Liquid Polymer Engineering


High pressure chemical grouting

Gautrain Tunnel

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Liquid Waterproofing was the chosen company contracted to seal the water leakage in the Gautrain tunnel system.
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The Liquid Waterproofing system was chosen out of various bidders to complete the work.
The successful sealing of the Gautrain tunnel in the vicinity of Park Station allowed the station to open for business.
The tunnels from Park Station to Rosebank Station, Rosebank Station to Sandton, and Sandton to Marlboro have also been successfully sealed by Liquid Waterproofing.
Cracks in Concrete
Construction and Wet Joints
Rock Formation and Fissures
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Water Control System

As you are obviously aware, water sealing is a field of vast and varied requirements. However, we pride ourselves as specialists in the control of free flowing or capillary migration, hydrostatic and latent movement of water.
Liquid Sealing operates as a specialist company and is able to deal with all civil engineering and mining water leakages of all types derived from a uniquely experienced background of the toughest engineering environments.
We have an experienced engineering team with an exceptional level of expertise in concrete technology and construction, water control, support and stabilisation techniques.
By retaining a specialist approach, the company is able to deliver on time and within budget and has strict quality controls over all aspects of the operations.
All our components are tried and tested under extreme pressures with high volume water flow. These very high pressures are only limited by the grout pumps itself. Pressures of up to 50 Bar can easily be achieved.
We’ve successfully sealed fissures with water flow rates of more than 1.6 million litres of water per hour.

Cost of P100 Water Control System

Like any superior system, P100 grout treatment is no doubt very cost effective. The cost compares favourably with the cost of alternative sealing methods. The differences are that P100 requires less time and that much fines passages can be penetrated and sealed. The positive sealing effect of P100 makes it possible for experienced personnel to predict the likely success that can be achieved after careful inspection and evaluation of each watermark problem. Contracts for water sealing can therefore be negotiated based on the success rate achieved.


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Poly2Flex can be classified as an emulsion grout. It is a patented polymer blend mixed with additives to promote flow and adhesion. It contains no toxic or hazardous materials other than 0.5% ammonia solution, which is present as a preservative but evaporates within minutes (see attached CSIR report.)
The reaction of Poly2Flex with water depends on the characteristics of the water, such as pH, salinity, mineral content, temperature etc. The formulation of Poly2Flex can be varied to achieve the desired reaction with the specific water being treated. It is therefore essential to carry out tests with water from the area to be treated prior to finalising the formulation.
The rate of water flow as well as the texture of the flow area also influences the selection of the appropriate formulation of Poly2Flex. High flows through large fissures or cracks require stability to achieve better penetration into the aquifer or crack before coagulation. Each case differs.
Poly2Flex can be used under very high pressures and are only limited by the grout pumps itself. Pressures of up to 50 Bar can easily be achieved.
Poly2Flex emulsion is also solidified with a chemical activator. Poly2Flex can be used in wet or dry conditions.
Mainly used in the sealing of porous areas in concrete and rock strata. Waterproofing of concrete type structures like tunnels, mine shaft linings and dam walls.

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DualFlex is a dual component urethane and polymer based resin that reacts rapidly with equal proportions of water to form a flexible, impermeable foam with excellent adhesion to concrete and rock. DualFlex is a low viscosity chemical grout primarily injected into the area of leakage, creating a mechanical and chemical bond, as well as a compression seal. The cured resin is flexible and will resist degradation through thermal expansion and contraction, wet and dry cycles, and freeze and thaw cycles for long periods. Applications: Medium to large cracks or joints in concrete
Excellent to fill and seal medium to large inaccessible areas in structures. Stop infiltration through sewage systems, storm and drain culverts, manholes, utility vaults, large-diameter pipe or similar structures. Excellent for waterproofing tunnels, elevator pits, dams, reservoirs, etc. DualFlex can be used in wet or dry conditions.
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