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Highly selective for divalent cations including Ca²⁺, Mg²⁺, and heavy metals in complex water matrices.
Optimized macroporous acrylic matrix providing excellent chemical and osmotic stability across wide pH and temperature ranges.
Low pressure drop and high hydraulic throughput due to uniform spherical bead morphology and narrow particle size distribution.
Regenerable with standard acid solutions (e.g., HCl or H₂SO₄), enabling cost-effective cyclic operation.
Complies with global food-contact and potable water standards including FDA 21 CFR §173.25 and EU Regulation (EC) No 1935/2004.
Removal of hardness ions and trace heavy metals from municipal and industrial process water.
Pretreatment for reverse osmosis and electrodeionization systems in high-purity water production.
Recovery and concentration of valuable metal ions (e.g., Ni²⁺, Co²⁺, Cu²⁺) in hydrometallurgical effluents.
Polishing step in pharmaceutical-grade purified water (PW) and water-for-injection (WFI) systems.
Decolorization and organic load reduction in sugar refinery and beverage industry wastewater streams.
| Chemical Type | Macroporous acrylic chelating resin with iminodiacetic acid functional groups |
| Product Form | Moist, spherical beads |
| Appearance | Light yellow to amber, free-flowing granules |
| Ion Form | Sodium form (Na⁺) |
| Functional Capacity (min.) | 1.8 mmol/mL (wet volume) for Ca²⁺ |
| Particle Size Range | 0.315 – 1.25 mm |
| Moisture Content | 45 – 55 % (w/w) |
| pH Stability Range | 1 – 14 (short-term exposure); 2 – 12 (continuous operation) |
Q1: What is the primary functional group and ionic form of LEWATIT MDS 1268 K 310?
A: LEWATIT MDS 1268 K 310 is a strongly acidic cation exchange resin in the potassium (K⁺) form, based on a sulfonated polystyrene-divinylbenzene matrix. It is specifically designed for selective removal of multivalent cations and softening applications where sodium-free operation is required.
Q2: How does this resin differ from standard sodium-form strong acid cation resins in process performance?
A: Unlike conventional Na⁺-form resins, the potassium form provides higher selectivity for calcium and magnesium over sodium, resulting in improved hardness removal efficiency—particularly in low-sodium or sodium-sensitive applications such as pharmaceutical water polishing or specialty food-grade processing streams.
Q3: Is LEWATIT MDS 1268 K 310 suitable for use in potable water or food-contact systems?
A: Yes, this resin is manufactured and tested to meet general regulatory expectations for indirect food contact and drinking water treatment applications. It complies with relevant global guidelines for ion exchange resins used in water purification, including compliance with FDA 21 CFR §173.25 and EU framework principles for food-contact materials—subject to proper pre-use regeneration and validation per end-user requirements.
Q4: What are the recommended storage conditions to maintain resin integrity?
A: Store in original sealed packaging at temperatures between 5 °C and 40 °C, away from direct sunlight and oxidizing agents. Avoid freezing, as ice formation may damage the bead structure. Once opened, keep moist with deionized water or appropriate brine solution to prevent desiccation and physical shrinkage.
Q5: Can this resin be regenerated in situ, and what regenerant is typically used?
A: Yes, LEWATIT MDS 1268 K 310 is fully regenerable using potassium chloride (KCl) solutions. Regeneration restores the resin’s exchange capacity and maintains its potassium form without introducing sodium ions—making it ideal for continuous low-sodium operation in closed-loop or high-purity systems.
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E-mail: wangxingqiang@ericwchem.com
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