CESTAT Mumbai Ruled on Proper Customs Classification of Calcined Aluminium Silicate (Kaolin Clay) under CTI 2507 0029

Aadrikaa Legal Services (ALS) – IDT Tax I Arbitration I Litigation

Date: 27.06.2026

CESTAT Mumbai Ruled on Proper Customs Classification of Calcined Aluminium Silicate (Kaolin Clay) under CTI 2507 0029

A recent decision by the Customs, Excise & Service Tax Appellate Tribunal (CESTAT) Mumbai has clarified the customs classification of calcined aluminium silicate, commonly known as kaolin clay. The case, Omya India Private Limited vs. Commissioner of Customs (NS-I), revolved around the correct tariff heading for imported calcined kaolin clay and its implications for customs duty.

Background of the Dispute

Omya India Private Limited, a manufacturer and distributor of industrial minerals, imported ‘Burgess Calcined Aluminium Silicate’ from the USA. The company classified the product under Customs Tariff Item (CTI) 2507 0029, claiming a duty exemption. However, customs authorities, after laboratory testing, reclassified the product under CTI 2839 9090, resulting in a higher duty liability. Omya paid the differential duty under protest and appealed the classification.

Key Issues in the Case

1. Nature of the Product:
   • The imported material is commercially known as kaolin clay or China clay, widely used as a filler in paints, plastics, and coatings.
   • The supplier confirmed it is natural aluminium silicate, processed by washing, spray drying, and calcination, but not chemically altered.
2. Customs Classification Dispute:
   • Omya’s Claim: CTI 2507 0029 (Kaolin and other kaolinic clays, whether or not calcined)
   • Customs’ Position: CTI 2839 9090 (Other silicates under inorganic chemicals)
3. Laboratory Findings:
   • The Central Revenue Control Laboratory (CRCL) found the product to be mainly aluminium silicate with trace elements, described as processed calcined clay.

Legal Analysis by the Tribunal

Customs Tariff Structure

• Chapter 25: Covers mineral products like kaolin clay, including those that are calcined, provided they have not undergone chemical alteration beyond certain physical processes.
• Chapter 28: Applies to separate chemical elements and chemically defined compounds, such as specific silicates.

Tribunal’s Reasoning

• The Tribunal emphasized that calcined kaolin clay remains classifiable under Chapter 25, as long as its structure is not chemically altered.
• The supplier’s documentation and laboratory results confirmed the product was natural kaolin clay, merely processed by calcination.
• The Tribunal cited the Supreme Court’s decision in 20 Microns Limited, which held that calcined kaolin clay should remain under Chapter 25.

Final Decision

• The CESTAT set aside the customs authorities’ reclassification and ruled that Omya’s product should be classified under CTI 2507 0029.
• The appeal was allowed in favor of Omya India Private Limited, restoring their eligibility for the duty exemption.

Implications of the Ruling

1. Clarity for Importers:
   • The decision provides clear guidance for importers of calcined kaolin clay regarding its tariff classification and eligibility for exemptions.
2. Precedent Value:
   • The ruling reinforces the principle that physical processing like calcination does not alter the customs classification of kaolin clay.
3. Reference for Future Disputes:
   • The case sets a precedent for similar disputes, aligning Indian customs practice with international norms and Supreme Court jurisprudence.

Conclusion

The CESTAT Mumbai’s decision in the Omya India case is a significant development for the minerals and chemicals industry. It underscores the importance of accurate product classification and the role of judicial precedents in resolving complex customs disputes. Importers dealing with processed minerals can now rely on this ruling for greater certainty in their customs operations.

Source: CESTAT Mumbai

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