DOWEX™ MONOSPHERE™ 99K/320

Chromatographic separation resin for size exclusion and ion exclusion.

Product Name Type Matrix Functional Group
DOWEX MONOSPHERE 99K/320 Strong Acid Cation Styrene-DVB, Gel Sulfonate


Typical Physical and Chemical Properties Units K+
Total Exchange Capacity, min. eq/L 1.5 (H+ Form)
Water Retention Capacity % 57 - 61 (H+ Form)
Whole Uncracked Beads % 98
Particle Density g/mL 1.32
Shipping Weight**
     Backwashed, Settled, and Drained g/L 800 - 850
     Backwashed, Settled, and Drained lbs/ft3 50 - 53
     Tapped and Settled g/L 815 - 880
     Tapped and Settled lbs/ft3 51 - 55


Bead Size Distribution % µ
Volume Median Diameter 317 +/-15
Broad Range min. 90% 287 - 352
Narrow Range min. 75% 302 - 337
Fine Fines max. 1% <262
Coarse Fines max. 4% <282
Fine Coarse max. 4% >383
Coarse Coarse max. 1% >453



** As per the backwashed and settled density of the resin, determined by ASTM D-2187.




®™* Trademark of The Dow Chemical Company ("Dow") or an affiliated company of Dow
Related Links
Datasheet – English (56KB PDF)
Technical Manual – English (82KB PDF)
FDA Letter – English (50KB PDF)