Manufacture by transformation of bitumen to blown bitumen: commercially distinct product, excise duty applies, exemption denied.

Converting straight grade bitumen into blown bitumen amounts to manufacture because the blowing process creates a commercially and functionally distinct product with different character, use and identity. The fact that both materials may fall under the same tariff item does not prevent excise liability where a new excisable commodity emerges. On that basis, blown bitumen was held liable to central excise duty, and the exemption under Notification No. 77/83 was unavailable because the clearance threshold was exceeded.

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Issues: Whether the process of converting straight grade bitumen into blown bitumen amounted to manufacture so as to render the resultant product dutiable under the central excise tariff and disentitle the assessee from the exemption under Notification No. 77/83.

Analysis: Bitumen in its straight grade form and blown bitumen are not the same commodity in commercial and functional terms. The blowing process brings about chemical changes in the material, increases the softening point, reduces ductility, and produces a product suited for uses different from the starting material. A new excisable commodity emerges when the process results in a distinct product with a separate character, use and commercial identity. The fact that both the starting material and the finished product may fall under the same tariff item does not prevent the process from amounting to manufacture or affect duty liability. Since the aggregate value of clearances of excisable goods exceeded the threshold prescribed by the notification, the assessee could not claim the exemption.

Conclusion: The conversion of straight grade bitumen into blown bitumen constituted manufacture, blown bitumen was liable to excise duty, and the assessee was not entitled to exemption under Notification No. 77/83.

Final Conclusion: The duty demand and denial of exemption were sustained, and the appeal failed.

Ratio Decidendi: A process that produces a commercially distinct commodity with a different character, use and identity amounts to manufacture even if the new product remains classifiable under the same tariff item as the original material.

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