Native Lump Sulfur
Large irregular lumps of elemental sulfur mined from caprock deposits, unrefined and suitable for crushing. Classified in 2503.00.00 as natural sulfur not subjected to sublimation, precipitation, or colloidal processing.
Import Duty Rates by Country of Origin
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If refined by sublimation
Sublimed sulfur is specifically excluded by chapter notes and moves to heading 2802.
If containing significant metal sulfides
Roasted sulfur ores with metal content fall under Chapter 26 as metal ores, not pure sulfur.
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Import Tips & Compliance
• Include mining certificates proving natural extraction to prevent confusion with manufactured sulfur
• Watch for moisture content affecting weight declarations during customs valuation
Related Products under HTS 2503.00.00
Crude Natural Sulfur Ore
Raw sulfur extracted from volcanic deposits or natural underground formations, containing impurities like soil and moisture. It falls under HTS 2503.00.00 as crude sulfur of natural origin, excluding processed forms like sublimed, precipitated, or colloidal sulfur as specified in chapter notes.
Frasch Process Sulfur
Molten sulfur extracted via the Frasch hot-water mining method from underground deposits, solidified into blocks. It qualifies under 2503.00.00 as natural sulfur, distinct from chemically precipitated or sublimed varieties.
Recovered Sulfur from Sour Gas
Elemental sulfur recovered as a byproduct from natural gas desulfurization plants via Claus process, in flake or prill form. Falls under 2503.00.00 as it remains unprocessed natural sulfur, not sublimed or colloidal.
Volcanic Sulfur Crystals
Bright yellow crystalline sulfur formed around volcanic fumaroles, hand-collected with minimal processing. Classified in HTS 2503.00.00 as crude natural sulfur excluding the prohibited sublimed, precipitated, and colloidal forms.
Bulk Crushed Sulfur Rock
Crushed rock containing native sulfur from mining operations, used directly in sulfuric acid production. Meets 2503.00.00 criteria as unrefined sulfur not in excluded chemical forms.
Natural Sulfur Prills
Small spherical prills of native sulfur formed during natural cooling from molten extraction, minimally processed. Properly classified under 2503.00.00, distinct from artificially precipitated sulfur.