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Official data Source: US Census Bureau international trade data Data through August 2026 · updated monthly

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HS 2836.40

Potassium carbonates

In short

  • The US imported $16.8M of this product over the 12 months to August 2026, down 15% on the year before.
  • Korea, South is the largest supplier, with 63.6% of US imports; Taiwan is next, with 21.8%.
  • Taiwan is the cheapest main supplier before and after freight and duty, landing at $1.11/kg.
  • Duty paid averaged 12.1% of the value of imports in August 2026, down 2.8 points on a year earlier.
  • United Kingdom is gaining share: 9.4% over the last 12 months, up from 3.4%.
  • 2 Federal Register notices named this product's tariff codes in the last 12 months.

US imports, Aug 2026

$888K

↓ −34% vs Aug 2025

Last 12 months

$16.8M

↓ −15% vs the 12 months before

Average duty paid

12.1%

↓ −2.8 pts vs Aug 2025

Top supplier

Korea, South

63.6% of US imports

US imports by month

The last 13 months, so the same month a year ago is on the left. August 2026 is highlighted. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.

Aug2025SepOctNovDecJan2026FebMarAprMayJunJulAugTaiwan ↑Duty ↓
Show the numbers
MonthUS imports
August 2025$1.4M
September 2025$1.7M
October 2025$909K
November 2025$1.3M
December 2025$1.2M
January 2026$1.3M
February 2026$1.7M
March 2026$1.8M
April 2026$1.7M
May 2026$1.6M
June 2026$1.3M
July 2026$1.3M
August 2026$888K

What changed

  • US imports were $888K in August 2026, down 31% from July 2026 and down 34% from August 2025.
  • Over the 12 months to August 2026 they totalled $16.8M, down 15% on the 12 months before.
  • Biggest moves in market share since July 2026: Korea, South up from 35.1% to 63.6%, Germany down from 14.6% to 0.3%.
  • Average price from Korea, South fell 27% since July 2026, to $0.94/kg.
  • Duty paid on imports from China rose from 32.2% to 38.8% of their value since July 2026.

US trade by year

US imports were $16.8M in the 12 months to Aug 2026, down 47% on the 12 months to Aug 2017. US exports were $38.8M, up 183%. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.

2017201820192020202120222023202420252026Duty ↑
Show the numbers
PeriodUS imports
12 months to Aug 2017$31.4M
12 months to Aug 2018$26.8M
12 months to Aug 2019$21.1M
12 months to Aug 2020$21.6M
12 months to Aug 2021$15.8M
12 months to Aug 2022$18.1M
12 months to Aug 2023$17.9M
12 months to Aug 2024$16.8M
12 months to Aug 2025$19.8M
12 months to Aug 2026$16.8M
  • Korea, South
  • Taiwan
  • United Kingdom
  • Germany
  • All countries
Share of US imports
Show the numbers
PeriodKorea, SouthTaiwanUnited KingdomGermany
12 months to Aug 201727.6%5.4%1.9%6.3%
12 months to Aug 201830.3%8.4%2.1%10.4%
12 months to Aug 201953.8%11.3%2.7%21.6%
12 months to Aug 202057.3%11.5%2.6%18.5%
12 months to Aug 202141.3%16.2%2.8%25.8%
12 months to Aug 202253.6%13.2%1.9%19.2%
12 months to Aug 202360.9%17.7%2.5%8.0%
12 months to Aug 202455.0%19.1%3.2%9.6%
12 months to Aug 202560.4%15.7%3.4%8.9%
12 months to Aug 202656.7%14.5%9.4%5.1%
Duty paid, % of value
Show the numbers
PeriodKorea, SouthTaiwanUnited KingdomGermanyAll countries
12 months to Aug 20170.0%1.9%1.3%1.7%1.0%
12 months to Aug 20180.0%1.9%1.3%1.6%1.1%
12 months to Aug 20190.0%1.9%1.3%1.7%1.1%
12 months to Aug 20200.0%1.9%1.3%1.6%1.8%
12 months to Aug 20210.0%1.9%1.3%1.6%1.9%
12 months to Aug 20220.0%1.9%1.3%1.6%1.8%
12 months to Aug 20230.0%1.9%1.3%1.6%1.7%
12 months to Aug 20240.0%1.9%1.3%1.6%2.3%
12 months to Aug 20254.8%5.2%4.2%4.8%6.8%
12 months to Aug 202612.8%14.7%11.3%11.6%14.0%
PeriodUS importsDuty paidUS exports
12 months to Aug 2026$16.8M−15%14.0%+7.1 pts$38.8M+14%
12 months to Aug 2025$19.8M+18%6.8%+4.5 pts$34.1M+78%
12 months to Aug 2024$16.8M−5.9%2.3%+0.6 pts$19.1M−33%
12 months to Aug 2023$17.9M−1.1%1.7%−0.1 pts$28.7M+4.6%
12 months to Aug 2022$18.1M+14%1.8%−0.1 pts$27.4M+72%
12 months to Aug 2021$15.8M−27%1.9%+0.1 pts$16.0M+5.6%
12 months to Aug 2020$21.6M+2.7%1.8%+0.7 pts$15.1M−12%
12 months to Aug 2019$21.1M−21%1.1%+0.1 pts$17.2M−10%
12 months to Aug 2018$26.8M−15%1.1%0.0 pts$19.1M+39%
12 months to Aug 2017$31.4M1.0%$13.7M

Who supplies the US

August 2026. Small figures under each value are the change from August 2025. Landed cost by origin, below, adds freight and duty to the price.

CountryUS importsShareAverage priceDuty paidLast 13 months
Korea, South$565K63.6%+2.7 pts$0.94/kg−17%12.5%+0.9 pts
Taiwan$194K21.8%+7.6 pts$0.88/kg−6.5%10.0%−1.9 pts
United Kingdom$53K6.0%+2.1 pts$2.78/kg−8.2%11.3%0.0 pts
China$24K2.6%−2.6 pts$1.05/kg−11%38.8%−17.5 pts
Israel$22K2.5%new$9.80/kg0.0%
Czech Republic$17K1.9%+0.3 pts$5.08/kg+7.2%10.0%−1.3 pts
India$7K0.8%+0.5 pts$1.38/kg−58%1.3%−10.6 pts
Hong Kong$5K0.5%−0.2 pts$1.93/kg−43%13.8%−18.0 pts
Germany$3K0.3%0.0 pts$168.33/kg+2866%10.0%−9.0 pts
All countries$888K100.0%$1.02/kg−9.8%12.1%−2.8 pts

The 3 largest suppliers had 80.7% of US imports over the last 12 months.

Landed cost by origin

What importers paid to land this product at a US port from each main supplier, June–August 2026: the price, freight and insurance to the first US port, and duty, per unit. Suppliers with 3% or more of these imports, cheapest landed first. Small figures under landed cost are the change from the same months a year earlier.

  • Price
  • Freight and insurance
  • Duty
CountryPriceFreight and insuranceDutyLanded costMake-up
Taiwan$0.88/kg$0.15/kg16.6% of price$0.09/kg10.1% of price$1.11/kg−3.5%
Korea, South$1.03/kg$0.28/kg27.4% of price$0.12/kg11.3% of price$1.43/kg−2.9%
China$1.39/kg$0.05/kg3.5% of price$0.48/kg34.3% of price$1.92/kg−6.5%
Germany$2.50/kg$0.11/kg4.4% of price$0.24/kg9.8% of price$2.86/kg+10.0%
United Kingdom$2.85/kg$0.48/kg16.7% of price$0.32/kg11.3% of price$3.65/kg+2.8%
All countries$1.18/kg$0.24/kg20.0% of price$0.14/kg11.9% of price$1.56/kg+3.8%

Landed at a US port, Taiwan was cheapest, at $1.11/kg: 22.2% below Korea, South.

How the market is shifting

United Kingdom gained the most share: 9.4% of US imports over the last 12 months, up from 3.4% in the 12 months before. Germany lost the most: 5.1%, down from 8.9%. The charts show September 2024 to August 2026 for the 4 largest suppliers over the last 12 months. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.

  • Korea, South
  • Taiwan
  • United Kingdom
  • Germany
  • All countries
Share of US imports
Show the numbers
MonthKorea, SouthTaiwanUnited KingdomGermany
September 202469.3%18.8%0.0%3.2%
October 202461.8%12.6%2.8%12.0%
November 202475.3%10.7%0.0%10.3%
December 202463.7%16.0%6.0%2.0%
January 202543.0%17.7%13.8%19.4%
February 202551.3%14.7%4.1%17.5%
March 202554.0%19.6%2.5%10.8%
April 202544.3%21.6%5.6%12.3%
May 202576.2%10.5%1.0%6.0%
June 202551.4%20.2%4.3%8.7%
July 202549.7%18.5%2.7%9.3%
August 202561.0%14.2%3.8%0.3%
September 202552.7%10.7%15.9%7.3%
October 202561.6%9.4%4.7%8.1%
November 202565.6%10.1%15.5%0.0%
December 202545.2%12.3%16.9%5.5%
January 202665.1%7.8%11.0%2.9%
February 202661.6%18.9%5.6%3.3%
March 202645.6%23.2%14.2%4.8%
April 202667.1%11.3%6.3%1.9%
May 202658.7%19.9%0.0%5.0%
June 202662.1%4.0%6.5%8.3%
July 202635.1%21.9%8.0%14.6%
August 202663.6%21.8%6.0%0.3%
Duty paid, % of value
Show the numbers
MonthKorea, SouthTaiwanUnited KingdomGermanyAll countries
September 20240.0%1.9%n/a1.9%1.3%
October 20240.0%1.9%1.3%1.7%2.1%
November 20240.0%1.9%n/a1.4%0.6%
December 20240.6%1.9%1.3%1.3%2.5%
January 20250.0%1.9%1.9%1.9%2.0%
February 20250.0%1.9%1.3%1.6%2.0%
March 20250.6%1.9%1.3%1.8%4.1%
April 20255.2%3.1%1.3%5.6%10.8%
May 202510.1%7.6%11.4%11.7%10.7%
June 202510.5%11.9%11.3%11.5%10.9%
July 202511.0%11.9%11.3%11.5%14.4%
August 202511.6%11.9%11.3%19.0%15.0%
September 202515.3%20.1%11.5%10.0%15.0%
October 202515.6%21.9%11.3%15.0%18.1%
November 202515.9%21.9%11.3%n/a17.7%
December 202515.0%21.9%11.3%15.0%16.8%
January 202615.0%21.9%11.3%15.0%16.4%
February 202614.7%16.1%11.3%15.0%14.5%
March 20267.8%11.9%11.3%11.3%11.2%
April 202610.3%11.9%11.3%11.3%11.6%
May 202610.7%11.9%n/a11.3%12.7%
June 202610.4%11.9%11.3%11.3%11.7%
July 202611.4%9.8%11.3%8.9%11.9%
August 202612.5%10.0%11.3%10.0%12.1%

Tariff actions touching this product

When the duty paid on this product changed and stayed changed, for its main suppliers and all countries, newest first, with the Federal Register notices that named the product in the 3 months before. Rates are medians of the 4 months either side, less any usual seasonal swing. A change shows what happened to duty paid, not why; read each notice for what it did.

  1. February–March 2026 · Duty paid: Taiwan 21.9% → 11.9%, all countries 17.2% → 12.1%.
  2. August 2025 · Duty paid: Taiwan 9.8% → 20.1%.
  3. April–May 2025 · Duty paid: Korea, South 0.3% → 10.7%, Germany 1.8% → 11.5%, all countries 3.2% → 12.9%.

Federal Register notices from the last 12 months that list this product's tariff codes. A notice can add a duty, exclude products from one or only mention them, so read each for what it changes. Search the Federal Register for 2836.40

Where it enters the US

Main ports of entry over the 12 months to August 2026: US imports and share.

  1. Oakland, CA$2.7M · 16.2%
  2. Newark, NJ$2.1M · 12.5%
  3. San Francisco, CA$1.9M · 11.4%
  4. Los Angeles, CA$1.8M · 10.5%
  5. Norfolk-Newport News, VA$1.7M · 10.0%

Where US exports go

US exports were $3.3M in August 2026, up 43% from August 2025, and $38.8M over the last 12 months, up 14% on the 12 months before. Fastest-growing market with 3% or more of US exports: India, up 7256%.

MarketLast 12 monthsSharevs 12 months before
Mexico$21.2M54.5%+15%
Canada$4.3M11.1%+8.0%
India$2.3M6.0%+7256%
Japan$1.7M4.3%+8.2%
Spain$1.5M3.9%−7.9%
Brazil$979K2.5%−3.5%
Trinidad and Tobago$926K2.4%+1.0%
France$855K2.2%−38%
Other countries (35)$5.1M13.2%−0.7%
All countries$38.8M100.0%+14%

Markets abroad

Each country's own import figures for this product, from UN Comtrade: the 8 biggest importers outside the US in the latest year each has reported, what they bought from the US, and the change from the year before. Values usually include freight and insurance to the importer's border, so they run a little above US export figures. Countries report a year or more late; 110 have reported 2025 so far.

MarketImportsvs year beforeFrom the USUS share
India$28.0Min 2025−3.8%$3K0.0%
Spain$20.7Min 2025−7.0%$1.8M8.8%
Germany$17.5Min 2025+6.7%$56K0.3%
United Kingdom$15.8Min 2025+11%$655K4.1%
Netherlands$14.5Min 2025+86%$57K0.4%
Turkey$13.8Min 2025−13%$619K4.5%
Australia$13.7Min 2025−0.1%$9K0.1%
France$12.5Min 2025−21%$765K6.1%

The biggest market outside the US is India, which imported $28.0M of this product in 2025, under 0.1% of it from the US.

Of these, imports into the Netherlands grew fastest: up 86% from 2024 to 2025.

Other products under heading 2836: carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate. US trade over the 12 months to August 2026.

ProductUS importsUS exports
Disodium carbonateHS 2836.20$6.2M$1.22B
Lithium carbonatesHS 2836.91$153.8M$28.2M
Carbonates, not elsewhere specified; peroxocarbonates (percarbonates)HS 2836.99$109.8M$46.9M
Sodium hydrogencarbonate (sodium bicarbonate)HS 2836.30$19.4M$101.1M
Calcium carbonateHS 2836.50$28.5M$45.2M
Barium carbonateHS 2836.60$12.4M$1.2M
Strontium carbonateHS 2836.92$11.4M$265K
About these figures
  • Source: US Census Bureau international trade data, not seasonally adjusted, in US dollars. Retrieved November 3, 2026.
  • US imports are general imports at customs value, which excludes freight and insurance. Exports are at free-alongside-ship value.
  • Average price is customs value divided by quantity (kilograms), across all of the product's 10-digit lines.
  • Duty paid is the duty Census calculates on each country's imports for consumption, as a share of their value. It moves with tariff changes, exemptions and the mix of goods within the product.
  • Landed cost adds Census's import charges (freight, insurance and other costs of bringing the goods to the first US port) and calculated duty to the customs value, per unit, across the product's 10-digit lines. It leaves out antidumping and countervailing duties, customs fees and transport inland. Prices are averages across the goods within the code, so a lower one can mean cheaper goods, not the same goods for less.
  • Markets abroad are each country's imports as it reports them to UN Comtrade, in US dollars, usually including freight and insurance. Countries report a year or more late and in their own edition of the HS codes, so one still on an older edition is missing for codes that changed in 2022.
  • Tariff notices are from the Federal Register, matched to this product by the HTS numbers in their text.
  • Census revises recent months, so figures can change slightly. These are estimates for research and planning, not customs or legal advice.

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