HS 250830 — Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths
Trade-statistics name: Fire Clay, Whether Or Not Calcined
HS 250830 (HTS line 2508.30.00.00) imported into the United States from China at a declared value of $1,000 carries an estimated duty of $125, which is 12.5% of the declared value: a Column 1 general rate of 0%, plus additional duty of Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52). That composition is what the USITC schedule dated 2026-11-06 and the Chapter 99 measures in force on that schedule produce; it excludes merchandise processing and harbor maintenance fees.
Rates and descriptions: USITC Harmonized
Tariff Schedule export dated 2026-11-06.
Chapter 99 layers are the same composition the tariff API returns
(schedule stamp 2026-11-11). Re-check this
number by calling
GET /api/v1/tariff?hs=2508.30.00.00&origin=CN&value=1000.
250830 is the six-digit subheading of heading 2508 (“Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths”) in chapter 25. 1 HTS statistical line sit under it in the USITC export dated 2026-11-06; US general imports of the code totalled $37.4K in September 2026.
HS 250830 — US general imports
$37.4KAll countries, September 2026.
Source: U.S. Census Bureau, foreign-trade statistics — 2026-09, monthly general imports (GEN_VAL_MO), all countries, this six-digit code's own line, not a roll-up. Census rows collected 2026-11-08T00:03:28Z.
What a China-origin shipment of HS 250830 pays at entry
The Column 1 rate is only the first layer. For goods originating in China, 1 of this code's 1 HTS lines also carry additional duty under Chapter 99 note family, so every priceable line lands on 12.5% of the declared value. The table stacks the two layers line by line; the last column is the duty on a $1,000 declared value, and each HTS line links to the calculator with that line and this origin already filled in.
| HTS line | Column 1 (MFN) | Additional duty (China) | Total ad valorem | Duty on $1,000 |
|---|---|---|---|---|
| 2508.30.00.00 | 0% | +12.5%Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 12.5% | $125 |
Additional duty for origin CN (China) only, priced on a $1,000 declared value from the Chapter 99 composition the tariff API serves (schedule stamp 2026-11-11). A different origin can carry a different set of Chapter 99 measures on the same line — the free calculator prices one line and one origin at a time, and ExportSonar Pro monitors a set of your own codes so a rate change reaches you with its old value, its new value and the USITC source. Rates are informational and not a binding customs ruling.
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Leading suppliers of HS 250830 — September 2026
Where the goods under this code came from, by country of origin, from the Census monthly series (all countries, general imports). Each share is of the subheading 250830’s own total, printed in the table footer:
| Origin country | US imports | Share of total |
|---|---|---|
| CHINA | $15.6K | 41.75% |
| CANADA | $13.3K | 35.49% |
| SPAIN | $8.5K | 22.75% |
| Total, all 3 countries | $37.4K | 100.00% |
Exact total, all 3 origin countries: $37,430 — the figure the shares above divide by.
Percentages are rounded to two decimals, so they may not add to exactly 100%; the dollar amounts sum to the total in the table footer without rounding.
Source: U.S. Census Bureau, foreign-trade statistics — 2026-09, monthly general imports (GEN_VAL_MO). Shares are computed from individual-country rows only: Census publishes continent, APEC/ASEAN/OECD-style bloc and "total for all countries" rows in the same response, and adding those would count the same dollars two to five times over. Census rows collected 2026-11-08T00:03:28Z.
HTS lines under HS 250830
Every statistical line the US schedule places under this six-digit subheading, copied from the USITC export without edits: the Column 1 general (MFN) rate, the special-program symbols and the statutory Column 2 rate.
| HTS line | Description | Unit | General (Col. 1) | Special | Column 2 |
|---|---|---|---|---|---|
| 2508.30.00.00 | Fire-clay | t | Free | — | $1.97/t |
Where this code sits in the schedule
Six digits is the last level the WCO Harmonized System defines internationally: chapter 25, heading 2508, subheading 250830. The US adds national digits below it — eight for the tariff line, ten for the statistical suffix — which is why two traders quoting “the HS code” can still disagree on the rate. Browse the ladder:
Other six-digit codes under heading 2508
Frequently asked questions
What does an entry under HS 250830 cost for a China origin?
Column 1 is only the first layer. On 1 of this code's 1 HTS lines the additional Chapter 99 duty for a China origin is also charged (Chapter 99 note family), so the entry lands at 12.5% of the declared value -- before merchandise processing and harbour maintenance fees. The layer table on this page lists the provision behind each line and the duty on a $1,000 value, and the calculator prices any other origin or value one line at a time.
How much does the US import under 250830?
US general imports under HS 250830 totalled $37.4K in September 2026, across 3 origin countries recorded by the Census Bureau. The largest supplier was CHINA with 41.8% of the value. Six digits is the grain the trade statistics publish, which is why this page stops there and lists the ten-digit lines separately.
Which products are classified under HS 250830?
250830 sits under heading 2508 (Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths). Its own statistical lines are: Fire-clay. Classification follows the HTS text for the goods, not the marketing name, so match the wording before you file.
How do I estimate duty on an entry under 250830?
Duty is the entered value times the rate of the HTS line you declare, plus any Chapter 99 measure that applies to the shipment's origin. Under 250830 the Column 1 general rates run on a specific or compound basis (see the table); run your own value and origin through the free calculator to see the stacked number.
Related pages & tools
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Rates and descriptions: USITC Harmonized Tariff Schedule export dated 2026-11-06 (line set 250830.*). Import value and suppliers: U.S. Census Bureau monthly general imports, September 2026. Rates are informational and not a binding customs ruling.