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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.
Low pressure drop characteristics due to uniform spherical bead morphology (0.3–1.2 mm) and high mechanical strength.
Functionalized with sulfonic acid groups for strong-acid cation exchange capacity, ensuring consistent performance across variable pH ranges (1–14).
Designed for high regeneration efficiency with NaCl, reducing brine consumption and operational costs versus conventional gel-type resins.
Industrial boiler feedwater softening in power generation and process steam systems.
Pretreatment for reverse osmosis (RO) and nanofiltration (NF) membranes to prevent scaling by multivalent ions.
Food & beverage production—especially demineralization of process water and syrup decolorization support.
Pharmaceutical-grade purified water (PW) and water-for-injection (WFI) polishing in compliance with USP/EP standards.
Metal finishing wastewater treatment for selective recovery and removal of heavy metal cations (e.g., Ni²⁺, Cu²⁺, Zn²⁺).
| Chemical Type | Strong-acid cation exchange resin, sulfonated macroporous polystyrene-divinylbenzene copolymer |
| Product Form | Moist, spherical beads (sodium form supplied) |
| Appearance | Off-white to light yellow, free-flowing granular solid |
| Mean Particle Size | 0.7–0.9 mm |
| Uniformity Coefficient | ≤ 1.6 |
| Total Exchange Capacity (H⁺ form) | ≥ 1.8 mmol/mL (wet volume) |
| Moisture Content | 45–50 % (as shipped) |
| pH Stability Range | 1–14 |
Q1: What is the primary functional group and ionic form of LEWATIT S 4528?
A: LEWATIT S 4528 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 4528 suitable for food-grade or pharmaceutical water treatment?
A: Yes — LEWATIT S 4528 is manufactured and tested to meet requirements for use in the production of potable water and process water for food and pharmaceutical applications, provided it is operated within validated system parameters and regenerated using food-grade regenerants.
Q3: How does LEWATIT S 4528 compare to standard gel-type cation resins in terms of kinetics and capacity?
A: As a macroporous resin, LEWATIT S 4528 offers improved kinetic performance and higher resistance to fouling compared to conventional gel-type resins, particularly in waters containing organic matter or suspended solids. Its total exchange capacity is slightly lower than high-capacity gel resins but remains highly effective under dynamic service conditions.
Q4: What regeneration chemicals are recommended for LEWATIT S 4528?
A: Sodium chloride (NaCl) is the standard regenerant for softening service. For full cation removal or conversion to hydrogen form, hydrochloric acid (HCl) may be used — always following manufacturer-recommended concentration, flow rate, and contact time guidelines to preserve resin integrity.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
