ENVIBOND E-221 is an amphoteric dry strength resin specifically developed to increase the strength properties of paper and paperboards. As amphoteric poly acrylamide, ENVIBOND E-221 excellently improves dry strength and z-direction strength. Because it can apply at a wide range of pH, ENVIBOND E-221 is available to use on acid and alkaline condition. Especially, it improves retention and drainage capacity due to the excellent fix ability of fines and anionic trash.
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