HS 250850 Andalusite, kyanite and sillimanite
Quick Answer: HS code 250850 covers andalusite, kyanite, and sillimanite – naturally occurring aluminum silicate minerals primarily used in refractory applications due to their high melting points and resistance to thermal shock. These minerals are crucial for manufacturing ceramics, kiln furniture, and other high-temperature industrial products. For importers and exporters, a significant trade consideration is the consistent duty-free status across major jurisdictions. The UK Trade Tariff, EU TARIC, and the US Harmonized Tariff Schedule (HTSUS) all list a 0.00% ad valorem duty rate for products classified under 250850. This widespread duty-free treatment simplifies customs clearance and reduces import costs, making these essential industrial minerals readily accessible in international trade.
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2508500000 | 0.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2508500000 | 0.00 % | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2508500000 | Free | — | ["t"] |
Duty rates sourced from the USITC (US International Trade Commission) Harmonized Tariff Schedule (HTS) (accessed 2/22/2026), EU TARIC – DG TAXUD (Directorate-General for Taxation and Customs Union) (accessed 2/22/2026), and UK Trade Tariff – HMRC (His Majesty's Revenue and Customs) (accessed 2/22/2026).
Data compiled and presented by HSRates.
How Has Trade Volume Developed?
How to Classify This HS Code?
What products does HS 250850 cover?
This subheading covers andalusite, kyanite, and sillimanite, which are naturally occurring anhydrous aluminum silicates. These minerals are polymorphs, sharing the same chemical formula (Al2SiO5) but possessing distinct crystal structures and physical properties. The WCO Harmonized System Explanatory Notes for Heading 2508 confirm that these specific minerals, when uncalcined, are classified here. The USITC Harmonized Tariff Schedule (HTS) and the EU TARIC system both align with this scope, classifying these industrial minerals primarily used in the refractories industry due to their high melting points and resistance to chemical attack, typically imported in crude, crushed, or ground forms.
What falls outside HS 250850?
The following products are excluded from HS 250850: calcined or otherwise heat-treated forms of andalusite, kyanite, or sillimanite, which are classified under Heading 250890 as "Other clays." For instance, calcined kyanite, often referred to as mullite, undergoes a transformation at high temperatures and is specifically excluded from this subheading. Furthermore, synthetic mullite, which is manufactured rather than naturally occurring, is classified under Chapter 69, typically subheading 6903. Similarly, other refractory clays like fireclay (kaolinitic clay) or bentonite, even if used for similar purposes, are classified elsewhere within Heading 2508 or Chapter 25, depending on their specific composition and processing.
What are common classification mistakes for HS 250850?
A common error is misclassifying calcined forms of andalusite, kyanite, or sillimanite under HS 250850. Importers often overlook the distinction between the raw, uncalcined minerals and their heat-treated derivatives, which are specifically directed to HS 250890 or even Chapter 69 if they have been transformed into mullite. This mistake violates General Rule of Interpretation (GRI) 1, which dictates classification according to the terms of the headings and any relative section or chapter notes, and GRI 6, which applies the same principles at the subheading level. Another frequent error involves confusing these specific aluminum silicates with other refractory minerals or clays that do not share the exact chemical and mineralogical characteristics.
How should importers classify products under HS 250850?
The correct procedure for classifying products under HS 250850 involves verifying that the imported material is indeed uncalcined andalusite, kyanite, or sillimanite. Importers and customs brokers should obtain detailed technical specifications, including mineralogical analyses and processing descriptions, from the supplier. Crucially, confirm that the material has not undergone any heat treatment that would alter its mineralogical structure, such as calcination. Reference the WCO Explanatory Notes for Heading 2508 and cross-reference with the specific wording in the USITC HTS or EU TARIC for subheading 250850. If there is any doubt regarding the processing or identity, consider requesting a binding ruling from the relevant customs authority to ensure compliance and avoid potential penalties.
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FAQ
What is the Most Favored Nation (MFN) import duty rate for HS 2508.50 (Andalusite, kyanite, and sillimanite) in major markets?
For HS 2508.50, the Most Favored Nation (MFN) import duty rate is generally 0.00% ad valorem in key markets. For instance, the Harmonized Tariff Schedule of the United States (HTSUS) under subheading 2508.50.00 provides for a 'Free' (0.00%) general duty rate. Similarly, the EU TARIC (Integrated Tariff of the European Union) for CN code 2508 50 00 indicates a conventional duty rate of 0.00%. The UK Global Tariff also lists '0% ad valorem' for this heading. Importers should always verify the current rates directly with the official tariff schedules of the importing country (e.g., USITC HTSUS, EU TARIC, UK Trade Tariff).
Are there any preferential duty rates available for HS 2508.50 under common trade agreements?
Yes, due to the MFN duty rate of 0.00% for HS 2508.50 in many major economies, the preferential duty rates under various trade agreements are also typically 0.00% or 'Free'. For example, under agreements such as the USMCA (United States-Mexico-Canada Agreement), EU-Japan EPA, or various Generalized System of Preferences (GSP) schemes, goods classified under 2508.50 originating from eligible countries would enter duty-free. Importers must ensure they meet the specific Rules of Origin requirements of the respective trade agreement and provide proper documentation (e.g., a certificate of origin) to claim preferential treatment, even if the MFN rate is already zero.
What are the key classification criteria for Andalusite, kyanite, and sillimanite under HS 2508.50?
HS 2508.50 specifically covers 'Andalusite, kyanite and sillimanite'. These are naturally occurring aluminum silicate minerals primarily used in refractories due to their high melting points and resistance to thermal shock. The classification hinges on the mineralogical identity of the product. Importers must ensure that the product is indeed one of these three specified minerals and not a mixture or a processed derivative that might fall under a different heading (e.g., prepared refractories of Chapter 69). The WCO Explanatory Notes for Chapter 25 provide guidance that this heading includes these minerals whether in crude form, crushed, ground, or powdered, but not calcined or further processed beyond simple preparation for use.
What documentation is typically required for importing goods classified under HS 2508.50?
Standard import documentation is required for HS 2508.50. This generally includes a commercial invoice, packing list, bill of lading or air waybill, and a customs declaration form. While specific permits or licenses are uncommon for these raw minerals, importers should verify if any country-specific environmental, health, or safety regulations apply, especially concerning dust or particulate matter. If claiming preferential duty rates under a free trade agreement, a valid Certificate of Origin or Origin Declaration is mandatory. Customs brokers will require accurate product descriptions and potentially technical specifications or assay reports to confirm the mineral identity for classification purposes.