United States v. Aetna Explosives Co.
Headline: Court upholds free entry for nitric acid mixed only to prevent tank corrosion, ruling small sulfuric additions for safe transport do not create a dutiable chemical mixture for importers.
Holding:
- Importers can add small sulphuric acid for safe transport without triggering mixture duties.
- Customs cannot treat such mechanical mixtures as new, dutiable chemical preparations.
- Clarifies classification rules for transporting concentrated industrial acids.
Summary
Background
Importers brought concentrated nitric acid to the United States after adding about 20% by weight (but only about 0.5% by value) of sulfuric acid to prevent the nitric acid from corroding steel tank cars during shipment. Customs treated the import as a dutiable “mixture” under a tariff provision charging 15% duty, while the importers and the lower Court of Customs Appeals found the shipment fell within a tariff free list of acids and should enter free.
Reasoning
The key question was whether the small amount of sulfuric acid turned the cargo into a new, dutiable commercial mixture. The Supreme Court agreed with the lower court. It held that both acids were covered by the free list, that the sulfuric addition was made only to allow safe shipment and did not produce a usable commercial preparation, and that the two acids did not chemically interact. The Court treated the addition as part of the means of shipment, similar to necessary packing, and found no loss of revenue to justify duty treatment.
Real world impact
The decision lets importers of strong nitric acid avoid mixture duties when they add a small amount of sulfuric acid solely to protect shipping tank cars. It clarifies that an additive used only to enable safe transport, which does not create a merchantable product, will not be treated as a new dutiable preparation under the tariff provision. The judgment affirms the lower court’s result.
Dissents or concurrances
One Justice dissented from the Court’s decision, but the opinion of the majority controls the result.
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