Dow Water & Process Solutions

DOWEX™ MARATHON™ MSC

DOWEX™ MARATHON™ MSC resin is a high capacity, macroporous, strong acid cation exchange resin of uniform bead size distribution. It is based on a styrene-divinyl benzene copolymer matrix with sulfonated functional groups. Because of its uniform particle size, this resin offers a number of advantages compared to conventional (polydispersed) macroporous resins, such as improved exchange kinetics during operation, more complete regeneration of the resin and faster, more thorough rinse following regeneration. Due to its highly cross-linked matrix and macroporous structure, this resin has exceptional osmotic shock resistance and oxidative stability.

Product Name	Type	Matrix	Functional Group
DOWEX MARATHON MSC	Strong Acid Cation	Styrene-DVB Macroporous	Sulfonic Acid

Guaranteed Sales Specification	Units	Na+ Form	H+ Form
Total Exchange Capacity, min.	eq/L	1.7	1.6
Total Exchange Capacity, min.	kgr/ft3 as CaCO3	37.1	35.0
Water Retention Capacity	%	44 - 50	50 - 56
Uniformity Coefficient		1.1 max.	1.1 max.

Typical Physical and Chemical Properties	Units	Na+ Form	H+ Form
Whole Beads	%	95 - 100	95 - 100
Mean Particle Size	μm	550 ± 50	575 ± 50
Total Swelling (Na+ → H+)	%	4	4
Particle Density	g/mL	1.28	1.20
Shipping Weight**	g/L	800	760
Shipping Weight**	lbs/ft3	50	47

** 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).