Rhodium catalyst classification turns on chapter notes, HSN scope, technical evidence, and expert chemical analysis.

Classification of a rhodium-based catalyst depended on whether it was a supported catalyst under Chapter Heading 3815.12 or a compound of precious metals under Chapter Heading 2843.90. The text stresses that a product can fall in Chapter 28 only if it is first shown to be a compound covered by the relevant chapter notes, and that Chapter 38 and Chapter 28 must be examined against the HSN explanatory material, test report, and technical composition. In a technically complex dispute, specialist chemical evidence and disclosure of the test report to the assessee are material. The original classification could not be sustained and the matter required fresh consideration.

---

---

Issues: Whether the imported product, described as a rhodium-based catalyst, was classifiable under Chapter Heading 3815.12 as a supported catalyst or under Chapter Heading 2843.90 as a compound of precious metals, and whether the original classification order could stand without proper examination of the chapter notes, HSN scope, test report, and technical evidence.

Analysis: The classification dispute turned on the interaction between Chapter 38, which covers catalysts, and Chapter 28, which covers compounds of precious metals. A product falling within Chapter Heading 2843.90 would be classifiable there notwithstanding its use as a catalyst, but only if it was first shown to be a compound covered by the relevant chapter notes. The record showed that the lower authority had largely relied on an earlier order, without independently analysing the chapter notes, the HSN explanatory material, the test report, or the technical composition of the product. Since the product was a proprietary item intended for catalytic use, its literature and the technical report were material. The Tribunal also noted that, in a technically complex matter, expert opinion from a chemical examiner or other specialist was necessary, and the assessee should have been given the test report to meet the technical case against it.

Conclusion: The classification order was not proper and could not be sustained. The matter was remanded for de novo consideration with directions to examine the technical materials, chapter notes, HSN scope, and expert evidence, and to afford the assessee an opportunity to respond.

---