Volcanic Crater Crude Sulfur
Impure sulfur crystals harvested from active volcanic craters like those in Indonesia or Japan, in raw lump form. HTS 2503.00.0010 covers this natural, unrefined sulfur per hierarchy excluding processed types.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If sublimed for purity
Sublimed volcanic sulfur is excluded from 2503 by Chapter 25 note (a).
If pebblestones or similar sintered volcanic forms
Chapter note prioritizes 2517 for certain volcanic products over other Chapter 25 headings.
If mixed with micaceous iron oxides
Natural micaceous iron oxides with sulfur classify under 2530 per Chapter note.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide export permits from volcanic regions, as some countries regulate native mineral extraction
• Test for arsenic/impurity levels, common in volcanic sulfur, to meet EPA import standards
Related Products under HTS 2503.00.00.10
Native Crude Sulfur Ore
Raw sulfur extracted directly from volcanic deposits or caprock formations, containing impurities like soil and rock. Classified under HTS 2503.00.0010 as crude or unrefined sulfur, excluding sublimed, precipitated, or colloidal forms per Chapter 25 notes.
Frasch Process Crude Sulfur
Yellowish sulfur blocks mined via the Frasch hot-water process from underground Gulf Coast domes, unrefined with minor impurities. Falls under HTS 2503.00.0010 for crude sulfur of all kinds, not further processed.
Unrefined Recovered Sulfur Slabs
Crude sulfur slabs recovered as byproduct from natural gas purification, minimally processed. Classified in HTS 2503.00.0010 as unrefined sulfur, distinct from precipitated forms.
Raw Mined Sulfur Lumps
Large irregular lumps of crude sulfur from open-pit mining operations, uncrushed and unrefined. HTS 2503.00.0010 applies to all crude sulfur excluding refined variants.