BYK 349 is a highly effective silicone surfactant additive that produces a significant decrease in surface tension. It improves substrate wetting and leveling in aqueous formulations. BYK 349 only marginally stabilizes foam and does not impair recoatability or increase surface slip. It is especially suitable for formulations without co-solvents. BYK 349 enhances performance in applications requiring excellent wetting on various substrates. Its unique properties help achieve uniform coverage and smooth finishes without compromising other qualities. BYK 349 is recommended for use in a variety of aqueous systems where outstanding surface properties are required.