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  • Blok-Lok™ Siloxane Water Repellent

    Penetrating Technology for Vertical Surfaces
    Ensures your project is protected from water intrusion, efflorescence, lime, spalling, freeze/thaw damage, stains, mold, mildew, and UV damage. 100% breathable water repellent for vertical concrete, brick and masonry surfaces.

    Natural Finish
    Preserves the look of the surface with a natural permeable finish and will not yellow.

    Safe to use
    Can be applied anywhere in North America because it contains low VOCs, no carcinogens, no odor.

    Easy to apply
    With a flood coat, no masking or taping required and clean up with only soap and water. Warranty up to 5 years.

    Blok-Lok™ Siloxane Water Repellent

    Blok-Lok ™ sets the industry benchmark for siloxane water repellent protection. Designed to protect exterior vertical surfaces in the harshest of climates. Blok-Lok™ is formulated with siloxanes, creating a long chain water repellent barrier deep within the masonry surface.

    Note to Specifier – CSI Reference Codes
    07 19 00 Acrylic, Silane Siloxane, Penetrating Polyester, Hybrid Water Repellents

    Best Tools for Application

    Small Surfaces
    A foam brush is recommended to soak in and saturate your substrate.

    Medium Surfaces
    Use a small hand pump sprayer.

    Large Surfaces
    Use an airless sprayer with a spray tip size between .035mm to .051mm.

    Application Best Practices

    1) Step One: Prepare the surface and confirm surface moisture is less than 25%. Remove dirt, grime, efflorescence, lime run, construction debris, form oils and release agents, chalked materials, loose and peeling paint, mold, mildew, etc. All cracks should be pointed or caulked.
    2) Step Two: Perform a test application to confirm fit and finish.
    3) Step Three: Apply the product according to It’s TDS.
    4) Step Four: Let cure.
    5) Step Five: Perform post application test to assure results are achieved.

    Benefits of Concentrates and How to Mix

    The benefits of specifying Concentrates:

    • Reduces carbon footprint
    • Reduces job site and landfill waste
    • Reduces worker and supply chain fatigue
    1. Refer to the description on the packaging for dilution ratios.
    2. Pour contents of concentrate into an empty container. The container size should be the size of the finished amount of product.
    3. Fill the container with clean water – we recommend distilled water for best results.
    4. Mix lightly with a stir stick.

    Specification and Ordering Options

    Clear

    Substrate Uses and Anticipated Coverage Rates

    Substrate porosity varies due to type of substrate and/or the age of the surface and its exposure to weathering. As a result, coverage rates may also vary. In addition, in certain applications, two coats may be required. Please contact us for coverage estimates. Best practices are to first perform a test application on the substrate, followed by a rilem tube test to ensure adequate coverage/absorption.

    Refer to the product TDS for Surface Preparation and Application Methods.

    Need help? Call 1-888-765-7070 Option 2.

    Substrate Sq Ft / Gallon # Of Coats*
    CMU Block 60-80 2
    Clay Brick 125-150 2
    Stucco 100-150 1
    Dense Masonry Surfaces 125-150 1
    Wood 150-200 1
    Clay Block 50-60 1
    EFIS 80-120 1
    Concrete Curing 250 1

    Testing Data and Product Characteristics

    Testing Data

    ASTM C666 2200 Cycles – No effect
    ASTM D2243 Do Not Freeze
    Wind Driven Rain ASTM E-514-86., 98.7% Leak Red
    Water Pen Fed Spec SS-W-110C, ASTM C140 SS-W-110C, 75% Min Req, 96.8 Leak Red Chloride Ion Intr
    Salt Pounding NCHRP No. 244 Series IV – 95% Red, No. 244 Series II – 83% Red
    Water Abs CMU ASTM C140-75 98.6% Effective
    Water Vapor Trans ASTM D-1653-71 100% Vapor Permeable
    Water Repellency ASTM C67-87 98.6% Effective
    Weathering ASTM G-53 3,500 Hours- No Change
    Surface Burning ASTM E84 Flame Spread 0, Smoke Development 0

    Product Characteristics

    Material Silane/Siloxane
    Active Content 100%
    Volume Solids 40 or 80%(Depends on Dilution)
    Color of Material Milky White
    Odor Slight Odor
    V.O.C. 20 g/L V.O.C. Compliant
    Flash Point Non-Flammable
    pH Value 6
    Viscosity 9.6 Seconds No. 4 Ford Cup
    Weight Approximately 8.7 lbs./Gal.
    Surface Dry/Recoat/Usable Approximately 1 Hour
    Coalescence Cure Time 5 to 7 days

    Approvals, Qualifications and Associations

    Call 1-888-765-7070 Option 2 for additional assistance.

    LAUSD – OESH Approved
    LEED Points Up to 3 Points
    LEED (New Construction) Available
    LEED (New Schools/CHPS) Available
    CARB Compliant
    SCAQMD Compliant
    All Other States and Canada Compliant
    FDA Meets Requirements
    USGBC Member
    APTA Member
    HPD Various Products Approved
    American Institute of Architecture Two Approved CE courses

    We’re Here to Help!

    Call 888-765-7070

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