6 pure acrylic emulsion 0 5 coalescent and 0 1 associative thickener is prepared in cowlex type disperser in order to provide the necessary agitation to obtain a homogeneous mixture in the preparation of the second binder formulation b a mixture is also made in a cowlex type disperser with the following components 15 0 water 0 4 cellulose ether thickener 0 5 antifoaming agent 1 4 dispersant 1 4 wetting agent 0 2 silane 0 1 fungicide algaecide 2 0 titanium dioxide 36 0 calcium carbonate 40 0 pure acrylic emulsion 1 1 coalescent 0 8 associative thickener and 0 5 biocide the nonwoven fabric is impregnated with the formulation a by means of a foulard process once impregnated it passes through drying towers where the mixture components are structurally consolidated the temperature of the rollers may vary between 130 u00b0 c and 145 u00b0 c and the manufacturing speed may be between 1 and 2 meters second subsequently formulation b is incorporated by the knife over roller method whereby the pores are sealed and the thickness is adjusted between 1 20 and 1 50 millimeters thus obtaining a smooth and uniform finish the finished material is passed through a drying oven with hot air recirculation between 70 u00b0 c and 80 u00b0 c at a.