BYK-9890 is an aqueous emulsion of a polyether-modified polydimethylsiloxane surface additive. BYK-9890 improves water and dirt repellency, scratch resistance, and slip for various applications. As an additive, BYK-9890 enhances the performance of formulations by protecting surfaces from damage and soiling. It can be easily incorporated at recommended levels of 3-6% without affecting foam stability. BYK-9890 is suitable for use in polishes and care products where extended durability and ease of maintenance are important.