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Highly selective for divalent cations such as Ca²⁺ and Mg²⁺, enabling efficient water softening with minimal sodium leakage.
Exceptional physical and chemical stability across a wide pH range (1–14), supporting robust performance in aggressive process environments.
Optimized bead uniformity and high mechanical strength reduce pressure drop and minimize resin fragmentation during hydraulic cycling.
Low total organic carbon (TOC) extractables, meeting stringent requirements for pharmaceutical and ultrapure water applications.
Regenerable with standard NaCl brine solutions, offering cost-effective operation and compatibility with conventional softening systems.
Industrial boiler feedwater softening to prevent scale formation and extend equipment service life.
Pretreatment for reverse osmosis (RO) and electrodeionization (EDI) systems in power generation and microelectronics facilities.
Pharmaceutical-grade purified water (PW) and water for injection (WFI) polishing in GMP-compliant manufacturing.
Food and beverage processing where consistent low-hardness water is critical for product quality and regulatory compliance.
Municipal and commercial drinking water conditioning to meet aesthetic and health-based hardness standards.
| Chemical Type | Strong acid cation exchange resin (sulfonated polystyrene-divinylbenzene matrix) |
| Product Form | Moist, spherical beads |
| Appearance | Opaque amber to light brown beads |
| Functional Group | Sulfonic acid (–SO₃H) |
| Ion Form | Na⁺ form (ready-to-use) |
| Exchange Capacity (min.) | 1.8 mmol/mL (wet volume) |
| Particle Size Range | 0.3–1.2 mm |
| Moisture Content | 45–50 % (w/w) |
Q1: What is the primary functional group and ionic form of LEWATIT S 4328?
A: LEWATIT S 4328 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: Can LEWATIT S 4328 be used in food-grade or pharmaceutical water treatment systems?
A: Yes — LEWATIT S 4328 is manufactured and tested to meet requirements for use in potable water and process water applications where regulatory compliance for indirect food contact is required. Its suitability depends on final system validation and adherence to local health authority guidelines.
Q3: How does LEWATIT S 4328 differ from standard gel-type strong acid cation resins in terms of physical structure and performance?
A: LEWATIT S 4328 features a macroporous structure, offering enhanced kinetic performance, superior resistance to fouling from organic contaminants, and improved stability under variable pH or oxidizing conditions compared to conventional gel-type resins.
Q4: What regeneration chemicals are recommended for LEWATIT S 4328, and how does its regeneration efficiency compare to other cation resins?
A: Sodium chloride (NaCl) is the standard regenerant for softening mode; hydrochloric acid (HCl) or sulfuric acid (H₂SO₄) may be used for full hydrogen-form regeneration. Due to its macroporous morphology, LEWATIT S 4328 typically achieves efficient regeneration with moderate chemical dosages and demonstrates good cycle-to-cycle consistency in industrial service.
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E-mail: wangxingqiang@ericwchem.com
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