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

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HS 2933.71

6-hexanelactam (epsilon-caprolactam)

In short

  • The US imported $2.1M of this product over the 12 months to August 2026, down 83% on the year before.
  • Germany is the largest supplier, with 72.1% of US imports; Belgium is next, with 16.8%.
  • Belgium is the cheapest main supplier before and after freight and duty, landing at $2.77/kg.
  • Duty paid averaged 10.7% of the value of imports in August 2026, down 5.8 points on a year earlier.
  • Germany is gaining share: 26.2% over the last 12 months, up from 2.2%.
  • US exports were $76.3M over the last 12 months; the largest market is Canada, with 36.1%.

US imports, Aug 2026

$535K

↑ +210% vs Aug 2025

Last 12 months

$2.1M

↓ −83% vs the 12 months before

Average duty paid

10.7%

↓ −5.8 pts vs Aug 2025

Top supplier

Germany

72.1% 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.

Aug2025SepOctNovDecJan2026FebMarAprMayJunJulAug
Show the numbers
MonthUS imports
August 2025$172K
September 2025$144K
October 2025$269K
November 2025$124K
December 2025$82K
January 2026$85K
February 2026$317K
March 2026$32K
April 2026$47K
May 2026$116K
June 2026$260K
July 2026$46K
August 2026$535K

What changed

  • US imports were $535K in August 2026, up 1057% from July 2026 and up 210% from August 2025.
  • Over the 12 months to August 2026 they totalled $2.1M, down 83% on the 12 months before.
  • Biggest moves in market share since July 2026: Germany up from 0.0% to 72.1%, Spain down from 100.0% to 0.0%.

US trade by year

US imports were $2.1M in the 12 months to Aug 2026, down 88% on the 12 months to Aug 2017. US exports were $76.3M, up 41%. In January 2017 the HS 2017 revision moved some goods between this code and 2939.80, so part of a change across the dashed line can be the revision. 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.

2017201820192020202120222023202420252026HS 2017Duty ↑
Show the numbers
PeriodUS imports
12 months to Aug 2017$17.9M
12 months to Aug 2018$43.6M
12 months to Aug 2019$51.2M
12 months to Aug 2020$26.4M
12 months to Aug 2021$12.8M
12 months to Aug 2022$14.6M
12 months to Aug 2023$5.2M
12 months to Aug 2024$3.4M
12 months to Aug 2025$11.9M
12 months to Aug 2026$2.1M
  • Belgium
  • Germany
  • Japan
  • China
  • All countries
Share of US imports
Show the numbers
PeriodBelgiumGermanyJapanChina
12 months to Aug 201710.6%2.6%0.6%1.0%
12 months to Aug 20184.0%0.9%0.8%0.5%
12 months to Aug 20194.9%0.8%0.9%0.0%
12 months to Aug 20207.5%1.3%2.4%0.0%
12 months to Aug 202118.6%2.2%2.4%0.0%
12 months to Aug 202227.9%2.1%1.4%0.0%
12 months to Aug 202369.7%2.8%16.3%0.0%
12 months to Aug 202469.2%11.1%14.5%0.4%
12 months to Aug 202591.5%2.2%4.2%0.1%
12 months to Aug 202638.7%26.2%15.6%7.8%
Duty paid, % of value
Show the numbers
PeriodBelgiumGermanyJapanChinaAll countries
12 months to Aug 20176.5%6.5%6.5%6.5%2.2%
12 months to Aug 20186.5%6.5%6.5%6.5%0.9%
12 months to Aug 20196.5%6.5%6.5%16.5%1.1%
12 months to Aug 20206.5%6.5%6.5%n/a1.1%
12 months to Aug 20216.5%6.5%6.5%n/a4.0%
12 months to Aug 20226.5%6.5%6.5%n/a3.2%
12 months to Aug 20236.5%6.5%6.5%n/a6.5%
12 months to Aug 20246.5%6.5%6.5%31.5%6.6%
12 months to Aug 20257.0%6.5%12.7%31.5%7.2%
12 months to Aug 202614.8%12.5%13.1%7.1%14.2%
PeriodUS importsDuty paidUS exports
12 months to Aug 2026$2.1M−83%14.2%+7.0 pts$76.3M+33%
12 months to Aug 2025$11.9M+254%7.2%+0.6 pts$57.4M−17%
12 months to Aug 2024$3.4M−35%6.6%+0.1 pts$69.0M+19%
12 months to Aug 2023$5.2M−64%6.5%+3.3 pts$57.8M+5.6%
12 months to Aug 2022$14.6M+14%3.2%−0.8 pts$54.7M−24%
12 months to Aug 2021$12.8M−52%4.0%+2.9 pts$71.6M−3.8%
12 months to Aug 2020$26.4M−48%1.1%0.0 pts$74.5M+54%
12 months to Aug 2019$51.2M+17%1.1%+0.2 pts$48.4M−2.3%
12 months to Aug 2018$43.6M+144%0.9%−1.4 pts$49.5M−8.6%
12 months to Aug 2017HS 2017 revision$17.9M2.2%$54.2M

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
Germany$386K72.1%new$3.21/kg10.0%
Belgium$90K16.8%new$2.32/kg10.0%
India$59K11.1%new$2.89/kg16.5%
All countries$535K100.0%$2.98/kg+25%10.7%−5.8 pts

The 3 largest suppliers had 80.5% 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
Belgium$2.37/kg$0.09/kg3.9% of price$0.31/kg13.3% of price$2.77/kg+26%
Spain$2.58/kg$0.30/kg11.6% of price$0.43/kg16.5% of price$3.30/kg
India$2.89/kg$0.13/kg4.3% of price$0.48/kg16.5% of price$3.49/kg
Germany$3.21/kg$0.01/kg0.2% of price$0.32/kg10.0% of price$3.54/kg
China$11.10/kg$0.05/kg0.5% of price$0.00/kg0.0% of price$11.15/kg
All countries$3.22/kg$0.08/kg2.4% of price$0.33/kg10.2% of price$3.63/kg+45%

Landed at a US port, Belgium was cheapest, at $2.77/kg: 16.1% below Spain.

Landed cost from Belgium rose 26% on a year earlier, to $2.77/kg, mostly on price: $1.80/kg then, $2.37/kg now.

How the market is shifting

Germany gained the most share: 26.2% of US imports over the last 12 months, up from 2.2% in the 12 months before. Belgium lost the most: 38.7%, down from 91.5%. 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.

  • Belgium
  • Germany
  • Japan
  • China
  • All countries
Share of US imports
Show the numbers
MonthBelgiumGermanyJapanChina
September 202481.7%0.0%16.5%1.7%
October 202499.7%0.0%0.0%0.0%
November 202435.6%46.3%0.0%0.0%
December 202482.9%0.0%0.0%0.0%
January 202574.0%0.0%8.9%0.0%
February 2025100.0%0.0%0.0%0.0%
March 202566.7%22.8%10.4%0.0%
April 202591.1%0.0%0.0%0.0%
May 202560.6%19.9%19.5%0.0%
June 2025100.0%0.0%0.0%0.0%
July 202564.1%0.0%35.9%0.0%
August 20250.0%0.0%100.0%0.0%
September 20250.0%35.3%28.0%0.0%
October 202524.7%0.0%75.3%0.0%
November 202584.0%0.0%0.0%0.0%
December 202538.8%61.2%0.0%0.0%
January 202692.1%0.0%0.0%0.0%
February 202675.3%0.0%24.7%0.0%
March 2026100.0%0.0%0.0%0.0%
April 20260.0%0.0%0.0%57.9%
May 202655.2%44.8%0.0%0.0%
June 202635.0%0.0%0.0%51.1%
July 20260.0%0.0%0.0%0.0%
August 202616.8%72.1%0.0%0.0%
Duty paid, % of value
Show the numbers
MonthBelgiumGermanyJapanChinaAll countries
September 20246.5%n/a6.5%31.5%6.9%
October 20246.5%n/an/an/a6.5%
November 20246.5%6.5%n/an/a5.3%
December 20246.5%n/an/an/a5.4%
January 20256.5%n/a6.5%n/a6.5%
February 20256.5%n/an/an/a6.5%
March 20256.5%6.5%6.5%n/a6.5%
April 202513.0%n/an/an/a12.4%
May 20258.5%6.5%16.5%n/a9.6%
June 202516.5%n/an/an/a16.5%
July 202516.5%n/a16.5%n/a16.5%
August 2025n/an/a16.5%n/a16.5%
September 2025n/a15.0%16.5%n/a30.6%
October 202515.0%n/a15.0%n/a15.0%
November 202515.0%n/an/an/a12.6%
December 202515.0%25.0%n/an/a21.1%
January 202615.0%n/an/an/a13.8%
February 202615.0%n/a6.5%n/a12.9%
March 202616.5%n/an/an/a16.5%
April 2026n/an/an/a41.5%24.0%
May 202616.5%16.5%n/an/a16.5%
June 202616.5%n/an/a0.0%8.1%
July 2026n/an/an/an/a16.5%
August 202610.0%10.0%n/an/a10.7%

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. April–May 2025 · Duty paid: Belgium 6.5% → 13.0%, all countries 6.5% → 16.5%.

Where it enters the US

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

  1. Seattle, WA$566K · 27.5%
  2. Norfolk-Newport News, VA$549K · 26.7%
  3. Tacoma, WA$321K · 15.6%
  4. Chicago, IL$133K · 6.5%
  5. Philadelphia, PA$128K · 6.2%

Where US exports go

US exports were $5.5M in August 2026, down 27% from August 2025, and $76.3M over the last 12 months, up 33% on the 12 months before. Fastest-growing market with 3% or more of US exports: Slovenia, up 203%.

MarketLast 12 monthsSharevs 12 months before
Canada$27.6M36.1%−7.3%
India$17.5M23.0%+147%
Slovenia$11.8M15.5%+203%
Turkey$4.1M5.4%−25%
Colombia$3.7M4.9%+25%
Mexico$3.4M4.4%+56%
Italy$3.3M4.3%−24%
Belgium$2.5M3.3%new
Other countries (10)$2.4M3.1%+74%
All countries$76.3M100.0%+33%

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; 62 have reported 2025 so far.

MarketImportsvs year beforeFrom the USUS share
Germany$406.7Min 2025−17%$18K0.0%
Taiwan$234.0Min 2024+31%$5.3M2.3%
China$168.3Min 2025−26%$4840.0%
Italy$125.0Min 2025−25%$7.0M5.6%
India$85.9Min 2025−0.2%$10.2M11.9%
Switzerland$42.9Min 2025−10%$1K0.0%
Slovenia$42.5Min 2025−15%$6.9M16.3%
Canada$30.0Min 2025−7.8%$30.0M100.0%

The biggest market outside the US is Germany, which imported $406.7M of this product in 2025, under 0.1% of it from the US.

The US supplies 100.0% of imports into Canada, but under 10% into Germany, Taiwan and China.

Of these, imports into Taiwan grew fastest: up 31% from 2023 to 2024.

Other products under heading 2933: heterocyclic compounds with nitrogen hetero-atom(s) only. US trade over the 12 months to August 2026.

ProductUS importsUS exports
Heterocyclic compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structue, not elsewhere specifiedHS 2933.39$1.22B$757.5M
Heterocyclic compounds with nitrogen hetero-atom(s) only, not elsewhere specifiedHS 2933.99$1.50B$388.7M
Heterocyclic compounds containing a pyrimidine ring (hydrogenated or not) or a piperazine ring in the structure, not elsewhere specifiedHS 2933.59$1.02B$336.1M
Lactams (excluding 6-hexanelactam), not elsewhere specifiedHS 2933.79$560.7M$127.6M
Heterocyclic compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, not elsewhere specifiedHS 2933.19$534.8M$41.6M
Heterocyclic compounds (excluding melamine) containing an unfused triazine ring (whether or not hydrogenated) in the structure, not elsewhere specifiedHS 2933.69$370.0M$139.8M
Heterocyclic compounds containing an unfused imidazole ring (wether or not hydrogenated) in the structure, not elsewhere specifiedHS 2933.29$115.1M$133.3M
Heterocyclic compounds containing a quinoline or isoquinoline ring-system (whether or not hydrogenated), not further fused, not elsewhere specifiedHS 2933.49$94.7M$15.7M
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.
  • 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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