High-Concentrate Silicone Emulsion Defoamer SEM-60 (60% Active)

PDMS (polydimethylsiloxane) viscosity in defoamer emulsions is a key formulation parameter. Low-viscosity PDMS (350–1000 cSt) spreads rapidly for quick foam knock-down but has weaker persistence. High-viscosity PDMS (10,000–60,000 cSt) provides longer-lasting foam suppression but slower initial response. For waterborne architectural paints (short application window), 5,000–12,500 cSt PDMS combined with hydrophobic silica is the industry optimum, offering fast knock-down plus sustained suppression through filling, rolling, and leveling stages.