Byk -1790 BYK Chemie Defoamer / Antifoaming agent >> Silicone-free Coatings >> Solvent-Free/ High-Solids Coatings >> UV / Radiation Curing Byk® -1770 is silicone-free mixture of foam destroying polymers. BYK-1790 is silicone-free and suitable for pigmented and clear coatings. The additive is suitable for pigmented und non-pigmented systems. Its high effectiveness is not reduced by pigments, extenders, wax additives, and matting agents. Silicone-free mixture of foam destroying polymers. Used for pigmented and clear coatings.