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SITCSection 5
U.S. imports of sodium sulfates (SITC 52345) totaled $1.7M in April 2026, traded with 14 countries.
Importers of Sodium Sulfates paid $105K in duties in April 2026 — an effective duty rate of 12% on $889K in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataAnhydrous sodium sulfate (salt cake) and the decahydrate form (Glauber's salt) are the two principal commercial grades, with anhydrous material dominating detergent manufacturing as a filler and processing aid, and Glauber's salt used in glass production and textile dyeing. Mirabilite — naturally occurring sodium sulfate decahydrate — is also traded under this heading when processed to commercial specification. Supply is geographically concentrated, with natural-source producers in arid regions and synthetic producers recovering sodium sulfate as a byproduct of rayon, silica, and dichromate manufacturing. Importers should distinguish between natural and synthetic grades on commercial documentation, as end-use specifications and pricing differ significantly.
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Anhydrous sodium sulfate (Na₂SO₄) contains no water of crystallization and is the preferred form for detergent and glass applications due to its higher active content and easier handling. Glauber's salt is the decahydrate (Na₂SO₄·10H₂O), which is bulkier and less stable at higher temperatures. Both fall within the sodium sulfates heading, but the grade and form should be specified on the invoice to support correct classification and to meet buyer specifications.
Yes — a significant share of global sodium sulfate supply is recovered as a byproduct from rayon (viscose) fiber production, kraft pulp mills, and certain chemical manufacturing processes. Byproduct material is often priced below natural-source or purpose-made product, which can create competitive pressure on domestic producers and may be a factor in antidumping investigations. Importers should monitor trade-remedy developments when sourcing from major producing countries.
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Monthly import values over time