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Highly selective for divalent cations such as Ca²⁺ and Mg²⁺, enabling superior hardness removal.
Optimized macroporous polystyrene matrix ensures excellent kinetic performance and resistance to fouling.
Stable under repeated regeneration cycles with strong acid (e.g., HCl or H₂SO₄), supporting long service life.
Low osmotic swelling behavior minimizes bed expansion and improves hydraulic stability in fixed-bed systems.
Consistent spherical bead morphology ensures uniform flow distribution and reduced pressure drop.
Industrial boiler feedwater softening in power generation and steam cycle systems.
Pretreatment for reverse osmosis (RO) systems to prevent scaling on membranes.
Process water conditioning in food & beverage manufacturing where low sodium leakage is critical.
Recovery and polishing of condensate in closed-loop heating and cooling circuits.
Hardness control in pharmaceutical-grade purified water (PW) and water-for-injection (WFI) systems.
| Chemical Type | Strongly acidic cation exchange resin (sulfonated polystyrene-divinylbenzene) |
| Product Form | Moist, sodium-form beads |
| Appearance | Opaque, spherical amber beads |
| Functional Group | –SO₃H (sulfonic acid) |
| Matrix Structure | Macroporous |
| Ionic Capacity (min.) | 1.8 mmol/mL (wet volume) |
| Mean Particle Size | 0.4 – 0.7 mm |
| Moisture Content | 45 – 50 % (w/w) |
Q1: What is the primary functional group and ionic form of LEWATIT S 5328?
A: LEWATIT S 5328 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, enabling efficient removal of hardness ions such as Ca²⁺ and Mg²⁺ in water softening applications.
Q2: Is LEWATIT S 5328 suitable for potable water treatment?
A: Yes — LEWATIT S 5328 is designed and widely used for drinking water softening and conditioning. It complies with general regulatory expectations for ion exchange resins intended for contact with potable water, provided it is properly rinsed and regenerated according to standard operational protocols before service.
Q3: How does LEWATIT S 5328 compare to gel-type resins in terms of physical stability and fouling resistance?
A: As a macroporous resin, LEWATIT S 5328 offers enhanced mechanical strength and superior resistance to organic fouling and osmotic shock compared to conventional gel-type cation exchangers. Its porous structure allows better diffusion kinetics in solutions containing suspended solids or higher levels of natural organic matter.
Q4: What regeneration chemicals are typically used with this resin?
A: Sodium chloride (NaCl) brine is the standard regenerant for softening service. In specialized applications requiring full cation removal, hydrochloric acid (HCl) may be used to convert the resin to the hydrogen (H⁺) form, though this requires careful system design and neutralization considerations.
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