Special treatment polypropylene (PP) fibers. When added, they disperse immediately and form a three-dimensional grid, which absorbs shrinkage tendencies and 'prevents' the formation of capillary cracks (drying). They are a reinforcing additive for concrete, cement mortar and lime mortar. They improve flexibility, impact resistance and surface abrasion, as well as their consistency. They combine perfectly with the DUROSTICK emollient emulsifiers and fluidizers. Also, they are not affected by alkalis and acids and their addition, during the homogenization of the concrete, does not damage the walls of the production and pumping machines. Certified according to EN 14889-2.