Purolite A400 Anion Exchange Resin from Mexico
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 — Mexico → United States
13.9%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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