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    Sikagard® H 321 (formerly known as MasterProtect® H 321) - A water based, silane/siloxane clear water repellent for masonry surfaces

    What is MasterProtect H 321?

    MasterProtect H 321 is a single component, water-based silane/siloxane blend. MasterProtect H 321 penetrates deep into the substrate where it reacts chemically. The reaction starts immediately as soon as the active ingredients get in contact with the substrate. The reaction time depends on temperature, humidity and nature of the substrate. The treated surface does bead water shortly after application of MasterProtect H 321.

    What is MasterProtect H 321 used for?

    MasterProtect H 321 is a clear penetrating silane/siloxane based water repellent for use on porous and semi-porous substrates such as clay and calcium silicate brick, honed limestone / sandstone and sand-cement render. 

    What are the benefits of MasterProtect ​H 321​​?

    ​​Improves the aesthetics by reducing efflorescence, Surface appearance remains unchanged as MasterProtect H 321 penetrates into the substrate.

    ​​Long term protection due to deep penetration. Ultraviolet and acid rain resistant.
    ​​No influence on moisture vapour permeability.

    Cost effective
    ​​One application only.

    Easy to apply
    Ready to use, no dilution on site guarantees consistent quality. Single component.
    ​​Application equipment and spillages easily cleaned with soapy water.

    Environmentally friendly
    Water based. Reduces volatile organic emissions into the atmosphere.
    ​No dangerous fumes.​


    MasterProtect H 321_MS

    pdf (111.02 Kb)

    MasterProtect H 321_TDS

    pdf (393.21 Kb)


    UAE: +971/48090800
    Oman: +968/24435800
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