| Not official USP-NF text | Column Equivalency Information | |
| PACKING | Strongly acidic cation exchange resin consisting of 8% sulfonated crosslinked styrene divinylbenzene copolymer with a sulfonic acid group in the hydrogen form, 63 to 250 µm in diameter. | |
| L65 | BRAND NAME | MANUFACTURER |
| AG 50W-X2 | BioRad Labs | |