Description

Anion Exchange Resin, Strong Basic Quarternary Ammonium (I) A201 is a high-capacity, strongly basic anion exchange resin based on a quaternary ammonium functional group attached to a polystyrene-divinylbenzene matrix. This product is engineered for superior performance in demineralization and deionization processes, effectively removing a wide range of anions from aqueous solutions. It is a critical component for industries requiring high-purity water, such as power generation, pharmaceuticals, and microelectronics. The resin is supplied in the chloride form and is characterized by its robust physical stability and consistent exchange capacity.

Application

• Industrial Water Treatment: Primary application in mixed-bed and separate-bed deionizers for the production of high-purity demineralized water for boilers, cooling towers, and process streams.
• Power Generation: Essential for condensate polishing and makeup water treatment in thermal and nuclear power plants to prevent corrosion and scaling.
• Pharmaceutical & Biotechnology: Used in purification systems to produce Water-for-Injection (WFI) and Purified Water (PW) compliant with USP, EP, and JP pharmacopeias.
• Microelectronics & Semiconductor Manufacturing: Critical for ultrapure water (UPW) production to meet the stringent ionic purity requirements for wafer cleaning and fabrication.
• Chemical Processing: For the removal of acidic impurities, catalysis, and the recovery of valuable anions from process liquors.
• Food & Beverage Industry: Employed in water softening, dealkalization, and nitrate removal processes to ensure water quality meets food-grade standards.

Basic Information

Product Name	Anion Exchange Resin, Strong Basic Quarternary Ammonium (I) A201
CAS No.	39421-71-1
Molecular Formula	(C₂H₄·C₈H₇·C₈H₈N)n (Polymeric structure)
Molecular Weight	N/A (Macroreticular polymer)
Synonyms	Strong Base Anion Exchange Resin Type I; Quaternary Ammonium Polystyrene Resin; A201 Resin; Amberlite IRA-400; Dowex 1; Lewatit M500; Anion exchanger (strongly basic); Polystyrene trimethylbenzylammonium chloride; Gel Type I Anion Resin; Styrene-DVB anion exchange resin
EINECS	Contact for details

Quality Control

Our Anion Exchange Resin A201 is manufactured under a strict quality management system. Each batch is tested against rigorous internal specifications to ensure consistent performance in total exchange capacity, moisture retention, bead integrity, and ionic form. Certificates of Analysis (COA) documenting key parameters are available upon request. We support compliance with relevant water treatment industry standards.

Storage

Preserve in a tightly closed container, protected from light. This resin is hygroscopic (moisture-sensitive) and must be stored in a cool, dry, and well-ventilated area at ambient temperature (15-25°C). The original packaging should be kept sealed to prevent moisture uptake and contamination. Do not allow the product to freeze.

Specification

Item	Specification
Ionic Form as Shipped	Chloride (Cl⁻)
Matrix	Polystyrene-Divinylbenzene (Gel Type)
Functional Group	Quaternary Ammonium (Type I)
Total Exchange Capacity (min.)	1.0 eq/L
Moisture Holding Capacity	42 - 48 %
Particle Size Range	0.3 - 1.2 mm
Uniformity Coefficient (max.)	1.7
Reversible Swelling (Cl⁻ → OH⁻)	18 - 22 %
Maximum Operating Temperature	60 °C (OH⁻ form), 100 °C (Cl⁻ form)

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.