Description
Macroporous Cation Exchange Resin for Softening and Demineralization
Franklin FWXCMP1 is a macroporous strong acid cation resin used for water softening and demineralization in industrial water treatment systems.
The resin has a polystyrene matrix crosslinked with divinylbenzene (DVB) and a sulphonic acid functional group. Its macroporous structure can adsorb soluble organic molecules while providing resistance to osmotic shock, oxidation and mechanical stress.
FWXCMP1 ships in sodium (Na+) form as a cation resin for water softening. It can be converted to hydrogen (H+) form for use as a cation resin for demineralization, typically paired with a strong base anion resin.
Best Suited For
- Water softening in sodium (Na+) form
- Demineralization in hydrogen (H+) form
- Condensate polishing at temperatures up to 120°C
- Softening of sugar solutions
- Feed water with elevated organic content
- Mixed-bed demineralization systems
- Systems exposed to osmotic stress or oxidative conditions
Key Features of Franklin FWXCMP1 Macroporous Strong Acid Cation Resin
- Macroporous polystyrene-DVB structure
- Sulphonic acid functional group
- Adsorbs soluble organic molecules
- Resists osmotic shock and oxidation
- Withstands repeated mechanical stress
- Available in Na+ (softening) or H+ (demineralization) form
- Maximum operating temperature of 120°C
- Total exchange capacity ≥1.8 eq/L
Technical Specifications
| Property | Value |
|---|---|
| Application | Water softening, demineralization |
| Polymer Matrix | Macroporous polystyrene crosslinked with DVB |
| Appearance | Tan, spherical beads |
| Functional Group | Sulphonic acid |
| Ionic Form as Shipped | Na+ |
| Total Exchange Capacity | ≥1.8 eq/L |
| Moisture Retention | 45 to 50% |
| Particle Size Range | 0.315 to 1.25 mm (≥95%) |
| Whole Uncracked Beads After Attrition | ≥96% |
| Bulk Density | 0.77 to 0.85 g/mL |
| Specific Gravity | 1.25 to 1.28 g/mL |
| Effective Size | 0.4 to 0.6 mm |
| Uniformity Coefficient | <1.7 |
| Reversible Swelling (Ca2+ → Na+) | <8% |
| Free Moisture | <2% |
| Max Operating Temperature | 120°C (248°F) |
| pH Range | 0 to 14 |
| Service Flow Rate | 5 to 170 BV/h |
| Regenerant | 10 to 15% NaCl or 4 to 10% HCl |
How FWXCMP1 Works in Softening and Demineralization
In sodium form, FWXCMP1 operates as a macroporous strong acid cation resin for water softening. It exchanges calcium, magnesium and other hardness ions for sodium, reducing total hardness. This is the standard configuration for softening in municipal, commercial and industrial systems.
In hydrogen form, FWXCMP1 is used as a cation resin for demineralization. It removes cations from the feed water and is typically installed upstream of a strong base anion resin. For complete demineralization, it can be paired with a macroporous anion resin such as Franklin FWXA213 to address both cation and organic removal.
The macroporous structure of FWXCMP1 helps resist organic fouling that can reduce the operating capacity of a gel strong acid cation resin over time. As a macroporous cation exchange resin, FWXCMP1 is suitable for surface water, industrial process water and other sources with high organic loading.
Actual performance depends on the feed-water chemistry, organic loading, bed design, flow rate and regeneration procedure.
Selecting the Correct Resin
Choose FWXCMP1 when the treatment system requires a macroporous strong acid cation resin for softening or demineralization in water with elevated organic content. Before ordering, confirm:
- Feed-water analysis (hardness, organics, pH)
- Required ionic form (Na+ for softening, H+ for demineralization)
- Required resin volume
- Service flow rate
- Regeneration method (NaCl or HCl)
- Tank size and minimum bed depth
- Intended treatment objective
For certified potable water applications or systems with low organic loading, a gel strong acid cation resin such as Franklin FWXC008 may be more appropriate.
For other resin types and treatment applications, browse the Franklin Water Treatment collection.
Order Franklin FWXCMP1 from Cleanflow
Buy Franklin FWXCMP1 macroporous strong acid cation resin online for shipment across Canada and the United States. Review the technical specification sheet before selecting the resin volume and ionic form.
For help confirming whether FWXCMP1 fits your system, contact Cleanflow with your feed-water analysis, tank size, service flow rate and treatment objective. Orders over $199 qualify for free shipping, and all purchases are backed by a 30-day return policy.
Frequently Asked Questions
What is macroporous cation resin used for?
Macroporous cation resin is used for water softening and demineralization where feed water contains elevated organic content. The macroporous structure allows the resin to adsorb organic molecules that can foul standard gel cation resin, making it suitable for surface water, industrial process water and condensate polishing.
What is the difference between macroporous and gel cation resin?
The macroporous vs gel cation resin choice depends on organic loading. Macroporous resin has a porous structure that adsorbs and releases organic molecules during regeneration. Gel resin has a tighter matrix that may trap organics over time, reducing capacity.
Can macroporous cation resin be used for water softening?
Yes. FWXCMP1 in sodium form operates as a cation resin for water softening by exchanging calcium and magnesium ions for sodium. It is suitable where organic fouling may affect standard gel resin. For systems with low organic content, gel cation resin may be sufficient.
What is the difference between Na+ and H+ form cation resin?
Cation resin in sodium (Na+) form is used for water softening. In hydrogen (H+) form, it is used for demineralization. Na+ form exchanges hardness ions for sodium. H+ form exchanges cations for hydrogen, lowering pH and preparing the water for anion exchange.
What is the best cation resin for organic fouling resistance?
Macroporous strong acid cation resin is generally more resistant to organic fouling than gel cation resin. The macroporous structure allows organic molecules to reach the active sites and be released during regeneration, helping to maintain capacity over repeated service cycles.
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