Harmonized System
U.S. imports of ion-exchange resins based on plastics, in primary forms (HS 391400) totaled $31.2M in August 2026, imported from 35 countries.
Importers of Ion-Exchange Resins Based on Plastics, in Primary Forms paid $4.0M in duties in August 2026, an effective tariff rate of 12.96% of the $31.2M imported — duty actually collected as a share of that value, not the published tariff schedule. Ion-Exchange Resins Based on Plastics, in Primary Forms imports of $31.2M in August 2026 ran 13% above the year-to-date monthly average of $27.7M.
Last updated: August 2026 dataPolymer-based ion-exchange resins are critical separation and purification materials used in water treatment, pharmaceutical manufacturing, food processing, and chemical refining. The US tariff schedule distinguishes cholestyramine resin USP (3914002000) — a pharmaceutical-grade bile acid sequestrant — from all other polymer-based ion exchangers (3914006000), reflecting the drug-substance status of the former. Sweden and Germany are among the leading suppliers, consistent with European dominance in specialty resin manufacturing. Cholestyramine resin USP entries are subject to FDA review as a drug substance, and importers should ensure the foreign manufacturer holds appropriate FDA registration and that shipments are accompanied by certificates of analysis meeting USP specifications.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
672 shipments/mo
Cholestyramine resin USP (3914002000) is a pharmaceutical active ingredient used to lower cholesterol, and its USP designation signals drug-substance status. CBP and FDA treat it differently from industrial ion-exchange resins: it requires FDA admissibility review, and the manufacturing facility must be registered with FDA. Other ion-exchange resins used in water softening, chemical processing, or food purification fall under 3914006000 and do not carry the same drug-substance compliance burden.
Ion-exchange resins originating from China may be subject to Section 301 tariffs depending on the specific product and applicable exclusions. Importers sourcing from China should verify current Section 301 applicability for their specific resin type and consult a licensed customs broker to confirm the correct duty treatment at time of entry.
HSChapter 39
Trade Directory
List your company under HS 391400 — Ion-Exchange Resins Based on Plastics, in Primary Forms, so the companies trading it can find you. Be the first supplier listed.
Subheading 1 of 1 in heading 3914
Subheading 391400 · $31.2M of $31.2M
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 |
|---|---|---|---|---|---|
| 3914006000 | Ion-Exchangrs Based on Polymrs of 3901-3913, NESOI | $31.2M | 12.96% | 91.25% | $4.0M |
| 3914002000 | (Cholestyramine Resin Usp) | $988 | 21.26% | 56.68% | $210 |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3914006000 | Ion-Exchangrs Based on Polymrs of 3901-3913, NESOI | $23.2M |
| 3914002000 | (Cholestyramine Resin Usp) | $325K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$31.2MYoY · free account
Exports
$23.5MYoY · free account
12-mo low · imports
YoY · free accountOver the twelve months to August 2026, the U.S. imported $327.4M of Ion-Exchange Resins Based on Plastics, in Primary Forms.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
China pays 38.7% duty; Sweden 5.1%.
customs district
destination
entry
rate provision · imports
8.6% enters free of duty; duty collected equals 12.96% of total import value.