HSN-based tariff classification follows explanatory notes; trade parlance cannot override clear tariff wording for silicon products.

Tariff classification under an HSN-based tariff was held to follow the tariff entry read with the HSN explanatory notes. On that basis, goods described by their composition as silicon oils and related preparations, including a product described as 100% silicon, were classified under Heading 39.10 as silicon in primary form, not under Heading 84.46 as electrical insulators, because the latter heading was confined to insulators used for fixing, supporting and electrically isolating conductors. Where the tariff description was clear, trade parlance and dictionary meaning could not override the tariff text and explanatory notes.

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Issues: (i) Whether the products in question were classifiable under Heading 39.10 as silicon in primary form or under Heading 84.46 as electrical insulators. (ii) Whether trade parlance and dictionary meaning could override the tariff description and explanatory notes for classification.

Issue (i): Whether the products in question were classifiable under Heading 39.10 as silicon in primary form or under Heading 84.46 as electrical insulators.

Analysis: The tariff entry for silicon in primary form was construed in the light of the Harmonised System of Nomenclature, since the Indian Tariff followed the HSN and there was no contrary indication. The explanatory notes showed that silicon in primary form included silicon oils, greases, resins and elastomers. On the descriptions and composition of the goods, the products were found to be silicon oils and related preparations, and one product described as 100% silicon was also within Chapter 39. The heading for electrical insulators was found to be confined to insulators used for fixing and supporting electrical conductors and insulating them physically from each other and from earth, which did not cover the assessees' products.

Conclusion: The goods were correctly classifiable under Heading 39.10 and not under Heading 84.46.

Issue (ii): Whether trade parlance and dictionary meaning could override the tariff description and explanatory notes for classification.

Analysis: Where the tariff description itself provides sufficient guidance, recourse to dictionary meaning or trade parlance is unnecessary. The classification had to follow the tariff entry and the HSN explanatory notes, which supported classification under Heading 39.10.

Conclusion: Trade parlance and dictionary meaning could not displace the tariff-based classification.

Final Conclusion: The revenue appeal succeeded and the classification adopted by the Assistant Collector was restored.

Ratio Decidendi: For tariff classification under a tariff based on the HSN, the expression in the tariff entry must be construed in accordance with the HSN explanatory notes, and where the tariff description is clear, trade parlance and dictionary meaning need not be applied.

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