Presenting BRB Siloen® MXP5 is a high-performance water-repellent additive in powder form, based on Alkoxy Silane technology, for cementitious mortars dry mix formulation. it protects from water penetration to both bulk and surface of cementitious-based material mixes for exterior as well as for interior applications such as mortars, joint fillers, premixed plasters, grouts, renders and sealing mortar slurries.