Dow Water & Process Solutions

DOWEX™ MARATHON™ MSA

Uniform particle size, high capacity, macroporous strong base anion exchange resin for water demineralization applications.

Product Name	Type	Matrix	Functional Group
DOWEX MARATHON MSA	Type I Strong Base Anion	Styrene-DVB, Macroporous	Quaternary Amine

Guaranteed Sales Specification	Units	Cl- Form
Total Exchange Capacity, min.	eq/L	1.1
Total Exchange Capacity, min.	kgr/ft3 as CaCO3	24.0
Water Retention Capacity	%	56 - 66
Uniformity Coefficient		1.1 max.

Typical Physical and Chemical Properties	Units	Cl- Form
Whole Beads	%	95 - 100
Mean Particle Size	μm	640 ± 50
Total Swelling (Cl- → OH-), approx.	%	15
Particle Density	g/mL	1.06
Shipping Weight**	g/L	670
Shipping Weight**	lbs/ft3	42

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

For additional particle size information, please refer to the Particle Size Distribution Cross Reference Chart (40KB PDF).