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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.
Exceptional chemical and thermal stability, suitable for regeneration with standard acid solutions (e.g., HCl or H₂SO₄).
Consistent spherical bead morphology with narrow particle size distribution for uniform hydraulic performance.
Low operating pressure drop and high bed life due to robust mechanical strength and abrasion resistance.
Drinking water softening in municipal and point-of-use treatment systems.
Pre-treatment for reverse osmosis (RO) and nanofiltration (NF) feed water to prevent scaling.
Industrial boiler feedwater conditioning in power generation and manufacturing facilities.
Food and beverage processing where strict control of calcium and magnesium is required.
Pharmaceutical-grade water purification complying with USP/EP conductivity and metal ion limits.
| Chemical Type | Strong Acid Cation (SAC), Macroporous Polystyrene-DVB |
| Product Form | Na⁺ form (ready-to-use) |
| Appearance | Uniform amber spherical beads |
| Functional Group | Sulfonic acid (–SO₃H) |
| Ion Exchange Capacity (min.) | 1.9 eq/L (dry basis) |
| Moisture Content | 47 – 53 % (as shipped) |
| Particle Size Range | 0.4 – 0.7 mm |
| Uniformity Coefficient (max.) | 1.6 |
Q1: What is the primary functional group and ionic form of LEWATIT S 5128?
A: LEWATIT S 5128 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 base-exchange applications where sodium ions are exchanged for hardness cations like Ca²⁺ and Mg²⁺.
Q2: Can LEWATIT S 5128 be used in potable water treatment systems?
A: Yes — LEWATIT S 5128 is widely used in municipal and residential drinking water softening applications. It complies with common global regulatory frameworks for materials in contact with drinking water when operated within recommended service conditions, including proper regeneration and rinsing protocols to ensure residual sodium levels remain within acceptable limits.
Q3: How does LEWATIT S 5128 differ from standard gel-type strong acid cation resins?
A: LEWATIT S 5128 features a macroporous structure, offering enhanced kinetic performance, superior resistance to organic fouling, and greater stability under variable operating conditions — especially in feedwaters containing oxidants or suspended solids. This makes it particularly robust for industrial process water and challenging pretreatment scenarios compared to conventional gel-type resins.
Q4: What regeneration chemicals and typical dosage ranges are recommended?
A: Sodium chloride (NaCl) is the standard regenerant. Regeneration efficiency depends on flow rate, concentration, temperature, and bed depth — but typical NaCl dosage ranges from 80 to 150 g/L of resin volume. Optimized regeneration can be achieved using controlled brine concentration (6–10% w/w) and appropriate contact time, with full operational guidance provided in the technical data sheet.
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