Physical or chemical analysis classification governs an oscillating disc rheometer, with exemption available under the notification.

An oscillating disc rheometer designed to monitor processing and vulcanisation characteristics of compounded rubber, and to generate a rheograph showing cure and final product properties, was treated as an instrument for physical or chemical analysis rather than a machine for testing mechanical properties. The fact that torque measurement formed only one aspect of its operation did not alter its essential character. On that basis, the instrument was classifiable under Heading 9027.80 and not Heading 9024.80, and the claimed exemption under Notification No. 158/89 was available because the instrument operated through electrical phenomena varying according to the factor to be ascertained.

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Issues: (i) Whether the Oscillating Disc Rheometer ODR 2000 was correctly classifiable under Heading 9027.80 or under Heading 9024.80. (ii) Whether the instrument was entitled to the benefit of Notification No. 158/89.

Issue (i): Whether the Oscillating Disc Rheometer ODR 2000 was correctly classifiable under Heading 9027.80 or under Heading 9024.80.

Analysis: Heading 90.24 applies to machines and appliances for testing hardness, strength and other mechanical properties of materials, whereas Heading 90.27 covers instruments and apparatus for physical or chemical analysis and for measuring or checking viscosity, porosity, expansion and surface tension. On the material placed before the Tribunal, the ODR 2000 was designed to monitor processing and vulcanisation characteristics of compounded rubber and to produce a rheograph indicating processing, cure characteristics and the physical properties of the final product. The measurement of torque was only one aspect of its operation and did not change the essential character of the instrument.

Conclusion: The instrument was correctly classifiable under Heading 9027.80 and not under Heading 9024.80, in favour of the assessee.

Issue (ii): Whether the instrument was entitled to the benefit of Notification No. 158/89.

Analysis: Since the instrument fell under Heading 9027.80 and its operation depended on electrical phenomena varying according to the factor to be ascertained, it satisfied the requirements for the claimed exemption benefit.

Conclusion: The benefit of Notification No. 158/89 was available to the assessee.

Final Conclusion: The appellate order was set aside and the classification was accepted under Heading 9027.80 with consequential exemption benefit.

Ratio Decidendi: Where the principal function of an instrument is physical or chemical analysis, including measurement of viscosity and curing characteristics, it is classifiable under the heading for such analysis rather than under the heading for testing mechanical properties.

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