Modvat credit and by-product treatment: incidental sulphuric acid did not trigger Rule 57CC reversal of credit.

Rule 57CC does not apply where copper concentrate is wholly used to manufacture copper cathode and sulphuric acid emerges only as an incidental by-product. Credit under Modvat cannot be denied or varied merely because waste, refuse, or a by-product arises, and Rule 57C operates only to the extent inputs are used in exempt final products. The emergence of sulphuric acid did not mean any part of the input was used to produce that by-product as a separate final product, so the input-output equation remained unchanged. The by-product therefore did not trigger reversal of credit or duty liability under Chapter X procedure.

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Issues: Whether Rule 57CC was attracted where copper concentrate was used to manufacture copper cathode, and sulphuric acid emerged only as an incidental by-product cleared without duty under Chapter X procedure.

Analysis: Rule 57CC applies where the same input is used in the manufacture of two final products, one dutiable and the other exempt or nil-rated, and Rule 57C denies credit only to the extent inputs are used in exempt final products. Rule 57D makes it clear that credit is not to be denied or varied merely because waste, refuse, or a by-product arises. The incidental emergence of sulphuric acid in the smelting process did not mean that any part of copper concentrate was used in its manufacture. The only final product manufactured from the input was copper cathode, and the by-product did not alter the input-output equation.

Conclusion: Rule 57CC was not attracted, and no amount equivalent to 8% of the price of sulphuric acid was payable on its clearance under Chapter X procedure.

Final Conclusion: The demand and the impugned order could not be sustained because an incidental by-product arising in the course of manufacture does not trigger denial or reversal of Modvat credit where the input is wholly used in producing the dutiable final product.

Ratio Decidendi: A by-product arising incidentally during manufacture does not amount to a separate final product for the purpose of denying Modvat credit, and Rule 57CC cannot be invoked unless the input is used in the manufacture of both dutiable and exempt final products.

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