Acronal S 400 Acrylic BASF Acrylics/ Acrylates Acronal® S 400 is used for the production of flexible mortars with hydraulic binders for ceramic tiles; flexible, waterproof two-component cementitious coatings; and flexible, cement-containing insulating coatings. The product is often applied in combination with asphalt emulsions and for modifying hydraulic binders and granular aggregates. A particular application of Acronal® S 400 is the production of crack-filling systems and flexible cementitious coatings for flat roofs and walls. Acrylic based resin. Used in construction.