Recovered Frasch Process Sulfur
Yellow solid sulfur blocks recovered via the Frasch hot-water mining method from underground Gulf Coast salt domes. Falls under HTS 2503.00.00.90 as crude sulfur not further refined, distinct from precipitated forms.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If chemically precipitated from sour gas
Precipitated sulfur explicitly excluded by chapter note (a) and classified in 2802.
If in salt form with sodium chloride impurities
High salt content mixtures may classify as natural sodium salts under heading 2501.
If chemically processed into preparations
Advanced chemical preparations containing sulfur shift to Chapter 38.
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
• Include process extraction certificates proving non-precipitated origin to prevent reclassification
• Declare block dimensions and weight; molten sulfur shipments risk categorization as refined
• Check for contamination thresholds that could trigger heading 2530 earth color mixtures
Related Products under HTS 2503.00.00.90
Crude Native Sulfur Ore
Raw sulfur extracted from natural volcanic deposits or caprock formations, containing impurities like dirt and moisture. Classified under HTS 2503.00.00.90 as unrefined sulfur of natural origin, excluding sublimed, precipitated, or colloidal forms per Chapter 25 exclusions.
Volcanic Sulfur Crystals
Bright yellow crystalline sulfur formed around fumaroles in active volcanoes like those in Indonesia or Japan. HTS 2503.00.00.90 covers this natural sulfur variety excluding sublimed or colloidal processing.
Bulk Lump Sulfur from Mines
Irregular lumps of native sulfur mined from surface outcrops, typically 99% pure with rock inclusions. Classified in HTS 2503.00.00.90 as other crude sulfur not meeting sublimed or precipitated definitions.
Natural Sulfur Pebbles
Small, rounded natural sulfur pebbles collected from sedimentary deposits, suitable for industrial grinding. HTS 2503.00.00.90 includes these unprocessed forms excluding chapter exclusions.
Caprock Native Sulfur
Native sulfur from limestone caprock formations above salt domes, mined via conventional methods. Under HTS 2503.00.00.90 as other non-sublimed, non-precipitated sulfur.
Polish Native Sulfur Lumps
Native sulfur lumps from Polish Carpathian deposits, valued for low impurity profile in fertilizer production. HTS 2503.00.00.90 covers this European crude sulfur source.