Mullite-Forming Kyanite Concentrate
Beneficiated kyanite concentrate with 99%+ purity, selected for optimal mullite formation during firing. This uncalcined kyanite has been processed by mechanical or physical methods only, placing it under tariff item 2508.50.00 per Chapter 25 definitions.
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 concentrate is further processed into mullite
Mullite is a separate product under the same heading, distinct from kyanite.
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
• Document the beneficiation process (e.g
• flotation, magnetic separation) to show it is a mechanical or physical process allowed under Chapter 25
• Keep purity certificates to support the high alumina content claim
• If the concentrate is calcined, ensure the tariff item still applies as calcined kyanite is covered
Related Products under Tariff item 2508.50.00
Calcined Andalusite 55% Al2O3
Calcined andalusite with 55% alumina content, heat-treated to partially convert to mullite for improved thermal shock resistance. This product falls under tariff item 2508.50.00 as calcined andalusite, which is explicitly covered by the heading regardless of calcination.
Calcined Kyanite Powder
Calcined kyanite powder, heat-stabilized to prevent volume expansion during ceramic firing. As a calcined form of kyanite, it is explicitly included in tariff item 2508.50.00, which covers andalusite, kyanite and sillimanite whether or not calcined.
Indian Sillimanite Sand
Indian sillimanite sand, washed and dried to -100+200 mesh, sourced from beach sand deposits. This naturally concentrated sillimanite is covered by tariff item 2508.50.00, which includes sillimanite in its crude or processed state as long as processing is limited to washing, drying, or mechanical sizing.
Kyanite Flour -325 Mesh
Kyanite flour ground to -325 mesh (<44 microns), used as a filler in porcelain insulators and spark plugs. This ground kyanite is classified under tariff item 2508.50.00 as it has only been mechanically ground, which is permitted processing under Chapter 25 notes.
Raw Andalusite Ore
Raw andalusite ore consisting of natural crystals extracted from deposits, containing 55-60% alumina. This uncalcined andalusite is directly covered by tariff item 2508.50.00, which includes andalusite in its crude state without further processing.
Sillimanite Grain for Refractories
Sillimanite grains, crushed and sized for use in refractory castables and ramming mixes. This unprocessed sillimanite, valued for high alumina content, falls under tariff item 2508.50.00 as sillimanite in a crushed or ground state, which is permitted under Chapter 25.