Please login with your username and password.


Can’t remember your accounts password?

Can't access your account?

Select your language.

This page is available in the following languages:

    Please select your location

    MasterMatrix UW 450

    Anti-washout concrete admixture for underwater applications​

    How does MasterMatrix UW 450 work?

    MasterMatrix UW 450 anti-washout admixture is a patented, ready-to-use, liquid cellulose-based admixture that is specially developed for underwater concrete applications.

    Concrete containing MasterMatrix UW 450 admixture exhibits superior resistance to washout of cement and fines, while impeding the blending of external water into the plastic concrete.

    MasterMatrix UW 450 admixture meets the requirements of the U.S. Army Corps of Engineers CRD-C 661-06, Specification for Anti-Washout Admixtures for Concrete.

    Recommended uses:

    • All types of underwater concreting where conventional concrete or placing techniques would result in a high percentage of material loss due to washout
    • Mortar and grouting applications where mixtures are typically more fluid and have a higher potential for washout

    What are the unique features of MasterMatrix UW 450?

    • Reduction in washout of cement and fines
    • Reduction in segregation, even with highly fluid, high water-to-cementitious materials ratio concrete mixtures
    • Thixotropic action that provides concrete stiffening after placement
    • Reduction or elimination of concrete bleeding

    What are the benefits of MasterMatrix UW 450?

    • Superior and predictable in-place concrete properties
    • Dewatering costs reduced/eliminated
    • Environmental impact of cement washout in water minimized
    • Flexibility in batching procedures​

    Direct contact

    Master Builders Solutions Technical Support

    Admixture Systems


    Safety Data Sheet (SDS)

    Find all available safety data sheets for this product.

    Product Certifications

    Generate a free certificate of conformance for a specific Master Builders Solutions construction product.

    LEED v4 & v4.1 Teaser Image

    LEED v4 & v4.1

    Search by product or CSI code and download up to date LEED information.

    Related Literature

    MasterMatrix UW 450 Data Sheet

    pdf (225.60 Kb)

    MasterMatrix UW 450 Data Sheet (French)

    pdf (274.53 Kb)

    MasterMatrix UW 450 SDS

    pdf (223.92 Kb)

    MasterMatrix UW 450 SDS

    pdf (165.60 Kb)

    MasterMatrix UW 450 SDS

    pdf (312.60 Kb)

    MasterMatrix UW 450 SDS

    pdf (319.22 Kb)