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HydroTank 315 Waterbar

A high grade, hydrophilic waterbar with high elasticity and high tensile strength, made from a polymer which swells when in contact with moisture. Ideal for sealing structures against water leaks to both cast-in-place concrete and precast construction joints.

The swelling is achieved through hydrophilic acrylate polymers, which are inseparably embedded within the butylene carrier material. This results in high elasticity and exceptional tensile strength, even when fully expanded within the joint.

Due to its high resistance to acids, alkalis and organic solutions, HydroTank 315 Waterbar can be used to seal joints where aggressive water is expected such as within sewage treatment plants, biogas plants and liquid waste holding tanks.

HydroTank 315 Waterbar swells up to 9 times its original size when in contact with water, sealing the joint fully and reliably. The product is particularly suited to sealing non-compressed joints such as at the junction between slab and wall.

  • Key Benefits
  • Typical Applications
  • Suitable Substrates
  • Technical Data
  • Key Benefits

    Key Benefits

    • Resistant to permanent water pressure of 2 bar.
    • Delayed swelling – will not swell during the installation process or during the concrete cure.
    • Swells up to 9 times its original size.
    • Very resistant to the high alkalinity of concrete.
    • Maintains very high elasticity and tensile strength, even when swollen.
    • Age resistant, no embrittlement.
    • Resistant to sewage, chlorine and sulphur.
    • Retains integrity even through many wet/dry cycles.

    Typical Applications

    Typical Applications

    5/10 mm Profile

    Sealing construction joints against water leaks to:

    • Concrete and steel intensive structures.
    • Sewage and waste water tanks.
    • Reservoirs.
    • Biogas plants.
    • Underpinning.

    2 mm Profile

    Sealing construction joints against water leaks to:

    • Pipes and sleeves.
    • Preformed sump chambers.
    • Steel columns.
    • Manholes.

    Suitable Substrates

    Suitable Substrates

    • Concrete.
    • Steel.
    • Brick or concrete block.
    • Ceramic.
    • Plastic.

    Technical Data

    Technical Data

    Installed Performance Result
    Initial delay of swelling 7 days*
    Full swell achieved 28 days
    Increase in mass (Neutral water – 7 pH) 900%
    Increase in mass (High alkaline water – 12.5 pH) 350%
    Increase in mass (Aggressive water – DIN 4030) 330%
    Max swelling pressure (confined within joint) 2.8 N/mm2
    Water resistance (tested) 5.0 bar
    Working water resistance (safety factor of 2.5) 2.0 bar
    Reaction to fire classification B2 Euroclass


    *Newton 315 Polymer-Waterbar is designed to swell when in contact with water. The swelling is retarded so, depending on the pH of the water, the initial swell will commence between 24 and 72 hours after contact, with only a partial swell occurring. After 28 days and after the first swell cycles the product will reach its full swell. It is important with all hydrophilic waterbars that the application should take place just before the placement of the concrete.

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    Our staff are able to provide guidance for projects of all sizes, whether you require some general advice about damp or waterproofing, or support with technical drawings and specifications.

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