Modvat credit for water-treatment chemicals was supported where steam generation formed an essential part of carbon black manufacture.

Caustic soda and hydrochloric acid used in water treatment for steam generation in carbon black manufacture were treated as inputs used in relation to manufacture, because steam production was an essential part of the process and the chemicals supported demineralised water required for the boiler system. Inputs used for an intermediate stage do not lose eligibility merely because they are not part of the final product itself. On limitation, departmental knowledge of the Modvat claim and the assessee's disclosure negated suppression, so the extended period could not be applied.

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Issues: (i) Whether caustic soda and hydrochloric acid used in water treatment for producing steam used in the manufacture of carbon black were admissible inputs for Modvat credit; (ii) Whether the demand was barred by limitation and the allegation of suppression was sustainable.

Issue (i): Whether caustic soda and hydrochloric acid used in water treatment for producing steam used in the manufacture of carbon black were admissible inputs for Modvat credit.

Analysis: The relevant test was whether the items were used in or in relation to the manufacture of the final product. The production of steam was held to be a necessary and essential process in the manufacture of carbon black. De-mineralised water was required for the boiler process, and the use of caustic soda and hydrochloric acid in the demineralisation plant was treated as connected with manufacture, not as a mere maintenance activity. Inputs used for an intermediate product do not cease to qualify where that intermediate product is itself part of the manufacturing process of the final product.

Conclusion: The inputs were admissible for Modvat credit, in favour of the assessee.

Issue (ii): Whether the demand was barred by limitation and the allegation of suppression was sustainable.

Analysis: Once the credit was held admissible on merits, the allegation of suppression lost relevance. In any event, the declaration made by the assessee and the departmental knowledge of the availed Modvat benefit negatived any inference of concealment of vital facts. The extended period could not be invoked on the facts found.

Conclusion: The demand was barred by limitation and the charge of suppression failed, in favour of the assessee.

Final Conclusion: The appeal succeeded both on merits and on limitation, and the assessee was entitled to the relief claimed.

Ratio Decidendi: Inputs used in a process integrally connected with manufacture, including the production of an intermediate product necessary for the final product, qualify as inputs used in relation to manufacture for Modvat credit; where the facts were within departmental knowledge, suppression cannot be inferred to sustain the extended period.

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