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Highly stable macroporous polystyrene-divinylbenzene matrix engineered for superior mechanical and osmotic shock resistance.
Optimized strong acid cation exchange functionality with sulfonic acid groups, ensuring consistent high capacity across variable feed conditions.
Excellent regeneration efficiency using standard mineral acids (e.g., HCl or H₂SO₄), minimizing chemical consumption and waste generation.
Low fines generation and uniform spherical bead morphology, supporting low pressure drop and long service life in fixed-bed systems.
Compliant with global food-grade and pharmaceutical regulatory requirements (e.g., FDA 21 CFR §173.25, EU Regulation EC No. 1935/2004).
Ultrapure water production for semiconductor manufacturing and microelectronics rinsing processes.
Pretreatment of boiler feedwater in high-pressure steam generation systems to prevent scale and corrosion.
Softening and demineralization in pharmaceutical process water systems (PW, WFI pre-polishing).
Recovery and purification of metal ions in hydrometallurgical leach solutions (e.g., Ni, Co, Cu).
Catalytic support and acid scavenging in fine chemical synthesis and API purification workflows.
| Chemical Type | Strongly acidic cation exchanger (sulfonated macroporous polystyrene-divinylbenzene) |
| Product Form | Moist, spherical beads |
| Appearance | Opaque amber to brown beads |
| Primary Applications | Water softening, demineralization, ultrapure water polishing, catalytic ion exchange |
| Functional Group | Sulfonic acid (–SO₃H) |
| Ion Form | H⁺ (hydrogen form) as supplied |
| Moisture Content | Approx. 48–52 % (w/w) |
| Particle Size Range | 0.315 – 1.25 mm (≥95 %) |
Q1: What is the primary functional group and ionic form of LEWATIT S 4428?
A: LEWATIT S 4428 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: In which types of industrial water treatment processes is this resin typically deployed?
A: LEWATIT S 4428 is commonly used in demineralization systems, boiler feedwater polishing, and process water softening—particularly where high total capacity, good kinetic performance, and reliable regeneration behavior are required under variable flow and loading conditions.
Q3: How does LEWATIT S 4428 compare to gel-type resins in terms of physical stability and fouling resistance?
A: As a macroporous resin, S 4428 offers enhanced mechanical and osmotic stability compared to conventional gel-type cation exchangers. Its porous structure provides improved resistance to organic fouling and better performance in waters containing suspended solids or oxidizing agents.
Q4: What regeneration chemicals and typical regenerant concentrations are recommended?
A: Sodium chloride (NaCl) is the standard regenerant for softening service. For full cation exchange regeneration, hydrochloric acid (HCl) may be used. Regeneration efficiency depends on concentration, dosage, and contact time—but common practice uses 5–10% NaCl solutions or 2–4% HCl, adjusted per system design and water chemistry.
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