Hi-Mar DFC-31 Oil-based Thornley Company Defoamers / Anti-Foaming Agents ADHESIVE A highly efficient, stable oil-based defoamer exhibiting rapid knockdown and excellent persistence. A silica-free formulation promotes films free of surface imperfections. It may be used as received or predispersed in water. Stable oil-based defoamer. May be used as received or predispersed in water. Exhibits rapid knockdown and good persistence. Promotes films free of surface imperfections in silica-free formulation.