Supreme Court Rules n-Hexane Is a Pure Chemical Compound, Not Motor Spirit Under Chapter 27

A Division Bench upheld CESTAT's classification of n-Hexane under Chapter 29 as a separate chemical compound, rejecting Revenue's claim that flash point alone determines tariff heading.

The Supreme Court has dismissed a civil appeal filed by the Commissioner of Customs, Kandla, holding that imported n-Hexane — sold commercially as “Exxsol Hexane RD” or “Hydrosol n-Hexane” — is correctly classified under Customs Tariff Heading 2901.10 and Central Excise Tariff Heading 2901.90 as a saturated acyclic hydrocarbon, and not under CTH 2710.00 and CETH 2710.12 as a petroleum oil or Motor Spirit. A Division Bench of Justice Aravind Kumar and Justice Prasanna B. Varale, deciding Civil Appeal No. 569 of 2012, affirmed the order of CESTAT, Ahmedabad dated 15 July 2011. The Court found that Revenue had discharged neither the burden of proving the product was a Motor Spirit nor the requirement that it be used as fuel in spark ignition engines. The DGFT's Policy Circular dated 14 July 2004 — which categorically placed Hexane under Chapter 29 — was treated as binding on the authorities.

How the Dispute Reached the Supreme Court

M/S Reliance Industries Limited filed a Bill of Entry self-classifying the imported n-Hexane under CTH 2901.10 and CETH 2901.90, describing it as a saturated acyclic hydrocarbon in commercially pure form. The goods were provisionally assessed pending a chemical test. The SGS Redwood Test Analysis Report dated 10 May 2000 recorded that the product had a distillation range of 67.2°C and a flash point below 25°C.

On the basis of that report, Revenue issued a Show Cause Notice dated 21 March 2001, proposing classification under Chapter 27 on the ground that the product was an admixture of various hydrocarbons and, having a flash point below 25°C, constituted a Motor Spirit suitable for spark ignition engines.

The Assistant Commissioner of Customs passed Order-in-Original No. KDL/AC/SB/03/2003 dated 1/25 September 2003, accepting Revenue's position and classifying n-Hexane under CTH 2710.00 and CETH 2710.12. The Commissioner (Appeals) reversed that order, holding that the HSN Explanatory Notes specifically named Hexane under heading 29.01 and that the SGS report was consistent with the chemical characteristics of commercially pure Hexane. Revenue then appealed to CESTAT, Ahmedabad, which dismissed the appeal by Order No. A/1280/WZB/AHD/2011 in Appeal No. C/588/04. Revenue's further appeal brought the matter before the Supreme Court.

What Revenue and the Assessee Each Argued

Mr. S. Dwarkanath, the learned Additional Solicitor General for Revenue, contended that the SGS Chemical Test Report described the imported good as a “mixture of saturated hydrocarbons in the form of clear colourless liquid flashing below 25°C.” He argued that once the Customs Tariff Act was explicit on classification, HSN Notes need not be consulted. He relied on Chapter Note 1(b) to Chapter 29 of the HSN Explanatory Notes, which excludes mixtures of acyclic hydrocarbon isomers from Chapter 29 and places them under Chapter 27. The distillation range of 63°C to 70°C and the sub-25°C flash point, he submitted, confirmed the product was an admixture and not a pure compound.

Mr. Shyam Divan, Senior Counsel for Reliance Industries, countered that n-Hexane is an acyclic straight-chain hydrocarbon with the chemical formula C6H14 and is specifically listed under Chapter 29 of the HSN Notes. He argued that for a product to be classified as a Motor Spirit under CTH 2710.00 and CETH 2710.12, three cumulative conditions must be satisfied: the product must be a hydrocarbon oil, its flash point must be below 25°C, and it must be shown to be suitable for use as fuel in spark ignition engines. Revenue had only established the second condition. He further submitted that the impurities present in the imported product — other isomers of hexane, sulfur, chlorine and similar substances — arose solely from the fractional distillation manufacturing process and were not deliberately added, placing them within the permissible impurities recognised by Chapter Note 1(a) of Chapter 29. He also relied on the DGFT Policy Circular No. 40(RE-2003)/2002-2007 dated 14 July 2004, which clarified that Hexane falls under Chapter 29.

The Court's Reasoning on Chemical Composition and Tariff Structure

The Court began by setting out the basic chemistry. n-Hexane is a saturated acyclic hydrocarbon with the molecular formula C6H14, existing in a linear chain structure. It has a distillation range of 63°C to 70°C and a flash point below 25°C — properties that the SGS report and the Kirk-Othmer Encyclopedia of Chemical Technology both recorded in near-identical terms. The Court noted that pure hexane, derived through fractional distillation of crude petroleum, cannot be entirely freed of impurities such as benzene, sulfur, oxygen and chlorine, and that the Kirk-Othmer Encyclopedia recorded a purity of 63.91% for Hexane A, while the SGS report recorded 63.93% — figures the Court found congruent and undisputed.

The Court then examined the tariff structure. Chapter 27 of the HSN Explanatory Notes, the Customs Tariff Act and the Central Excise Tariff Act are all directed at mineral fuels, petroleum oils and their distillation products. Each version of Chapter 27 expressly excludes “separately chemically defined organic compounds” from its scope. Chapter 29, by contrast, applies to separate chemically defined organic compounds, whether or not containing impurities, and specifically lists Hexane under Sub-Heading 2901.10 as a saturated acyclic hydrocarbon with six carbon atoms. The Court found that the three versions of Chapters 27 and 29 — HSN, Customs Tariff and Central Excise Tariff — were pari materia, leaving little room for doubt.

On the role of HSN Notes, the Court reaffirmed the position in CCE v. Wood Craft Products Limited (1995) 3 SCC 454 that HSN Notes are a safe guide for resolving tariff classification disputes, and that where the expression used in the Notes is in the same context as the Tariff Acts, the meaning may be imported directly. The Court rejected Revenue's argument that HSN Notes are relevant only when the Tariff Act is ambiguous, holding that the Notes serve as an interpretative guide in all classification disputes.

Applying General Rule 3(a) of the HSN General Rules of Interpretation, the Court held that where goods are classifiable under two headings, the heading providing the most specific description prevails. Chapter 29's specific listing of Hexane under Sub-Heading 2901.10 was more specific than Chapter 27's general coverage of petroleum oils and their fractions.

Why Revenue Failed on the Motor Spirit Condition

The Court identified three cumulative conditions that must be satisfied for a product to be classified as a Motor Spirit under CETH 2710.12: it must be a hydrocarbon oil, its flash point must be below 25°C, and it must be shown to be suitable for use as fuel in spark ignition engines, either by itself or in admixture with any other substance. The Court drew on its earlier decision in CCE v. GAIL (India), 2022 SCC OnLine SC 2130, which had articulated the same three-part test and held that all three ingredients must be satisfied.

Revenue had placed only the SGS Chemical Test Report on record, which established the flash point and distillation range. No oral or documentary evidence was led to show that the imported n-Hexane was used as fuel in spark ignition engines. The Court found that the Respondent-Assessee's uncontested position — that n-Hexane is used as a solvent for extraction of vegetable oils, in manufacture of HDPE, as a paint diluent, and in polymerisation reaction media — remained unrebutted. Revenue's case, the Court held, was “sans cogent evidence” on the Motor Spirit condition.

The Court also addressed the impurities argument. Chapter Note 1(a) of Chapter 29 permits impurities that arise solely from the manufacturing process, including unconverted starting materials, impurities present in starting materials, reagents used in the process, and by-products. The Court found that the other compounds present in the imported product — 2,3-Dimethylbutane (0.05%), 2-Methyl Pentane (3.48%), 3-Methyl Pentane (9.38%), Methyl cyclopentane (19.3%), Cyclohexane (0.78%), Benzene (2.81%) and Dimethyl pentane (0.16%) — were unconverted starting materials from the fractional distillation process. None had been deliberately added or deliberately left in the product to render it suitable for a specific use. Their presence therefore fell within permissible impurities and did not convert n-Hexane into a mixture of isomers excluded from Chapter 29.

The DGFT Circular as a Binding Classification

The Court placed separate and independent weight on Policy Circular No. 40(RE-2003)/2002-2007 dated 14 July 2004 issued by the Directorate General of Foreign Trade. The DGFT had clarified, in response to doubts raised about the classification of Hexane, that its import falls under Chapter 29 of the ITC (HS) Classifications of Export and Import Items, 2002-07. Relying on its earlier decision in Atul Commodities Private Limited v. Commissioner of Customs (2009) 5 SCC 46, the Court held that under Para 2.3 of the Foreign Trade Policy, the DGFT's decision on classification is final and binding on the authorities. The Court observed that the appeal could have been dismissed on the strength of this circular alone.

The Court also noted the revenue implications of misclassification. The duty payable under Chapter 27 is higher than that under Chapter 29. The Court observed that a wrong classification carries consequences — enhanced or reduced duty, penalties, and misapplication of circulars — and that no person or authority should be burdened in a manner that defeats the objective of the provisions.

Order

The Court dismissed Civil Appeal No. 569 of 2012 filed by the Commissioner of Customs, Kandla. The order of CESTAT, Ahmedabad dated 15 July 2011 was affirmed. The Court concluded on five grounds: Revenue had not discharged the initial burden of proof; Rule 3(a) of the HSN General Rules of Interpretation required the specific mention of Hexane under Chapter 29 to prevail; n-Hexane satisfied the definition of a separately chemically defined compound under Chapter Note 1 of Chapter 29; the DGFT Policy Circular dated 14 July 2004 categorically placed Hexane under Chapter 29; and Revenue could not be unjustly enriched through a classification that was contrary to the HSN Notes. All pending applications were disposed of. The judgment was delivered on 25 May 2026.