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Highly selective for divalent cations such as Ca²⁺ and Mg²⁺, enabling superior hardness removal in demanding water treatment applications.
Optimized macroporous polystyrene matrix provides excellent physical stability and resistance to osmotic shock during repeated regeneration cycles.
Consistent bead uniformity and narrow particle size distribution ensure low pressure drop and efficient hydraulic performance in industrial columns.
Low soluble organic matter (SOM) release meets stringent regulatory requirements for pharmaceutical and ultrapure water production.
Compatible with standard NaCl regeneration protocols—no specialized chemicals or equipment required for operation.
Industrial boiler feedwater softening in power generation and manufacturing facilities.
Pretreatment for reverse osmosis (RO) systems to prevent scaling on membranes.
Production of purified water (PW) and water for injection (WFI) in pharmaceutical manufacturing.
Food and beverage process water conditioning, including brewing and dairy processing.
Recycled wastewater polishing for closed-loop industrial reuse systems.
| Chemical Type | Strong acid cation exchange resin (sulfonated polystyrene-divinylbenzene) |
| Product Form | Moist, spherical beads |
| Appearance | Opaque amber to light brown beads |
| Functional Group | Sulfonic acid (–SO₃H) |
| Ion Form | Na⁺ form (ready for service) |
| Particle Size Range | 0.315 – 1.25 mm (95% retained on 0.315 mm sieve) |
| Moisture Content | 47 – 53% (w/w) |
| Exchange Capacity (min.) | 1.9 eq/L (Na⁺ form, wet) |
Q1: What is the primary functional group and ionic form of LEWATIT S 2568?
A: LEWATIT S 2568 is a strongly acidic cation exchange resin based on a styrene-divinylbenzene matrix, functionalized with sulfonic acid groups. It is supplied in the sodium (Na⁺) form, enabling efficient removal of hardness ions such as Ca²⁺ and Mg²⁺ in water softening applications.
Q2: Is LEWATIT S 2568 suitable for potable water treatment?
A: Yes — LEWATIT S 2568 is designed and tested for use in drinking water systems. It complies with relevant global regulatory frameworks for materials in contact with potable water, including adherence to general requirements for extractables and structural integrity under typical service conditions.
Q3: How does temperature affect the performance and service life of this resin?
A: LEWATIT S 2568 is engineered for stable operation up to 120 °C, though continuous use above 100 °C may accelerate physical aging. Optimal performance in softening and demineralization is typically achieved between 5 °C and 50 °C. Elevated temperatures can increase kinetic exchange rates but also influence regeneration efficiency and long-term swelling behavior.
Q4: What are key considerations for regenerating LEWATIT S 2568?
A: Regeneration is typically performed using sodium chloride (NaCl) brine at concentrations between 8% and 12%. Flow rate, contact time, and brine volume should be optimized based on service cycle length and influent water quality. Incomplete regeneration or excessive rinse requirements may indicate fouling or channeling, warranting inspection of pre-treatment and bed uniformity.
Q5: Can LEWATIT S 2568 be used in mixed-bed configurations?
A: Yes — it is commonly paired with strong base anion resins (e.g., LEWATIT MP 64 or similar) in mixed-bed deionization systems. Its high crosslinking and uniform particle size support effective separation during backwash and contribute to stable conductivity performance in high-purity water production.
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E-mail: wangxingqiang@ericwchem.com
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