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Unique bentonite seal for waterproofing

Looking for an optimal solution for waterproofing buildings? Bentonite-based sealing systems provide excellent protection against water ingress. These products take advantage of bentonite’s ability to molecularly absorb water, thus increasing its volume several times. Thanks to these properties bentonite products have fantastic waterproofing and sorptive capacity.

All sealants are produced in the Czech Republic

Our product range offers bentonite and polymer sealing tapes, grout and redeveloping mortars, sealants, sealing sheets and liners. We also have waterproofing tapes, granulated bentonite, grout waterproofing and cable ducts in stock. With our wide range of bentonite sealing products suitable for use in ground, civil engineering and water construction, you will be sure to find something to satisfy your needs. Do you need consultation concerning your project? Potřebujete poradit s Vaší realizací? Contact us.

Certifikáty k našim produktům zašleme na vyžádání.

  • Bentonitové těsnící pásy

    Bentonite sealing strips

    Bentonite sealing strips

    Bentonite tapes are ideal for sealing working joints, partition joints and wall penetrations in ground, engineering and water structures. They feature simple and quick mounting.

    When to use a bentonite sealing tape?

    • To seal working joints between concrete slabs and vertical walls.
    • To seal working joints where two materials come into contact, e.g., concrete-to-concrete, stone-to-concrete or steel-to-concrete
    • To seal contact joints between steel pipes and concrete bodies, for example, in swimming pools, sedimentation tanks, reservoirs, etc.
    • To seal joints in tunnels, dams, water management structures, including drinking water tanks.

    What are the technical properties of bentonite insulation strips?

    • A bentonite sealing strip is an elastic bentonite-based profile that has been especially developed for sealing waterproof joints.
    • Thanks to its chemical composition, the strip has the ability to expand when in contact with water – increasing its volume by up to 200%. This creates safe protection against water, including pressurised water. It reliably seals hairline cracks as well. This is even true in aggressive and waste waters.

    How to use modified strip?

    • Do not apply the sealing strip to surfaces with standing water present. Water must be completely removed from the surface.
    • Lay the sealing strip on the underlying concrete surface to ensure perfect contact with the substrate. Bentonite sealing cement can be used for alignment. Then place the reinforcing liner and fix with steel studs in intervals of approx. 25 cm.
    • Concreting may be carried out immediately after the sealing strip is placed.
    • The minimum thickness of concrete above the MQ sealing strip is 7 cm.

    Basic size range of MQ series bentonite sealing tapes


    Designation Dimensions Colour Length Packaging/cardboard box Pieces/pallet
    MQ 10 23 x 18 mm black 5 m 8 pcs 18 cardboard boxes/ 720 m
    MQ 13 20 x 15 mm black 5 m 8 pcs 18 cardboard boxes/ 720 m
    MQ 14 10 x 15 mm black 8 m 12 pcs 18 cardboard boxes/ 1728 m
    MQ 20 20 x 25 mm black 5 m 8 pcs 18 cardboard boxes/ 720 m
    MQ 114 150 x 1.5 mm black 1 roll 5 m, 10 m,
    maximum 20 m


    All bentonite tape sizes are also produced with MQF protective film. This film prolongs the tapes response when in contact with water.


    Do you need advice on sealing working joints with bentonite sealing strips? Contact us.. 



  • MLP - Polymerové těsnící pásky

    MLP – polymer sealing tapes

    Swelling MLP sealing profiles are used as an active system to seal working joints. When in contact with water, these tapes increase their volume, thus preventing water penetration. Unlike bentonite sealing strips, polymer sealing tape, when not attacked by water or moisture, will return to its original size, even repeatedly.

    When to use polymer sealing strip?

    Polymerove tesneni v praxi

    • As an active sealing system for working joints in monolithic buildings and precast concrete
    • It is also suitable for drinking water environments
    • Sealing of chemicals

    What are the technical characteristics?

    • The basic component is acrylate polymers
    • When in contact with water, the swelling sealing tape increases its volume up to three times
    • The corresponding pressure seals the joint, thus preventing water ingress
    • After drying, it returns to its original size

    How to use polymer sealing tape?

    • Apply to a clean surface free of dirt
    • For horizontal joints, smooth the substrate for laying the MLP sealing tape immediately after concrete pouring
    • Fix MLP tape either mechanically or with mounting adhesive
    • The polymer tape must be attached along the entire length of the sub-base

    Do you need advice on sealing working joints with a polymer sealing strip? Contact us.

  • Zálivkové a sanační malty ERGELIT

    ERGELIT grouting and redeveloping mortars

    ERGELIT mortar mixtures used in waterproofing procedures by MEDIUM are cement-bonded, organic and inorganic additive-treated mortars that have high water permeability, adhesiveness and adhesion to other materials. For the professional execution of redevelopment works and the use of all the quality grades of ERGELIT materials, precise preparation of the redeveloped areas, observance of technological procedures during the application of materials and also subsequent treatment of the redeveloped areas immediately after the completion of the works are necessary.

    What are the features of ERGELIT waterproofing mortars?

    • Volume stability and high initial and final strength
    • Resistance to corrosion caused by sewage effluent with pH 3.5-12
    • Resistance to highly aggressive chemical environments according to EN 206 (exposure class XA3)
    • Resistance to abrasion and dynamic stress
    • Waterproof and highly adhesive
    • Resistance to frost and salt

    Would you like advice on which repair mortar to choose from our wide range of mortar mixtures for redevelopment? Contact us.

    Přehled druhů malt a jejich použití

  • Bentonitový těsnící tmel

    Swelling bentonite sealing cement

    Swelling bentonite sealing cement

    Bonding and sealing waterproofing cement MQ 100 MASTER is bentonite-based, containing an anionic tenside as an emulsifier. It is characterised by high elastic adhesion and bonding ability. It can expand after contact with water thanks to its chemical composition.

    When to use waterproofing sealing cement?

    • For bentonite sealing strips application – eliminates any sub-base unevenness and ensures perfect contact with the concrete surface and sealing strip
    • To bond sealing strips in construction and separating joints
    • To bond overlapping bentonite liners and geotextiles
    • To seal cable and pipe ducts, as well as filling of cavities and other cracks in buildings, civil engineering and water management structures

    How to use the waterproof sealing cement?

    • Apply directly to the contact surfaces using a spatula or a sealant gun from a cartridge.
    • Always apply the sealing cement to a dry (maximum damp) sub-base
    • Remove dust and greasy dirt from the sub-base before application


    Not sure how to apply the cement to concrete joints? Contact us.

  • Těsnící plechy

    Sealing sheets for sealing joints

    Sealing sheets for sealing joints

    The sealing sheets are 2 to 6 m long and 15 cm wide with the metal sheet thickness of 0.7 mm (approx. 3 mm thick insulation layer). The special insulation layer is elastic and non-adhesive, made from carborundum sand. Reliably seals construction joints, separates construction grids!

    MQG 150 sheet

    • Sealing sheet for working joints with insulating surface to reliably seal working joints or separate working grids
    • A special layer of carborundum sand ensures a perfect bond with the concrete
    • In the areas of connection, MQG 150 is folded 5 cm over the ends of both sides of the sheet and backed with MQ 100 Master bentonite sealing cement. This 5 cm overlap of the sheets guarantees a perfect seal at the joint.
    • In rounded areas and corners, the MQG 150 sealing sheet can simply be formed – bent as required.

    Bentonite-based MQB 150 aktiv sheet

    • A bentonite-based next-generation sealing sheet with insulation surface for construction joints.
    • Reliably seals construction joints, separates construction grids!
    • Thanks to a special layer of bentonite mixture, its joint sealing capability is extremely high.
    • MQB 150 aktiv has one side (or both sides) coated with a special bentonite-based insulation layer, which is capable of expanding (increases volume by up to 300%) upon contact with water thanks to its chemical composition and thus creates safe protection against the effects of water, even pressurised water.

    MQG těsnící plech se vyrábí v délkách 3-6 metrů, balení je ve svitku.

    MQG tesnici plech ve svitku ve velké velikosti.jpeg

    Do you need advice on sealing working joints with a sealing sheet? Contact us.

  • Bentonitové těsnící rohože EUROBENT

    EUROBENT bentonite sealing liners

    EUROBENT bentonite sealing liners

    Bentonite liners are used whenever a structure needs to be sealed. Mineral sealant at the bottom or top seal of waste dumps or water works (ponds, lakes, retention tanks) can be completely or partially replaced by bentonite liner.

    What are the advantages of the EUROBENT sealing liners?

    • To seal landfills, tanks, canals, tanks, biotopes or compost heaps, for example
    • They contain an absorbent clay mineral with high sealing capacity (bentonite) that binds the surrounding soil moisture
    • Due to the structure of the absorption capacity of bentonite liner, it swells, thus ensuring a high waterproofing capacity of the bentonite liner.
    • The sealing liner is available in three variants.
      • Bentonite content per m2. a) 3,500 g/m2, b) 4,000 g/m2, c) 5,000 g/m2.

    What are the advantages of double bentonite sealing liners?

    • Double bentonite liners (DBR) are insulators comprising two additional sealing components that optimally complement each other – dual protection.
    • The primary sealant is polyethylene film (PE) with the thickness of 0.2, 0.6 to 1.2 mm, applied to geotextile; the secondary sealant is high-quality bentonite.
    • Double bentonite liners substitute all types of sealing materials used in civil engineering, such as bitumen strips or plastic sealing strips of all kinds, etc.

    Do you know which bentonite sealing liner to choose? Contact us.

  • Granulovaný bentonit pro hydroizolace

    Granulated bentonite for waterproofing

    Granulated bentonite granulate – (0.5 to 2 mm) for waterproofing of ecological buildings, substructures or sealing of garden lagoons, ponds and well structures. The backfill of granulated bentonite creates a natural impermeable waterproofing layer.

    What are the properties of the MQ Bento granulate?

    • Sorptive capacity to capture
      • odour vapour and air humidity;
      • spilled oils and other fluids;
      • improves the earth resistance of grounding systems;
      • liquid fractions from livestock bedding.
    • Reclamation properties
      • To fertilise sandy soils and surfaces
      • As an additive for mineral fertilisers, where it prevents their seepage into the subsoil while preventing crusting of the fertiliser during storage
      • To balance the moisture regime of soil substrates used to grow plants
    • Sealing capacity
      • Sealing of buildings and dams of water basins (wells, sumps) against ingress of surface water
      • Sealing of dams and minor seepage cracks to prevent water leakage
      • To ensure subsoil impermeability of parking, storage and assembly areas with the risk of release of harmful substances in the ground water


    Do you need advice on waterproofing underground structures or sealing a garden lagoon? Contact us.

  • Injektážní hydroizolace

    Grouting waterproofing

    MQDuo-injekt grouting systems

    MQDuo-injekt is an active combination of two proven waterproofing systems in a concrete structure. Bentonite sealing tape 20x25 mm with grouting tubing in one product. This combination reliably solves the waterproofing of working joints in monolithic building structures. The standard active length of the MQDuo-inject system is 8 m, upon customer request even 12 m.

    Grouting tubing IHQ 12/6 type

    This grouting waterproofing is used to seal working joints in monolithic and prefabricated building structures. IHQ 12/6 grouting tubing is used in working or expansion joints alone or in combination with sealing sheets, bentonite tapes. They can also be used for multiple grouting.

    What are the advantages of the IHQ 12/6, IHS 12/6 and IHS 18/10 grouting tubing technology?

    • Multiple grouting with the IHQ 12/6 typeInjektáž spáry[4].jpg
    • After being concreted in, the sufficient cross-section of the conveying channel and outlet openings decreases inner friction of the grout and allows for an economical length of grouting.
    • The inner size of the IHS 18/10 grouting tubing allows for three times longer grouting sections.
    • Easy handling and installation
    • Grouting material outlet is secured on all sides
    • Outlet openings lead conically from the inside out, which means there is little resistance to be overcome.
    • The smooth surface prevents unwanted connections between the grouting tubing and concrete
    • Easy installation even after several years (smooth surface does not facilitate encrustation of the tubing in concrete).
    • Very good performance and cost ratio.

    Not sure which grouting tubing to choose? Are you interested in the price of masonry insulation by grouting? Contact us.

  • Kabelovody FLEXIS

    FLEXIS cable ducts

    Flexis cable ducts provide sufficient protection of cables against mechanical damage, backfill pressure loads and loads above the backfill. They also stop moisture and pressurised groundwater. These are multi-purpose cable ducts suitable for laying many types of energy distribution lines in a single protection system. The principle of the FlexiS® cable duct design is integration of multiple HDPE (high-density polyethylene) protective tube pipes.

    What are the advantages of the FLEXIS cable duct?

    • The modular system is assembled from the individual components directly on the installation site.
    • Practical applications underground, in collectors, suspended structures, bridging uneven terrain, roads or watercourses.
    • Application length per joint – from 1 m to 12 m, longer lengths possible.
    • Thanks to its dividers (individual tubes), the cable duct is divided into the appropriate number of longitudinally arranged spaces/chambers, which are interconnected by connectors.
    • Variability and flexibility for individual project requirements and practical use.
    • Meets all requirements for products included in the product system approved for use by Správa železniční dopravní cesty (Railway infrastructure manager).

    Do you need help with laying the FLEXIS cable duct? Contact us.