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    MasterEmaco S 420 

    Rapid-setting high-strength structural repair mortar

    Structural concrete repairs in areas in contact with potable water need a high-strength mortar designed for the job. In short, that means it must be Regulation 31-approved, as well as possessing all the right performance characteristics. MasterEmaco S 420 is a rapid-setting polymer-modified repair mortar designed to meet these demands exactly.

    Where can MasterEmaco S 420 be used?

    MasterEmaco S 420 is suitable for structural repairs of reinforced and non-reinforced concrete, especially where high compressive strengths are required. It’s ideal for repairing damage caused by:

    • ​Corrosion of reinforcement bars
    • Alkali aggregate reaction
    • Impact damage

    The mortar can be applied in layers of 10-50mm.

    What are the benefits of MasterEmaco S 420?

    MasterEmaco S 420 removes the need for separate primers and bonding coats, saving a lot of time by enabling a complete repair in a single operation. Its rapid-setting qualities result in high production rates, reducing access and labour costs.

    Delivering high performance for extreme durability and protection of embedded reinforcement, MasterEmaco S 420 is Regulation 31-approved for contact with potable water after just three days’ curing.

    To find out more, download the datasheet or contact us to discuss your project. You can read more about our MasterEmaco concrete repair range here​.​


    MasterEmaco S 420: Technical Data Sheet

    pdf (146.66 Kb)

    Direct contact

    Chris Gallivan

    Product Manager, Construction Systems - UK & Ireland

    +44 7966123422


    MasterEmaco S 420: Technical Data Sheet

    pdf (146.66 Kb)