Sintered Dolomite Slabs for Glass Furnace Crowns
Large rectangular slabs sintered from dolomite for crown construction in soda-lime glass melting furnaces. HTS 2518.20.00.00 applies to these roughly cut, thermally processed slabs before final refractory shaping.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing >50% alumina after firing
High-alumina refractory products exceed Chapter 25 mineral composition limits.
If merely saw-cut without sintering
Thermal processing requirement distinguishes sintered slabs from trimmed blocks.
If chemically prepared with fluxes
Prepared chemical products of dolomite exclude natural mineral forms.
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Import Tips & Compliance
• Include slab thickness measurements (<0.508mm excludes mica definitions but confirms dolomite)
• Certify no precious stone content per Chapter exclusions for tariff validity
• Ship on pallets as industrial slabs, not finished articles, to stay in Chapter 25
Related Products under HTS 2518.20.00.00
Calcined Dolomite Powder for Refractories
Finely ground calcined dolomite produced by heating dolomite rock to high temperatures, removing volatiles to create a stable refractory material. Classified under HTS 2518.20.00.00 as calcined dolomite, distinct from mere crushed stone, specifically used in steelmaking furnaces and cement production.
Sintered Dolomite Blocks for Kiln Linings
Rectangular blocks of dolomite sintered at high temperatures to achieve dense, heat-resistant structure for industrial furnace linings. Falls under HTS 2518.20.00.00 due to sintering process on roughly trimmed dolomite slabs, used primarily in lime kilns and glass manufacturing.
Dead Burned Calcined Dolomite for Steel Flux
High-purity calcined dolomite dead-burned at 1700°C+ for use as fluxing agent in basic oxygen steelmaking converters. HTS 2518.20.00.00 covers this sintered/calcined form, differentiated from raw dolomite by its reactivity and thermal stability.
Calcined Dolomite Aggregate for Asphalt Mix
Coarse calcined dolomite aggregate used in hot mix asphalt for road construction due to polished stone value resistance. Classified in 2518.20.00.00 as the calcination imparts specific chemical stability beyond natural crushed stone.
High Reactivity Calcined Dolomite for Animal Feed
Fine calcined dolomite powder providing magnesium supplement for ruminant livestock feeds. Under 2518.20.00.00 as calcined mineral product, not yet a Chapter 31 fertilizer or Chapter 30 medicament.
Magnesia-Dolomite Sinter for Cement Rotary Kilns
Sintered blend of magnesia and calcined dolomite for transition zones in cement kiln linings. HTS 2518.20.00.00 captures the dolomite component's calcined/sintered state before final refractory assembly.