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HSChapter 25
U.S. imports of kieserite and epsom salts (natural magnesium sulfate) (HS 253020) totaled $172K in April 2026, traded with 4 countries.
Last updated: April 2026 dataNatural magnesium sulfate encompasses two commercially distinct forms: kieserite (monohydrate, MgSO₄·H₂O), used primarily as a slow-release agricultural fertilizer and animal feed supplement, and Epsom salts (heptahydrate, MgSO₄·7H₂O), widely used in personal care, bath products, and horticulture. The US schedule separates these into dedicated 10-digit lines — kieserite (2530201000) and Epsom salts (2530202000) — making the hydration state a classification-critical specification. India leads US imports under this heading, with Germany and China also significant sources.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The US schedule distinguishes kieserite (2530201000), which is the monohydrate form (MgSO₄·H₂O), from Epsom salts (2530202000), which is the heptahydrate (MgSO₄·7H₂O). Importers must confirm the specific hydrate form with the supplier — typically via a certificate of analysis — because misidentifying the hydration state leads to classification under the wrong line. Synthetic magnesium sulfate produced by chemical reaction rather than mined from natural deposits may not qualify under either line and could fall under Chapter 28.
HTS heading 2530 covers minerals of natural origin extracted from geological deposits. Magnesium sulfate produced synthetically — for example, by reacting magnesium oxide with sulfuric acid — is classified in Chapter 28 as an inorganic chemical rather than here. Importers should obtain documentation from the supplier confirming the product is mined or naturally occurring, not chemically manufactured, to support classification under 253020.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2530202000 | EPSOM SALTS | $103K | 18.47% | $2K |
| 2530201000 | KIESERITE | $69K | -- | -- |
EPSOM SALTS
KIESERITE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2530200000 | KIESERITE, EPSOM SALTS (NATURAL MAGNESIUM SULFATE) | $166K |
KIESERITE, EPSOM SALTS (NATURAL MAGNESIUM SULFATE)
9.7K kg
PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT
HS 252329
SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL
HS 250300
SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR
HS 250100
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
PEBBLES, GRAVEL ETC. FOR CONCRETE AGGREGATES ETC.
HS 251710
| State | Imports | Exports | Balance |
|---|---|---|---|
| Pennsylvania | -- | $151K | +$151K |
| Illinois | $139K | -- | -$139K |
| Virginia | $21K | -- | -$21K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| YSLETA, TX | -- | $151K | +$151K |
| LOS ANGELES, CA | $102K | -- | -$102K |
| HOUSTON, TX | $35K | $5K | -$30K |