Calcined Dolomite Filler for Polymer Composites
Micronized calcined dolomite used as functional filler in polypropylene and PVC compounds for improved stiffness. Classified 2518.20.00.00 as processed mineral powder, prior to plastics incorporation.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If ultra-high purity chemical grade
Pharmaceutical/chemical calcium carbonate exceeds mineral purity.
If compounded >50% into plastics
Plastic materials incorporating fillers become Chapter 39 polymers.
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Import Tips & Compliance
• D50 particle size analysis confirms filler grade vs coarse aggregates
• Surface treatment certificates if stearate-coated to avoid 3824 classification
• Bulk density tests distinguish from built-up mica splittings
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.
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.
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.