metallurgical furnaces' on invoices
Related Products under HTS 3816.00.20.50
Basic Refractory Gunning Concrete
Magnesia-spinel based dry gunning mix for basic oxygen furnace repairs. HTS 3816.00.20.50 'other' classification applies for its high lime/magnesia content resisting basic slags up to 1750°C. Applied via high-velocity gunning for minimal downtime.
Alumina-Silicate Patch Refractory Mortar
Quick-setting mortar for patching cracks in rotary kilns, containing mullite and clay. Classified HTS 3816.00.20.50 as other refractory mortar for cement plant use up to 1550°C. Trowel-applied with rapid dry-out capability.
Dolomite-Lime Refractory Ramming Mix
Sintered dolomite with lime binder for ladle impact pads (not pure dolomite ramming). HTS 3816.00.20.50 as other variant for steel ladle bottoms resisting erosion at 1650°C. Provides metallurgical lime addition benefits.
Silicon Carbide Refractory Castable
Castable containing SiC grog for blast furnace tap hole clay guns. HTS 3816.00.20.50 other refractory concrete offers abrasion resistance up to 1600°C. Critical for iron runner maintenance.
Andalusite-Based Refractory Gun Mix
Gunning refractory with andalusite for aluminum reduction cell repairs. HTS 3816.00.20.50 classification for thermal shock resistance to 1500°C. Needle-like crystals enhance mullite formation.
Bauxite Grain Plastic Refractory
Plastic refractory mass with bauxite and phosphate for incinerator hearths. HTS 3816.00.20.50 as other composition, rammed in place up to 1600°C. Self-supporting during heat-up.