Purolite A400 Anion Exchange Resin from Germany
Purolite A400 is a strong base anion exchange resin on polystyrene skeleton for dealkalization and organics removal. Under 3914.00.60.00 as 'Other' ion-exchanger from 3903 polymers, meeting 95% styrene-divinylbenzene content per notes.
Duty Rate — Germany → United States
10%
Rate breakdown
9903.05.3910%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.97, articles the product of a member state of the European Union, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 10 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Document quaternary ammonium functionalization; ensure declaration specifies 'primary forms' to avoid parts classification
• Common issue: confusing with household filters under 3924 exclusion for photo albums but applicable broadly