ACRONAL® S 400 na (to be discontinued 12/31/23; use replacement Acronal 4000) is used mainly for producing flexible mortars, adhesives and coatings. It blends readily with hydraulic binders and can be used to produce ceramic tile adhesives as well as flexible, water-resistant two-component mortars.

A particular application of ACRONAL S 400 na is the production of crack-filling systems and flexible cementitious coatings for flat roofs and walls. It can also be used in combination with asphalt emulsions to produce waterproofing membranes.