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Lanlang Corp provides variety of anion exchange resins including strong base exchange resin (type I and type II) and weak base exchange resin in chloride or hydroxide form with gel type or macroporous structure.

The strong base anion exchange resin is an anion exchange resin with quaternary ammonium groups incorporated into the styrene frame. Two types with differing alkalinity strengths are: Type I with a trimethyl ammonium group, and Type II with a dimethylethanol ammonium group.
The strongly basic resin is used to produce high purity demineralized water, making use of the capability to strongly adsorb anions.

The weak base anion exchange resins use either a polystyrene or polyacrylic ester frame and a primary-ternary amino group as the functional group. Although the anion of a salt like NaCl or Na2SO4 cannot be exchanged, the exchange of an anion of a mineral acid such as HCl and H2SO4, or the salt of a weak base like NH44Cl can be carried out.