Hi-Mar DFC-503 Nonionic oil-based Thornley Company Defoamers / Anti-Foaming Agents ADHESIVE A highly effective nonionic water dispersible oil-based defoamer. It exhibits fast knockdown and excellent suppression of foam in most adhesive systems. It is effective at low concentrations in promoting smooth surface films. Nonionic water dispersible oil-based defoamer. Exhibits fast knockdown and very good suppression of foam in most adhesive systems. Promotes smooth surface films at low concentrations