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My coating needs a silicone defoamer, but everything I try results in craters or fisheyes! How can I achieve powerful defoaming without causing surface defects?

Jim Reader
Lead Research Chemist

Air Products’ Surfynol® DF-178 defoamer was developed to provide the defoaming strength of a silicone-based defoamer but with the superior system compatibility needed in higher gloss and clear coat applications. As a result, this 100% active liquid defoamer is suitable for use in a large number of different resin systems. For polyurethane dispersion, polyurethane/acrylic hybrid, and two-component epoxy formulations, Surfynol DF-178 defoamer should be the first choice of the formulator because it enables the production of foam-free, defect-free clear and pigmented coatings. Strong performance in two-component polyurethane, water-based alkyd, acrylic and styrene-acrylic systems, as well as in pigment dispersions, has also been observed. Surfynol DF-178 defoamer also acts as a deaerator to provide strong defoaming and microfoam control in spray applications. Recommended use levels of Surfynol DF-178 defoamer in coatings vary from between 0.1–0.75 wt % on finished systems.
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