Dow Water & Process Solutions

DOWEX™ MONOSPHERE™ 550A (OH)

A uniform particle size strong base anion exchange resin for mixed bed demineralization and condensate polishing applications.

Product Name	Type	Matrix	Functional Group
DOWEX MONOSPHERE 550A (OH)	Type I Strong Base Anion	Styrene-DVB, Gel	Quaternary Amine

Guaranteed Sales Specification	Units	OH- Form
Total Exchange Capacity, min.	eq/L	1.1
Total Exchange Capacity, min.	kgr/ft3 as CaCO3	24.0
Water Retention Capacity	%	55 - 65
Uniformity Coefficient		1.10 max.
Particle Size Distribution
Mean Particle Size	μm	590 ± 50
> 850 μm, max.	%	5
<300 μm, max. (50 mesh)	%	0.5
Whole Uncracked Beads, min.	%	95
Crush Strength
Average, min.	g/bead	350
>200 g/bead, min.	%	95
Trace metals, ppm dry resin, max.	Na Fe Cu Al 50 80 40 40
Ionic conversion, min.	OH- Cl- CO3 94% min. 0.5% max. 6% max.

Typical Physical and Chemical Properties	Units	OH- Form
Total Swelling (Cl- → OH-)	%	20
Particle Density	g/mL	1.08
Shipping Weight**	g/L	657
Shipping Weight**	lbs/ft3	41
Heavy metals (as Pb)	ppm dry resin, max.	20

** 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).