Excise classification of synthetic resins turned on technical evidence, and Alkyd Resin exemption was upheld over Revenue's challenge.

Synthetic resins claimed as Alkyd Resins were examined for excise exemption under Notification No. 156/65, with the classification turning on technical evidence rather than the respondent's advertising description. The SC noted that the relevant notification granted full exemption to Alkyd Resins, while Maleic and Phenolic Resins attracted concessional duty under Item 15A. On the material before it, including chemical opinions and technical data, the departmental evidence did not support the Revenue's classification case, and later Notification No. 122/71 could not govern the earlier period. The products were not shown to fall outside the exemption, so the challenge to the Tribunal's view failed.

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Issues: Whether the respondent's synthetic resins were entitled to exemption as "Alkyd Resins" under Notification No. 156/65 for the relevant period, or whether they were liable to duty as Maleic or Phenolic Resins.

Analysis: The relevant exemption notification under Rule 8(1) of the Central Excise Rules, 1944 granted full exemption to Alkyd Resins and only concessional duty to Maleic and Phenolic Resins under Item 15A of the First Schedule to the Central Excises and Salt Act, 1944. The classification had to be determined on the basis of the material on record, including chemical opinions and technical data, and not merely on the basis of the respondent's advertising description. The departmental chemists' opinions did not support the Revenue's case generally, and the subsequent Notification No. 122/71 could not govern the earlier relevant period. On the evidence available, there was no adequate basis to disturb the Tribunal's view that the products did not cease to be Alkyd Resins merely because of the advertisement relied on by the Revenue.

Conclusion: The products were not shown to fall outside the exemption as Alkyd Resins, and the Revenue's challenge failed.

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