Foamaster A-7 Cognis Defoamers / Anti-Foaming Agents ADHESIVE Foamaster® A-7 is a 100% active, liquid defoamer that contains no silicone or mineral oil. Foamaster® A-7 is recommended for adhesive where sensitivity to silicone or mineral oil is of prime importance. A defoamer level of 0.5 % based on the total weight of the material to be defoamed is a good starting point for determining the optimum use level. 100% active defoamer that contains no silicone or mineral oil. Recommended for adhesives where sensitivity to silicone or mineral oil is of prime importance. Use level: 0.5 % on total formulation.