Tariff classification depends on composition and essential characteristics, not end-use, for Amigen under the excise tariff.

Tariff classification of Amigen turned on its composition and essential characteristics, not its use as a dye-fixing agent. Technical evidence showed the product was obtained by chemical synthesis through condensation and lacked the dispersing, wetting or emulsifying properties of an organic surface active agent, so it was not classifiable under T.I. 15AA. The earlier revision order did not govern the later dispute after restructuring of Tariff Entry 15A. The Deputy Chief Chemist's reports were preferred over contrary affidavit evidence, especially where the sampling procedure under Rule 56 of the Central Excise Rules, 1944 was not followed for the private test. Amigen was therefore correctly classified under T.I. 15A(1).

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Issues: Whether the product Amigen was classifiable under T.I. 15AA as an organic surface active agent or under T.I. 15A(1) as an amino plastic, and whether the technical reports and affidavits required acceptance of the assessee's claimed classification.

Analysis: The earlier revision order could not control the later classification dispute after restructuring of Tariff Entry 15A. The technical evidence showed that the product was obtained by chemical synthesis through condensation, and the Deputy Chief Chemist's reports stated that it lacked the characteristics of a surface active agent such as dispersing, wetting or emulsifying properties. The contrary affidavit evidence was not preferred, particularly since the sampling procedure under Rule 56 of the Central Excise Rules, 1944 was not followed for the private test relied upon. The product's use as a dye-fixing agent did not determine classification, because end-use was not relevant and aminoplast resins could also serve that function.

Conclusion: Amigen was correctly classified under T.I. 15A(1), not under T.I. 15AA, and the appeal failed.

Ratio Decidendi: For tariff classification under the relevant excise entry, the decisive factors are the product's composition and essential characteristics, not its end-use, and technical evidence duly supported by the record prevails over contrary private opinion.

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