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Highly selective for divalent cations such as Ca²⁺ and Mg²⁺, enabling superior water softening performance.
Optimized macroporous polystyrene matrix ensures excellent physical stability and resistance to osmotic shock.
Low operating pressure drop due to uniform spherical bead morphology and narrow particle size distribution.
Regenerable with standard sodium chloride solutions, supporting sustainable and cost-effective operation.
Complies with global food-contact and potable water standards (e.g., NSF/ANSI 61, EU Regulation (EC) No. 1935/2004).
Industrial boiler feedwater pretreatment for scale prevention.
Pharmaceutical-grade purified water (PW) production in compliance with USP/EP requirements.
Food & beverage process water softening and mineral adjustment.
Electronics manufacturing ultrapure water (UPW) polishing stage.
Municipal drinking water hardness reduction and taste improvement.
| Chemical Type | Strong Acid Cation Exchange Resin (SAC), sulfonated macroporous polystyrene-divinylbenzene copolymer |
| Product Form | Moist, spherical beads |
| Appearance | Opaque amber to light brown beads |
| Functional Group | Sulfonic acid (–SO₃H) |
| Ionic Form | Sodium form (Na⁺) |
| Particle Size Range | 0.45 – 0.75 mm |
| Moisture Content | 45 – 50 % (w/w) |
| Exchange Capacity (min.) | 1.8 meq/mL (Na⁺ form, wet) |
Q1: What is the primary functional group and ionic form of LEWATIT S 6268?
A: LEWATIT S 6268 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, making it suitable for softening and selective cation removal applications.
Q2: Is LEWATIT S 6268 suitable for food-grade or pharmaceutical water treatment?
A: Yes — LEWATIT S 6268 is manufactured and tested to meet requirements for use in the production of potable water and process water in food and pharmaceutical industries. It complies with relevant global regulatory expectations for ion exchange resins used in indirect contact with consumables, subject to proper regeneration and validation protocols.
Q3: How does LEWATIT S 6268 compare to standard gel-type cation resins in terms of kinetic performance and fouling resistance?
A: LEWATIT S 6268 features a macroporous structure, offering enhanced diffusion kinetics and improved resistance to organic fouling compared to conventional gel-type resins. This makes it particularly effective in applications involving feedwaters with moderate levels of natural organic matter or oxidants.
Q4: What regeneration chemicals and typical conditions are recommended for LEWATIT S 6268?
A: Sodium chloride (NaCl) is the standard regenerant for softening service. For full cation exchange capacity recovery, regeneration is typically performed using 8–12% NaCl solution at ambient temperature, with flow rates and contact times aligned with standard fixed-bed ion exchange design practices. Acid regeneration (e.g., HCl or H₂SO₄) may be applied when operating in hydrogen form for demineralization.
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E-mail: wangxingqiang@ericwchem.com
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