Emulsion targeted at the construction sector offers excellent compatibility with cement without ammonia odor release. Low temperature vitreous transition (Tg) confers its high flexibility when intended for applications in polymer mortars, waterproofing and even bi-component adhesive mortars. As such, it does not require the use of coalescing or plasticizing agents. FORTCRYL 4900 has a good homogenization in the various cementitious systems and can be used directly or even in diluted concentrations. It should be noted that prior tests are required to determine the optimum polymer concentration to achieve stretching and other desired mechanical properties.