Dehydran F Esters and hydrocarbons Cognis Defoamer / Antifoaming agent Coatings >> Waterborne Use Defoamer for emulsion paints and mortars Composition Blend of esters and hydrocarbons Properties DEHYDRAN F can be used in coatings either to prevent the formation of foam or bubbles during the manufacture and application of the paint (by brush or roller), or to eliminate foam which has developed in the manufacturing process. This may be required e.g. when the formulation or production method have changed. Dosage DEHYDRAN F can be incorporated at any stage of the production. They are generally added in undiluted form. If necessary, emulsions can be prepared by adding two parts of water to one part of DEHYDRAN F but if further water is added, the emulsions will break. To suppress foam during polymerization the defoamer should be added gradually. Continous addition ensures sufficient defoaming effect at any moment. If the total defoamer quantity were added at one time this effect would not be certain due to the influence the emerging polymer particles have on the defoamer. A particularly good effect is obtained when the defoamer is added by spraying. This method of incorporation enables the defoamer to display its spontaneous defoaming properties most effectively.The amount required lies between 0.1 and 0.75%, calculated on the finished batch, depending on the foam intensity and the composition of the polymer emulsion or the paint. The amount giving optimum performance will of course differ from formulation to formulation and should be determined by appropriate tests in each case. This is particularly recommended when using defoamers containing silicone oil, as these types, though showing an excellent performance, may - if overdosed - cause film defects under certain circumstances. Blend of esters and hydrocarbons. Defoamer for emulsion paints. Can be used in coatings either to prevent the formation of foam or bubbles during the manufacture and application of the paint (by brush or roller), or to eliminate foam which has developed in the manufacturing process. This may be required e.g. when the formulation or production method have changed. Can be incorporated at any stage of the production, generally added in undiluted form. If necessary, emulsions can be prepared by adding two parts of water to one part of this product but if further water is added, the emulsions will break. To suppress foam during polymerization the defoamer should be added gradually. Continous addition ensures sufficient defoaming effect at any moment. If the total defoamer quantity were added at one time this effect would not be certain due to the influence the emerging polymer particles have on the defoamer. A particularly good effect is obtained when the defoamer is added by spraying. This method of incorporation enables the defoamer to display its spontaneous defoaming properties most effectively. Recommended usage level: between 0.1 and 0.75%, calculated on the finished batch, depending on the foam intensity and the composition of the polymer emulsion or the paint. If overdosed, film defects could appear.