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Dolomite Ramming Mass for Induction Furnaces

Dead-burned dolomite powder mixed for ramming into furnace linings, containing dolime for high-heat applications. This article containing dolomite in dolime form falls under this tariff item, used in steel foundries for ladle and furnace maintenance.

Import Duty Rates by Country of Origin

Origin CountryMFN TariffSurtaxesTotal Effective Rate
🇨🇳China5%—5%
🇲🇽Mexico5%—5%
🇺🇸United States5%—5%
🇩🇪Germany5%—5%
🇯🇵Japan5%—5%

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.

6815.91.10Lower: Free vs 5%

If the ramming mass is formed into refractory bricks, blocks, or tiles for metallurgical coke, iron, or steel production

This sibling item covers refractory constructional products for specific metallurgical uses.

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

• Ensure the ramming mass is a fabricated article, not raw dolomite of Chapter 25

• Provide details on dolime content and furnace application to the CBSA

• Verify that the mass is not excluded as a tool or part of Chapter 82

Related Products under Tariff item 6815.91.90

Chromite Investment Casting Shells

Pre-formed ceramic shells using chromite flour as a stucco material, designed for precision investment casting of aerospace and turbine components. The chromite content qualifies these shells as articles of mineral substances under this tariff item, which covers other articles containing chromite.

Chromite-Magnesite Roofing Granules

Colored granules containing chromite and magnesite applied to asphalt shingles for UV protection and aesthetics. They are classified under 6815.91.90 as other articles containing magnesite or chromite, not excluded by Chapter 68 notes.

Chromite Mullite Composite Refractories

Composite refractory shapes blending chromite and mullite, used in glass tank regenerator checkerwork. The chromite component places these under this tariff item as other articles containing chromite, offering high thermal cycling resistance.

Chromite Sand for Metal Casting Molds

Foundry-grade chromite sand used as a mold facing material in metal casting processes. As a fabricated mineral substance article containing chromite, it falls under this tariff item, providing high thermal stability for precision iron and steel castings.

Dead Burned Magnesite Balls for Sintering

Spherical dead burned magnesite aggregates used as sintering aids in refractory brick production. They are classified under 6815.91.90 as magnesia-containing articles for manufacturing processes, with high density promoting uniform brick formation.

Dolime-Based Heat Insulation Boards

Rigid insulation panels made from dolime aggregates for high-temperature industrial ovens. As fabricated articles containing dolime, they fall under this tariff item, offering a lightweight alternative to fiber insulation in petrochemical applications.