Efka 2550 Modified polydimethyl siloxane Efka Additives Defoamer / Antifoaming agent Coatings >> Waterborne General Industrial /Maintenance Pigment concentrates Efka-2550 is a modified polydimethyl siloxane. Efka-2550 can be used as a defoamer in various water-based coating systems and pigment concentrates. Due to its stability in high shear processing it functions well during the application of paints and lacquers. Efka-2550 prevents the entrapment of air during processing steps such as grinding, stirring, pumping etc. Efka-2550 has been developed for water-based industrial coatings and pigment concentrates. Modified polydimethyl siloxane. Prevents entrapment of air during processing steps. Used for water-based industrial coatings and pigment concentrates.