Spent sulphuric acid classification, Modvat credit reversal, and limitation for duty demand were resolved by binding excise principles.

Spent sulphuric acid was treated as classifiable under Chapter Heading 28.07 by following the Larger Bench view on the same product. Modvat credit taken on inputs used in its manufacture did not require reversal, consistent with the earlier binding decision on that issue. For duty demand under Rule 57-I as it stood before 6-10-1988, the Tribunal applied the principle that a rule cannot override the Act, so the applicable demand period was six months or five years, as the statute permitted. The discussion therefore confirms the operative classification, credit treatment, and limitation approach on these excise issues.

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Issues: (i) Whether spent sulphuric acid was classifiable under Chapter Heading 28.07; (ii) whether Modvat credit taken on inputs used in the manufacture of spent sulphuric acid was required to be reversed; and (iii) whether duty demand under Rule 57-I, as it stood before 6-10-1988, was subject to a six months' or five years' time limit.

Issue (i): Whether spent sulphuric acid was classifiable under Chapter Heading 28.07.

Analysis: The Tribunal followed the Larger Bench view already taken on the same product and accepted the classification adopted there. The conclusion was reached on the basis of the earlier authoritative decision concerning the tariff entry applicable to spent sulphuric acid.

Conclusion: Spent sulphuric acid was classifiable under Chapter Heading 28.07.

Issue (ii): Whether Modvat credit taken on inputs used in the manufacture of spent sulphuric acid was required to be reversed.

Analysis: The Tribunal followed the Larger Bench decision which had held that, for inputs used in the manufacture of spent sulphuric acid, reversal of Modvat credit was not warranted.

Conclusion: Reversal of Modvat credit was not required.

Issue (iii): Whether duty demand under Rule 57-I, as it stood before 6-10-1988, was subject to a six months' or five years' time limit.

Analysis: The Tribunal applied its consistent view that a rule cannot override the Act and that, where there is a conflict between the rule and the statutory provision, the Act prevails. On that basis, the period of limitation for raising demand was treated as six months or five years, as applicable.

Conclusion: The demand was governed by the period of six months or five years, as the case may be.

Final Conclusion: The Revenue's appeals succeeded on the substantive issues decided, and the common order settled classification, credit reversal, and limitation in favour of the Revenue.

Ratio Decidendi: An earlier binding decision on identical excise issues should be followed, Modvat credit need not be reversed where so held for the relevant inputs, and a subordinate rule cannot prevail over the Act when determining the permissible period for raising duty demand.

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