Popular trade meaning governs tariff classification of block board, excluding similar laminated wood under the competing heading.

Where tariff expressions are undefined, classification turns on their popular and trade meaning, supported by statutory notes and commercial usage. On that basis, block board was held distinct from similar laminated wood: laminated wood consists of layers with parallel grains, while block board has a core of wood strips between outer veneers with the grain at right angles. The HSN explanatory notes were treated as persuasive only and could not override the tariff language. Block board was therefore classifiable under Heading 4410.90, not Heading 4408.90, and the assessee succeeded.

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Issues: Whether block board manufactured by the appellants was classifiable under Heading 4410.90 as articles of wood not elsewhere specified, or under Heading 4408.90 as similar laminated wood.

Analysis: The tariff did not define block board or laminated wood, so the expressions had to be construed in their popular and trade sense. The Indian Standards glossary showed that laminated wood and block board are different products: laminated wood consists of layers of wood and adhesive with parallel grains, whereas block board has a core of strips of wood between outer veneers with the grain at right angles to the veneers. The HSN explanatory notes, though persuasive, could not override the tariff language and supporting statutory notes. The trade evidence was not established by the Department, while the ISI definitions and the structure of the tariff supported treatment of block board as distinct from similar laminated wood. The earlier excise notification treating block boards with flush doors also supported classification under the residuary wood heading.

Conclusion: Block board was not classifiable under Heading 4408.90 and fell under Heading 4410.90. The issue was decided in favour of the assessee.

Final Conclusion: The appeals were allowed and the classification adopted by the lower authorities was set aside in favour of the appellants.

Ratio Decidendi: Where tariff expressions are undefined, classification must be determined by their popular and trade meaning, and persuasive HSN notes cannot displace the ordinary commercial understanding or the tariff language.

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