DEFOAMER DFK-25 Used As A Defoamer In Concrete Applications. It is a silicone based defoamer. It shows a strong defoaming effect even when used in small amounts in water-based systems. Product performance is not affected by the pH of the system. Shelf Life: 12 months Packing: 200 kgs/ iron drum net (16tons/FCL); 1000kgs/IBC (18tons/FCL); 20-23 tons/ isotank.