C-8FM
Prominent Systems' C8 FM -Na resin is a high-capacity, conventional
gel polystyrene strong acid cation exchange resin designed for use in
residential or industrial water softening equipment. Cation resin in
sodium form removes hardness ions such as calcium and magnesium by
replacing them with sodium. When the resin bed is exhausted the hardness
ions begin to pass through the bed. Functionality is returned by
regeneration with concentrated sodium or potassium chloride solution.
The capacity obtained depends largely on the amount of salt used in the
regeneration. Typically 15 lbs of sodium chloride per ft
3 is
used to obtain maximum capacity of up to 32,000 grains per ft
3.
Prominent Systems' C8 FM -Na resin is also effective dissolved iron,
manganese, and also suspended matter by virtue of the filtering action
of the bed. Best for countercurrent regeneration.
Typical Physical, Chemical & Operating Characteristics
Polymer Structure:
Physical Form and Appearance:
Whole Bead Count:
Functional Groups:
Ionic Form (as shipped):
Shipping Weight, approx.:
Mesh Size (U.S. Std):
Moisture retention, Na+ form:
Swelling, Na+—>H+:
Total Capacity in sodium form:
pH Range, Stability: |
Polystyrene 8% cross linked with
Divinylbenzene
mine mesh amber spherical beads
90% Min.
Polystyrene sulfonate
Na+
850 g/l (53 lb./ft.3)
40-70
45–50%
5% max.
1.9 meq/ml
0–14 |
CHEMICAL AND THERMAL STABILITY
Prominent Systems' C8 FM -Na resin is insoluble in dilute or moderately
concentrated acids, alkalies, and in all common solvents. However,
exposure to >1 ppm of free chlorine, “hypochlorite” ions, or other
strong oxidizing agents over long periods of time will eventually break
down the crosslinking. Temperature over 30
oC (85
oF)
will accelrate the oxidation. This will tend to increase the moisture
retention of the resin, decreasing it s mechanical strength, as well as
generating small amounts of extractable breakdown products. Like all
conventional Polystyrene sulfonated resins, it is thermally stable to
higher than 138
oC (280
oF) in the alkali (for
instance, sodium) or alkaline earth (calcium and magnesium) salt forms.
The free acid form tends to hydrolyze in water temperatures appreciably
higher than 120
oC (250
oF) thereby losing
capacity, as the functional groups are gradually replaced by hydroxyl
groups.
