Ion-exchangers based on polymers of headings 3901 to 3913, in primary forms
2 declarable lines
Heading 3914 covers ion-exchangers based on polymers of headings 3901 to 3913, in primary forms. The heading has two declarable lines. 3914.00.20.00 covers cholestyramine resin USP and is free; 3914.00.60.00 covers other ion-exchangers at 3.9%.
Products in this heading
- Cation exchange resin beads for water softening
- Anion exchange resin beads for demineralization
- Mixed bed ion exchange resin
- Chelating ion exchange resin
- Polymer-based ion exchange resin powder
- Cholestyramine resin USP
How to choose the right subheading
- Confirm the product works by ion exchange, not just adsorption or simple filtration.
- Confirm the base polymer falls in headings 3901 to 3913.
- Confirm the product is in primary forms such as beads, granules, or powder.
- Check whether the product is cholestyramine resin USP, which has its own line.
- Use the other line for ion-exchangers that do not meet the cholestyramine resin USP description.
Often confused with
- Heading 3802Activated carbon
Adsorbs by surface area and is not a polymer-based ion-exchanger.
- Heading 3903Unfunctionalized polystyrene beads
Base styrene polymer without ion-exchange groups.
- Heading 3926Plastic filter cartridge housing
The housing is a plastic article; the resin inside is classified separately.
- Heading 8421Complete ion-exchange filter unit
A finished filter unit is machinery, not a primary-form resin.
Frequently asked questions
What is the HTS code for cholestyramine resin USP?
Use 3914.00.20.00; its general (MFN) rate is Free.
What is the duty on other ion-exchange resins?
The general (MFN) rate for 3914.00.60.00 is 3.9%.
How do I classify a polymer-based ion-exchanger?
Classify it under heading 3914 if it is an ion-exchanger based on a polymer of headings 3901 to 3913 and in primary forms. Cholestyramine resin USP goes in 3914.00.20.00 at Free; other ion-exchangers go in 3914.00.60.00 at a general (MFN) rate of 3.9%.
Guide written from the official schedule text. Rates quoted are general (MFN) rates; check the line page for trade agreement rates and the classification of your exact product.