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HSChapter 28
U.S. imports of anhydrous disodium tetraborate (refined borax) (HS 284011) totaled $130K in June 2026, traded with 2 countries.
Importers of Anhydrous Disodium Tetraborate (Refined Borax) paid $11K in duties in June 2026 — an effective duty rate of 8.6% on $130K in dutiable value, based on actual customs collections rather than the published tariff schedule. Anhydrous Disodium Tetraborate (Refined Borax) imports of $130K in June 2026 ran 24% below the year-to-date monthly average of $172K.
Last updated: June 2026 dataAnhydrous disodium tetraborate — refined borax in its water-free form — is a critical flux and glass-forming agent used in borosilicate glass, fiberglass insulation, ceramic glazes, and metallurgical applications where the hydrated form would introduce unwanted moisture. Turkey dominates global refined borax production and leads US import supply by a wide margin, a reflection of the country's vast borate mineral reserves; India and Mexico are secondary sources. Classified under the single line 2840110000, it is distinguished from hydrated borax (heading 284019) strictly by the absence of water of crystallization.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The distinction is the presence or absence of water of crystallization. Anhydrous disodium tetraborate (Na₂B₄O₇) contains no bound water and classifies under 2840110000. The common decahydrate form (Na₂B₄O₇·10H₂O), known as borax decahydrate, and the pentahydrate form classify under heading 284019. The product's certificate of analysis or X-ray diffraction data confirming the anhydrous crystal structure is the key supporting document for the 284011 classification.
Turkey holds the world's largest economically recoverable borate reserves and processes a substantial share of global refined borax output, making it structurally dominant in this market. This concentration means that Turkish export policy changes, logistics disruptions, or currency-driven pricing shifts can have outsized effects on US availability and cost. Buyers reliant on anhydrous borax for continuous glass or ceramics production often maintain strategic inventory buffers or dual-source from secondary suppliers such as India or Mexico to manage this single-country exposure.
Monthly import values over time
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2840110000 | ANHYDROUS DISODIUM TETRABORATE (REFINED BORAX) | $130K | 8.58% | 100.00% | $11K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2840110000 | ANHYDROUS DISODIUM TETRABORATE (REFINED BORAX) | $3.5M |
URANIUM ENRICHED IN U235 ETC. PLUTONIUM ETC.
HS 284420
ANHYDROUS AMMONIA
HS 281410
NATURAL URANIUM & COMPOUNDS, ALLOYS & CERAMICS ETC
HS 284410
TUNGSTATES (WOLFRAMATES)
HS 284180
ALLOYS, DISPERSIONS,ISOTOPES & COMPOUNDS NES
HS 284443
ALUMINUM OXIDE, EXCEPT ARTIFICIAL CORUNDUM, NESOI
HS 281820
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| State | Imports | Exports | Balance |
|---|---|---|---|
| California | -- | $3.1M | +$3.1M |
| Washington | $22K | $146K | +$124K |
| Delaware | $109K | $59K | -$50K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LOS ANGELES, CA | -- | $2.3M | +$2.3M |
| LONG BEACH, CA | -- | $440K | +$440K |
| EL PASO, TX | -- | $396K | +$396K |