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Highly uniform spherical beads for consistent hydraulic performance and low pressure drop.
Strong-base Type I functional group with excellent hydroxide (OH⁻) form stability and regeneration efficiency.
Optimized for high total exchange capacity and superior selectivity for multivalent anions such as sulfate and nitrate.
Robust physical and chemical stability across a wide pH range (0–14) and typical service temperatures up to 60 °C.
Low soluble organic carbon (SOC) leaching, supporting stringent water purity requirements in power and microelectronics applications.
Polishing of high-purity water in fossil fuel and nuclear power plant condensate treatment systems.
Final anion removal in ultrapure water (UPW) production for semiconductor manufacturing.
Decarbonation and demineralization in industrial boiler feedwater pretreatment.
Removal of nitrate, sulfate, and silica from municipal and process water streams.
Use in mixed-bed ion exchange systems requiring balanced cation/anion resin kinetics and compatibility.
| Chemical Type | Strong-base anion exchange resin, Type I quaternary ammonium |
| Product Form | OH⁻ (hydroxide) form |
| Appearance | Uniform amber, spherical beads |
| Functional Group | Triethylbenzylammonium |
| Total Exchange Capacity (min) | 1.2 eq/L (dry basis) |
| Moisture Content | 47–53% (as shipped) |
| Particle Size Range | 0.3–1.2 mm (95% retained on 0.3 mm sieve) |
| Uniformity Coefficient (max) | 1.6 |
Q1: What is the primary functional form of DOW 550A OH resin upon delivery?
A: DOW 550A OH is supplied in the hydroxide (OH⁻) ionic form, ready for use in anion exchange applications such as dealkalization, nitrate removal, and sulfate reduction without requiring pre-conversion.
Q2: How does DOW 550A OH differ from standard strong base anion resins in terms of selectivity and regeneration efficiency?
A: DOW 550A OH features a Type I strong base quaternary ammonium functional group with enhanced selectivity for multivalent anions (e.g., SO₄²⁻, NO₃⁻) over monovalent ions like Cl⁻. Its high crosslinking and uniform bead structure support efficient regeneration with sodium hydroxide and improved cycle stability in demanding water treatment systems.
Q3: Can DOW 550A OH be used in mixed-bed deionization systems?
A: Yes — DOW 550A OH is commonly paired with strong acid cation resins (e.g., DOWEX™ 50WX series) in mixed-bed configurations for high-purity water production. Its low total organic carbon (TOC) release and consistent physical integrity help maintain conductivity below 0.1 µS/cm in polishing applications.
Q4: What precautions should be taken during storage and handling?
A: Store in original sealed packaging at temperatures between 5°C and 40°C, avoiding freezing or prolonged exposure to direct sunlight. Keep hydrated — allow beads to remain moist during handling to prevent cracking or shrinkage. Rinse thoroughly before initial service to remove fines and residual manufacturing agents.
Contact With Us:
E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
