Byk -028 BYK Chemie Defoamer / Antifoaming agent Acrylic/Acrylate Resins Polyurethane Inks >> Water-based Coatings >> Waterborne INKS Mixture of hydrophobic solids and foam destroying polysiloxanes in polyglycol. BYK®-028 is the standard defoamer for water-based systems and the basis (starting selection) for the testing of a defoamer series. BYK®-028 is suitable for dispersion paints and printing inks with a PVC from 0 to 25 based on acrylate/polyurethane or polyurethane. The defoamer is easy to incorporate. Mixture of hydrophobic solids and foam destroying polysiloxanes in polyglycol. Used in paints and printing inks.