An ion-exchange resin or ion-exchange polymer is a or polymer that acts as a means for ion exchange. It is an indissoluble -LRB- or support structure -RRB- normally in the form of wee -LRB- 0.5-1 mm diameter -RRB- microbeads, usually segregated or yellow, fabricated from an animate thing polymer substrate. The beads are typically permeable, a bulky surface area on and interior them. The trapping of ions along with the accompanying release of another ions, and thus the process is called ion exchange.