DOWEX™ MONOSPHERE™ M-31

A uniform bead size strong acid catalyst. This is our highest performance catalyst for MTBE/TAME.

Product Name Type Matrix Functional Group
DOWEX MONOSPHERE M-31 Strong Acid Cation Styrene-DVB, Macroporous Sulfonic Acid


Typical Physical and Chemical Properties Units H+ Form
Physical Form Hard opaque beads
Typical Surface Area m2/g 30
Average Pore Diameter Angstroms 220
Pore Volume % 33
Water Retention Capacity % 50 - 54 by wt.
Whole Beads % 99 min.
Particle Size Distribution microns 575 ± 50
     400-650 microns % > 95
     Through 40 mesh % 1% max.
Shipping Weight** kg/m3 766
Shipping Weight** lbs/ft3 48
Friablity avg. g/bead 400
Wet Volume Acid Capacity meq/mL, min. 1.85
Dry Weight Acid Capacity meq/g, min. 5.0



** 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