Sintered Dolomite Slabs for Glass Furnace Crowns
Large rectangular slabs sintered from dolomite for crown construction in soda-lime glass melting furnaces. These roughly cut, thermally processed slabs are covered by tariff item 2518.20.00 before final refractory shaping.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
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 slabs are further shaped or finished for specific furnace use
Finished refractory articles of dolomite fall under Chapter 69.
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 slabs are only roughly cut and not machined into final shapes
• Provide the sintering process details and dimensions
• Check if the slabs are considered refractory articles under Chapter 69 if further processed
Related Products under Tariff item 2518.20.00
Calcined Dolomite Aggregate for Asphalt Mix
Coarse calcined dolomite aggregate used in hot mix asphalt for road construction, valued for its polished stone value resistance. The calcination process imparts chemical stability beyond natural dolomite, qualifying it under tariff item 2518.20.00.
Calcined Dolomite Filler for Polymer Composites
Micronized calcined dolomite used as a functional filler in polypropylene and PVC compounds to improve stiffness. It is a processed mineral powder in its raw state, not yet incorporated into plastics, so it belongs under tariff item 2518.20.00.
Calcined Dolomite Powder for Refractories
Finely ground calcined dolomite produced by heating dolomite rock to high temperatures to remove volatiles, creating a stable refractory material. This calcined form is distinct from raw dolomite and falls under tariff item 2518.20.00.
Dead Burned Calcined Dolomite for Steel Flux
High-purity calcined dolomite dead-burned at 1700°C+ for use as a fluxing agent in basic oxygen steelmaking converters. The sintering process differentiates it from raw dolomite, placing it under tariff item 2518.20.00.
High Reactivity Calcined Dolomite for Animal Feed
Fine calcined dolomite powder used as a magnesium supplement in ruminant livestock feed. It is a calcined mineral product, not yet formulated as a Chapter 30 medicament or Chapter 31 fertilizer, so it falls under tariff item 2518.20.00.
Magnesia-Dolomite Sinter for Cement Rotary Kilns
Sintered blend of magnesia and calcined dolomite for transition zones in cement kiln linings. The dolomite component is in a calcined/sintered state, and the product is not yet assembled into a refractory article, so it falls under tariff item 2518.20.00.