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With KÖSTER Mortar Tight, it is possible to create a waterproof render, screed or simple sealing slurry on the construction site using sand, cement, and water. KÖSTER Mortar Tight is added to the mixing water.
KÖSTER Mortar Tight improves the density of the mortar structure. It makes the mortar water-repellent (hydrophobic) and promotes self-healing of micro-cracks through crystallization.
As a result, the mortar becomes waterproof and the capillary
absorption capacity is reduced
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