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Highly selective for divalent cations such as Ca²⁺ and Mg²⁺, enabling efficient softening with minimal sodium leakage.
Exceptional physical and chemical stability in repeated regeneration cycles, ensuring long service life under industrial operating conditions.
Optimized bead uniformity and narrow particle size distribution for low pressure drop and consistent hydraulic performance.
Low osmotic shock sensitivity due to highly cross-linked polystyrene matrix (8% DVB), supporting reliable operation across wide pH and temperature ranges.
Regenerable with standard salt (NaCl) solutions, offering cost-effective and environmentally compatible operational flexibility.
Industrial boiler feedwater softening in power generation and steam systems.
Pretreatment for reverse osmosis (RO) and nanofiltration (NF) membrane systems to prevent scaling.
Process water conditioning in food & beverage, pharmaceutical, and cosmetics manufacturing.
Softening of municipal and commercial potable water supply networks.
Recycled wastewater polishing where strict hardness control is required prior to reuse.
| 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) |
| Crosslinking Degree | 8% divinylbenzene (DVB) |
| Ionic Form | Na⁺ form (ready for service) |
| Particle Size Range | 0.3 – 1.2 mm (95% retained on 0.3 mm sieve) |
| Moisture Content | 48 – 55% (as shipped) |
Q1: What is the primary functional group and ionic form of LEWATIT S 5228?
A: LEWATIT S 5228 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 5228 suitable for food-grade or pharmaceutical water treatment?
A: Yes — LEWATIT S 5228 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 5228 compare to standard gel-type strong acid cation resins in terms of kinetics and capacity?
A: LEWATIT S 5228 features a macroporous structure, offering improved kinetic performance and greater resistance to fouling compared to conventional gel-type resins. Its total exchange capacity is slightly lower than gel types but remains highly effective across variable feedwater qualities, including those with organic or suspended matter.
Q4: What regeneration chemicals and typical conditions are recommended for LEWATIT S 5228?
A: Sodium chloride (NaCl) is the standard regenerant for softening service. For full cation exchange recovery, acid regeneration (e.g., HCl or H₂SO₄) may be applied depending on the target application. Regeneration efficiency depends on concentration, flow rate, temperature, and bed depth — optimized protocols should be developed based on system-specific water analysis and operational goals.
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