Germany, March 11 -- Evonik Coating Additives is expanding its range of high-performance defoamers for waterborne formulations with the launch of TEGO(R) Foamex 8420. This siloxane-based defoamer concentrate is designed for the most 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 foam-stabilizing surfactants like DOSS (diisooctyl sulfosuccinate). The same is true for various pigment grinds and inks and the foam-stabilizing raw materials contained, making them exceptionally difficult to defoam. The...