… Ion-exchangers based on polymers of headings 39.01 to 39.13, in primary forms. …
Explanatory notes
… 39.14 ‑ Ion-exchangers based on polymers of headings 39.01 to 39.13, in primary forms. … Ion‑exchangers of this heading are cross‑linked polymers, generally in granular form, containing active ionic groups (usually sulphonic, carboxylic, phenolic or amino groups). …