Commercial parlance and end use govern tariff classification where goods are known in trade as electrical insulators.

Tariff classification of paper based synthetic resin bonded insulator sheets and boards turned on commercial parlance, trade understanding and functional identity, not material composition alone. The record indicated that the product was known in the market as an electrical insulator, and the test report did not displace that character. On that basis, the competing heading for laminated plastic sheets was not preferred, because end use and commercial description remained relevant in resolving the classification dispute. The goods were therefore classified under the electrical insulator heading rather than as laminated plastic sheets.

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Issues: Whether the respondent's product, described as paper based synthetic resin bonded insulator sheets and boards, was classifiable under sub-heading 8546.00 as electrical insulators or under sub-heading 3920.31 as laminated plastic sheets.

Analysis: The classification depended not merely on the material composition or the departmental view that the goods answered the description of laminated plastic sheets, but also on how the goods were known in trade and in commercial understanding. The record showed that the product was understood in the market as an electrical insulator, and the test report did not conclusively negate that character. The principle applied was that commercial parlance and trade description are relevant and often decisive in classification, and the end use of the goods could not be ignored where the competing headings and market identity pointed to the electrical insulator heading.

Conclusion: The goods were correctly classifiable under sub-heading 8546.00, and not under sub-heading 3920.31.

Ratio Decidendi: For tariff classification, the commercial identity and trade understanding of the goods may be decisive, especially where the product is known in the market by its functional use as an electrical insulator.

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