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Highly selective for multivalent cations, especially Ca²⁺ and Mg²⁺, enabling superior hardness removal.
Exceptional chemical and osmotic stability, ensuring long service life in demanding industrial water treatment cycles.
Optimized bead uniformity and narrow particle size distribution for low pressure drop and consistent hydraulic performance.
Low soluble organic carbon (SOC) leaching, meeting stringent requirements for pharmaceutical and electronics-grade water production.
Regenerable with standard NaCl solutions, supporting cost-effective and sustainable operation.
Ultrapure water (UPW) systems for semiconductor manufacturing and microelectronics fabrication.
Pretreatment of feedwater for high-pressure boiler systems in power generation plants.
Pharmaceutical process water purification complying with USP <841> and EP 2.2.58 standards.
Critical polishing step in laboratory-grade water systems requiring low conductivity and minimal ion breakthrough.
Removal of trace heavy metals from wastewater streams prior to discharge or reuse.
| Chemical Type | Strong acid cation exchange resin, sulfonated polystyrene-divinylbenzene matrix |
| Product Form | Moist, spherical beads |
| Appearance | Amber to light brown, translucent beads |
| Functional Group | Sulfonic acid (–SO₃H) |
| Ionic Form | Na⁺ form (standard supply) |
| Exchange Capacity (min.) | 1.8 mmol/mL (wet volume) |
| Moisture Content | 46–50 % (w/w) |
| Particle Size Range | 0.4–0.7 mm |
Q1: What is the primary functional group and ionic form of LEWATIT S 8229?
A: LEWATIT S 8229 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 8229 suitable for use in food-grade or pharmaceutical water treatment systems?
A: Yes — LEWATIT S 8229 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. It is commonly applied in dealkalization, demineralization, and polishing steps within validated water purification systems.
Q3: How does LEWATIT S 8229 compare to standard gel-type cation resins in terms of physical stability and operating capacity?
A: LEWATIT S 8229 features a macroporous structure, offering enhanced mechanical and osmotic stability compared to conventional gel-type resins. This enables reliable performance under variable flow conditions, frequent regeneration cycles, and in feeds containing suspended solids or organic foulants — while maintaining high total exchange capacity and good kinetic efficiency.
Q4: What regeneration chemicals and typical conditions are recommended for LEWATIT S 8229?
A: Sodium form resin is typically regenerated using aqueous sodium chloride (NaCl) solution. Regeneration efficiency depends on concentration, temperature, contact time, and flow rate — with common practice involving 5–10% NaCl at ambient to moderately elevated temperatures. Acid regeneration (e.g., HCl or H₂SO₄) may be used when switching to hydrogen form for full demineralization service.
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