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    MasterSeal M 640 - Flexible and elastic single component polyurethane waterproofing membrane

    How does MasterSeal M 640 work?

    MasterSeal M 640 is a single component, polyurethane based, elastomeric coating for roof waterproofing.

    What are MasterSeal M 640 typical applications?

    MasterSeal M 640 is applicable for outdoor use and can be applied on concrete and cement mortars. It is recommended for waterproofing roofs, balconies and terraces.

    What are MasterSeal M 640 main benefits?

    MasterSeal M 640 main features and benefits are:

    • High elasticity and flexibility
    • Excellent adhesion to concrete and mortar. Fully bonded system.
    • Once hardened it is impermeable to water and carbon dioxide.
    • Tar free
    • Easy to apply.
    • Single component and low viscosity.
    • Excellent crack bridging capacity even at low temperatures.
    • Monolithic – no laps, welds or seams.
    • High water vapour permeability - low risk of blistering.
    • Excellent mechanical properties.
    • Resistant to standing water.
    • Can be re-coated after only a few hours.​


    MasterSeal M 640_TDS

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