Evonik Coating Additives is expanding its range of high-performance defoamers for waterborne formulations with the launch of TEGO Foamex 8420, a siloxane-based defoamer concentrate designed for demanding defoaming challenges. Foaming during the production of printing inks and overprint varnishes can disrupt the process and hinder ink or coating transfer, resulting in unacceptable print quality. Some waterborne inks and varnishes, particularly overprint varnishes, contain high levels of foa...