Tariff classification of styrene butadiene copolymer turns on chapter notes; absence of suppression defeats extended limitation and penalties.

Styrene butadiene copolymer classification depends on the tariff notes and HSN explanatory notes for composite polymers. Where styrene is the predominant monomer and the revenue does not prove, through testing or expert evidence, that the product satisfies the conditions for treatment as synthetic rubber under Chapter 40, classification under Heading 3903 applies rather than Heading 4002. A mere interpretational dispute on tariff classification, without proof of misdeclaration or suppression, does not justify invocation of the extended limitation period, and the same absence of deliberate wrongdoing removes the basis for confiscation, redemption fine and penalties.

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Issues: (i) Whether styrene butadiene copolymer was classifiable under Heading 3903 as polymer of styrene or under Heading 4002 as synthetic rubber; (ii) Whether the demand for differential duty with interest for the extended period was sustainable; (iii) Whether confiscation, redemption fine and penalties were sustainable.

Issue (i): Whether styrene butadiene copolymer was classifiable under Heading 3903 as polymer of styrene or under Heading 4002 as synthetic rubber.

Analysis: Rule 2(b) and Rule 3 of the General Rules for the Interpretation of the First Schedule require classification according to the proper heading and the material giving the essential character where a product is composite. Chapter Note 4 of Chapter 39 covers copolymers where no single monomer predominates by 95% or more, and the HSN explanatory notes specifically include styrene-butadiene copolymers within Heading 3903, while also indicating that only those with substantial butadiene content satisfying Chapter 40 Note 4 fall in Heading 4002. The record showed styrene as the predominant monomer and the revenue had not established, by testing or expert opinion, that the goods satisfied the conditions of Chapter 40 Note 4.

Conclusion: The goods were held classifiable under Heading 3903 and not under Heading 4002, in favour of the assessee.

Issue (ii): Whether the demand for differential duty with interest for the extended period was sustainable.

Analysis: The goods were declared as styrene butadiene copolymer with the grade name in the import documents, and the dispute turned on tariff interpretation and product chemistry. In the absence of a proven misdeclaration or suppression of facts, the prerequisites for invoking the extended period were not established.

Conclusion: The extended-period demand with interest was not sustainable, in favour of the assessee.

Issue (iii): Whether confiscation, redemption fine and penalties were sustainable.

Analysis: Once the classification adopted by the importer was accepted and no deliberate misdeclaration or suppression was proved, the foundation for confiscation, redemption fine and penal consequences did not survive.

Conclusion: Confiscation, redemption fine and penalties were set aside, in favour of the assessee.

Final Conclusion: The appeal succeeded and the impugned order confirming classification under Heading 4002, demand of duty, interest, confiscation, redemption fine and penalties was overturned.

Ratio Decidendi: A composite polymer must be classified by applying the tariff notes and HSN explanatory notes, and where the revenue fails to prove that the goods satisfy the conditions for the claimed synthetic rubber heading, classification under the polymer heading prevails; a mere interpretational dispute without proven suppression does not justify extended limitation or penal consequences.

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