The impregnation hydrophobic VHCT for architectural concrete

VHCT hydrophobic impregnate for architectural concrete

PRODUCT DESCRIPTION hydrophobic impregnate, colourless product for impregnating mineral

surfaces, on the basis of siloxane resins and water glass.


colourless protection against rain; hydrophobisation of concrete, structural elements of concrete, plasters, cellular concrete, brick cladding, concrete cladding panels, natural stone.

Examples of application

  • protecting architectural concrete slabs from heavy soiling
  • preventive protection of architectural concrete against carbonation.
  • colourless hydrophobic protection of historic buildings or building of specific architecture
  • hydrophobic protection of concrete walls made of concrete, brick, synthetic stone and absorbent ceramic tiles


the impregnate is a colourless liquid based on siloxane resins containing solvent, characterized by a high capacity for impregnating all absorbent mineral materials used in construction. When applied to an absorbent surface, the impregnate penetrates deeply into the substrate and reacts with moisture, causing the hydrophobisation of pores and capillaries. Thanks to these properties, the hydrophobic impregnate protects against aggressive atmospheric agents, which could penetrate into the material together with water, without changing the appearance of the surface.

The impregnate is characterized by high resistance to UV radiation. Impregnation with the products is insufficient as waterproofing of:

  • horizontal surfaces (terraces, balconies);
  • underground floors;
  • water tanks;
  • plaster surfaces;
  • synthetic plasters and surfaces painted with synthetic paints. Before working with the VHCT product, carry out tests to determine its impact on a possible change in color of natural stone, coloured plasters or other types of substrates characterized by heterogeneous absorption.


Preparation of substrate: the substrate must be dry, strong, durable and stable, free of dust, paint, waxes, varnishes and other substances reducing the impregnate penetration into the substrate. The choice of a cleaning method depends on the degree of soiling of the old substrate, usually it is sufficient to it wash with cold water. Hot water or steam cleaning is recommended when the surface is contaminated with grease or oil. Soiled surfaces should be cleaned with a brush and then carefully vacuumed with compressed air. The impregnate is a ready-to-use product, it must not be thinned with water or solvents. The effectiveness and durability of the hydrophobic activity of the product depends on the depth of its penetration into the material. The absorbency parameter depends on the porosity of the protected material and the amount of the product applied. In case of large surfaces, apply the impregnate by spraying, whereas small spaces and areas with lots of windows can be covered with a roller. The impregnate is applied once until the surface is completely saturated. Remove the excess immediately from the surface with a dry sponge roller. Surface protected with the product cannot be painted later: painting the surface should be carried out before impregnation using inorganic paints (e.g. silicate paints). In any case, it is advisable to carry out a possible colour change test


The impregnate contains flammable solvents, harmful and hazardous to the aquatic environment. During application, it is advisable to use safety goggles and comply with all recommendations for flammable products: do not store near sources of ignition – no smoking. During application in a closed room, ensure good ventilation. Clothes soiled with the impregnate must be changed immediately. Product residues should be treated as a hazardous substance. Cleaning: Tools and equipment used for impregnation can be cleaned with solvents (petrol, turpentine substitutes, etc.).


the impregnate is best applied before assembling wall panels; carry out a test on 1-2 elements. When completely dry, if there are no contraindications, continue on the remaining elements. Impregnate only dry elements


depends on the substrate absorbency and amounts to:

Concrete: 0.15 – 0.30 kg/m² per layer.

Cement plaster: 0.25 – 0.60 kg/m² per layer

Natural stone: 0.10 – 0.30 kg/m² per layer.


containers 1kg