What is HS 280700?
HS 280700 covers sulfuric acid in all concentrations, including oleum (fuming sulfuric acid), historically known as oil of vitriol. It is classified under Chapter 28 of the Harmonized System, which covers inorganic chemicals. The code applies to both virgin acid produced from elemental sulfur via the contact process and by-product acid recovered from smelter off-gases — a distinction that has significant cost implications for sourcing.
End-use applications span multiple heavy industries: phosphoric acid production for fertilizers (the dominant demand driver), hydrometallurgical leaching in mining and metallurgy, petroleum refining, general chemical manufacturing, and increasingly, battery manufacturing where acid is used in lead-acid cell production. Because demand tracks agricultural planting cycles and base metals output simultaneously, procurement teams in fertilizer and mining supply chains are often competing for the same supply.
Top Sourcing Countries for Sulfuric Acid / Oil of Vitriol
Global export supply for HS 280700 is moderately concentrated, with eight origins accounting for the majority of recorded trade flows.
- China (15.5% share, 61 markets): The largest single exporter by volume, with reach across Asia, Latin America, and Africa. Chinese export volumes are a primary price signal — when domestic consumption softens or smelter by-product output rises, export surges tend to compress global benchmark pricing. Chile recorded $167.6M in imports from China in 2024, illustrating China's penetration even into resource-rich markets.
- Canada (9.6% share, 24 markets): The dominant supplier to the US market, with $217.3M in recorded trade flows in 2024 — the single largest bilateral corridor globally. Canadian supply is largely by-product acid from non-ferrous smelting, making it structurally cost-competitive versus virgin acid producers.
- Japan (8.4%) and South Korea (7.4%): Both serve regional Asian markets and select Pacific Rim buyers. Like Canada, their supply base is heavily tied to copper and zinc smelting by-product recovery, providing a degree of price insulation from elemental sulfur spot movements.
- Mexico (6.0%, 10 markets): A cost-competitive near-shore supplier to the US, with $77.6M in bilateral flows in 2024. Proximity advantages make Mexican origin materially lower in delivered freight cost for US Gulf and Southwest buyers versus transoceanic alternatives.
- Peru (5.7%, 3 markets): A highly concentrated exporter, supplying primarily Chile ($126.4M in 2024). Peruvian supply is driven by copper smelter off-gas recovery, linking availability directly to Andean mining output cycles.
- Germany (5.4%, 105 markets): The most geographically diversified exporter, reaching 105 import markets. German origin carries premium positioning for high-purity applications and serves as a key intra-European supplier. EU MFN duty of 3.0% applies uniformly across member states for third-country imports, giving intra-EU flows a structural tariff advantage.
- Bulgaria (5.2%, 27 markets): A significant regional supplier with $71.1M in exports to Turkey in 2024, reflecting established industrial corridors in Southeast Europe and the Black Sea region.
Import Duty Rates and Trade Agreements
The EU MFN rate for HS 280700 is 3.0% across all member states — a uniform rate that applies to imports from non-preferential origins including China, the US, and most non-EU suppliers. For high-volume buyers, this tariff differential is meaningful at scale and creates a cost incentive to source from within the EU single market or from countries with active EU free trade agreements.
In the Americas, USMCA preferential rules provide duty-free access for qualifying Canadian and Mexican origin acid entering the US, reinforcing the dominance of those two corridors. Procurement teams sourcing for US-based facilities should verify certificate of origin documentation to capture USMCA preference, particularly given the volume significance of the Canada-US and Mexico-US corridors. Buyers in emerging markets such as Morocco ($91.6M from China in 2024) and Kazakhstan ($80.9M from Russia in 2024) should assess applicable bilateral agreements and any sanctions-related compliance obligations before formalizing supplier arrangements.
Cost Drivers and Price Outlook
Sulfuric acid pricing is driven by a layered set of feedstock and market signals. Elemental sulfur spot prices form the cost floor for virgin acid production, while copper smelter by-product supply — which carries near-zero feedstock cost — acts as a volume ceiling on market pricing when smelter utilization is high. With copper trading at approximately $13,484/MT as of May 2026, up 4.6% month-on-month, elevated copper output is supporting by-product acid availability from major smelting nations including Canada, Peru, Japan, and South Korea.
Energy costs are a meaningful variable: the contact process is energy-intensive, and with Brent crude at approximately $69.4/bbl, energy-sensitive producers face moderate input cost pressure. Phosphate fertilizer demand cycles — tied to northern hemisphere planting seasons — create predictable Q1 and Q3 demand spikes that procurement teams should anticipate when timing forward purchases. Chinese export volume decisions remain the single most volatile external factor, capable of shifting global spot pricing materially within a single quarter.
Compliance and Sourcing Considerations
Sulfuric acid is classified as a hazardous material (corrosive, UN 1830) under international transport regulations, restricting viable logistics to bulk liquid tankers, ISO tank containers, and certified road tankers. This limits the number of qualified carriers and terminals, concentrating trade flows along established industrial corridors. Buyers sourcing from non-traditional origins should verify tank container availability and terminal compatibility before contracting.
Dual-use controls apply to HS 280700 in multiple jurisdictions due to the chemical's precursor role in explosives manufacturing and illicit drug synthesis. Export licensing requirements are enforced in the EU, US, and other OECD members, with heightened scrutiny for shipments destined for sanctioned or high-risk jurisdictions. Importers should obtain end-use certificates from suppliers and confirm that export licenses have been secured at origin. Transshipment risk for this commodity is rated medium — customs authorities in key markets actively monitor re-routing patterns, and documentation chains should clearly evidence origin and chain of custody.
How to Source Sulfuric Acid / Oil of Vitriol Efficiently
For procurement managers and freight forwarders working with HS 280700, the following steps reduce sourcing risk and total landed cost:
- Validate supplier feedstock type: By-product acid from copper or zinc smelters is typically priced at a discount to virgin acid. Confirm production process at origin to benchmark pricing accurately.
- Assess logistics infrastructure first: Confirm ISO tank availability, port terminal approvals for corrosive liquids, and road tanker certifications before negotiating supply terms. Logistics constraints are frequently the binding constraint, not price.
- Time procurement to demand cycles: Fertilizer sector demand spikes in Q1 and Q3; sourcing ahead of these windows typically yields better availability and more competitive indicative pricing from suppliers.
- Monitor Chinese export signals: Track Chinese smelter utilization rates and domestic demand indicators as a leading signal for global spot price direction.
- Verify compliance documentation at origin: Obtain SDS, transport emergency cards (TREM), export licenses, and end-use certificates before shipment. Non-compliant documentation at destination customs can result in holds, fines, or return shipments on a hazmat cargo — costly at any volume.
- Leverage FTA preferences: US buyers should capture USMCA preference on Canadian and Mexican origin. EU buyers sourcing from FTA partner countries should verify preferential tariff eligibility to reduce the 3.0% MFN burden.
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