KOSTER SB Bonding Emulsion is a universally usable synthetic liquid for all cementitious mortars, plasters, and sealing slurries. KOSTER SB Bonding Emulsion is solvent, plasticizer and filler-free. When added to mineral systems, the synthetic liquid increases elasticity and flexibility, and reduces water absorption. It is designed to be used as an additive for KOSTER NB 1 Grey. The material imparts excellent improved protection from water soluble salts, acids and alkalis.