Manufacture under excise law depends on commercial distinctness; galvanisation fails, but corrugation creates a new excisable product.

Galvanisation of plain coils or sheets does not amount to manufacture because it only coats the surface with zinc and does not create a commercially distinct product; it is therefore not independently excisable. Corrugation of plain or galvanised sheets does amount to manufacture because it changes the form, gives rigidity, and produces a commercially different article with a new name, character and use; corrugated sheets are therefore liable to excise duty. Waste and scrap, zinc dross, zinc ash and related by-products arising in the process were also held dutiable, subject to redetermination of the duty quantum by the adjudicating authority.

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Issues: (i) Whether galvanisation of plain coils/sheets amounts to manufacture; (ii) Whether corrugation of plain/galvanised sheets results in manufacture and renders corrugated sheets excisable; (iii) Whether waste and scrap, zinc dross, zinc ash and allied by-products arising in the process are chargeable to duty.

Issue (i): Whether galvanisation of plain coils/sheets amounts to manufacture.

Analysis: Galvanisation only coats the sheet with zinc to prevent oxidation and does not by itself bring into existence a new product having a different identity. The settled position applied by the Court was that galvanisation, by itself, does not satisfy the test of manufacture under excise law.

Conclusion: Galvanisation alone does not amount to manufacture and is not independently excisable on that basis.

Issue (ii): Whether corrugation of plain/galvanised sheets results in manufacture and renders corrugated sheets excisable.

Analysis: Corrugation changes the form of the sheet into a product with ridges and grooves, gives it enhanced rigidity, and makes it fit for a different use such as roofing. The process brings into existence a commercially different article with a distinct name, character and use. Applying the settled test of manufacture, the process is not merely incidental but results in a new excisable product.

Conclusion: Corrugation amounts to manufacture and corrugated sheets are liable to excise duty.

Issue (iii): Whether waste and scrap, zinc dross, zinc ash and allied by-products arising in the process are chargeable to duty.

Analysis: The by-products were held to be dutiable, and the exemption claimed for waste and scrap arising in the course of manufacture of exempted goods was not accepted on the facts found. The Court therefore sustained duty liability on these items and directed redetermination of the quantum of duty by the adjudicating authority.

Conclusion: Waste and scrap and the related by-products are chargeable to duty, subject to redetermination of duty by the adjudicating authority.

Final Conclusion: The challenge succeeded only to the limited extent of penalty, while the substantive duty liability on corrugated products and the by-products was upheld and the matter was sent back only for quantification of duty.

Ratio Decidendi: A process amounts to manufacture when it brings into existence a commercially distinct product with a different name, character and use; galvanisation alone does not meet that test, but corrugation does when it transforms plain sheets into a new excisable commodity.

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