Calcined Mullite Aggregate
> Calcined mullite aggregate consists of crushed and heat-treated mullite grains used as a raw material in high-temperature refractories and castables. The product is processed only by crushing and heat treatment, which is permitted under Chapter 25 notes. It is classified under tariff item 2508.60.00 as mullite.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| π¨π³China | Free | β | Free |
| π²π½Mexico | Free | β | Free |
| πΊπΈUnited States | Free | β | Free |
| π©πͺGermany | Free | β | Free |
| π―π΅Japan | Free | β | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the aggregate contains significant chamotte or dinas earth components
Chamotte or dinas earths are classified separately.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item β and can price the duty on it in the same conversation.
Import Tips & Compliance
β’ > Provide a detailed product specification showing the mullite content and particle size distribution
β’ Keep records of the heat treatment process to demonstrate compliance with Chapter 25 processing limits
Related Products under Tariff item 2508.60.00
Bauxite-Derived Calcined Mullite
> Bauxite-derived calcined mullite is produced by calcining bauxite to form the mullite phase, a high-alumina refractory material. It is used in abrasive refractories and high-temperature applications. This product falls under tariff item 2508.60.00 as mullite, distinct from raw bauxite ores, and is not excluded by Chapter 25 notes.
Fused Mullite Grain 200 Mesh
> Fused mullite grain in 200 mesh size is produced by electrical fusion of alumina and silica, resulting in a high-purity mullite material. It is used in precision casting molds and advanced ceramics. Fusion is a mechanical/physical process that does not exclude it from Chapter 25, so it falls under tariff item 2508.60.00.
High Purity Mullite for Investment Casting
> High purity mullite for investment casting is specially graded to provide thermal stability and low thermal expansion in casting shells. It is a processed mullite earth used in industrial refractory applications. This product is classified under tariff item 2508.60.00 as mullite.
Micronized Mullite Flour
> Micronized mullite flour with a D50 below 5 ΞΌm is a fine powder used as a filler in technical ceramics and casting slips. It is processed by grinding, which is allowed under Chapter 25 notes. It remains under tariff item 2508.60.00 as processed mullite powder.
Mullite Chamotte Grogs
> Mullite chamotte grogs are fired and crushed mullite particles used as aggregate in refractory brick formulations. They are processed by firing and crushing, which are permitted mechanical processes. This product is classified under tariff item 2508.60.00 as mullite, alongside chamotte or dinas earths.
Synthetic Mullite Powder
> Synthetic mullite powder is a high-alumina ceramic material produced by sintering or fusing alumina and silica. It is used primarily in refractory applications. The product is mullite by definition and falls under tariff item 2508.60.00, as it is not excluded by Chapter 25 notes.