Vivasil Plaster Additive WB-321 is used for internal walls to improve workability ,water retention,and to reduce cracks in plaster surfaces WB-321 additive is to avoid adverse consequences.in plastering which are in fact air‐entraining agents, which should be used with masonry cements.Vivasil Plaster Additive WB-321 also use in plaster mixes applications for bonding plasters to substrates. A substitute for good surface preparation and workmanship, but also impart good workability to the mix, WB-321 are made by dispersing polymer particles in water to form a polymer emulsion. When these emulsions are added to portland cement concrete, the spheres of polymer will coalesce or come together to form a film that coats the aggregate particles and the hydrating cement grains and seals off voids. The resulting mixture develops higher strength, bonds better to existing concrete or brick surfaces which has a higher resistance to chloride penetration and is more resistant to chemical attack than plain concrete.
