D4266-17 – Standard Test Method Technical Guide

📜 Scope, Terminology, and Referenced Documents

ASTM D4266-17, officially titled “Standard Test Methods for Precoat Capacity of Powdered Ion-Exchange Resins,” establishes uniform laboratory procedures for determining the operating ion-exchange capacity of powdered resins used in water treatment. The standard covers two specific materials: powdered anion-exchange resins in the hydroxide form and powdered cation-exchange resins in the hydrogen form. The values stated in SI units are to be regarded as the standard, with inch-pound units given in parentheses for information only.

Section 3 introduces critical definitions specific to this practice. A powdered ion-exchange material is explicitly defined as resin that has undergone post-manufacturing size reduction to less than 300 µm. The term resin dosage refers to the weight of mixed resin applied per unit area of precoatable filter surface, expressed as dry pounds per square foot. Resin floc describes the voluminous aggregate formed when anion and cation resins are slurried together, and resin ratio is the ratio of the dry weights of cation to anion resin. For general terminology, the standard points to Terminology D1129. A comprehensive list of referenced ASTM standards supports these