Iso-Tek® 8501 Commercial Concrete Sealer

A revolutionary aqueous, solvent-less, silane-based water repellent that is the latest break-through in clear penetrating sealers.

  • Coverage Up to 185 square feet
  • Coats 1
  • VOC Content 80 g/L
  • Finish Natural
  • Warranty 100 Year Warranty
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Iso‐Tek® 8501 is a hydrophobic impregnating sealer used to prevent water and water‐soluble damaging substances from penetrating concrete and mineral substrates. Once impregnated, the change of the surface tension creates a surface environment that is hydrophobic and able to repel water and water-soluble deleterious materials. Iso‐Tek® 8501 dries completely clear, does not darken the concrete, aides in a dramatic reduction of chloride-ion ingress, sulfates, acidic gases, salts and water absorption. Because Iso‐Tek® 8501 is impregnating, rebar in reinforced concrete will resist oxidization, inhibiting rust.


Exceptional when used for:
  • Specially formulated for vertical surfaces
  • Concrete
  • Reinforced concrete
  • Brick/masonry



  • Protection against frost / salt attacks
  • Excellent penetration
  • Seals cracks up to 0.3mm
  • Unrivaled in depth of penetration
  • Provides excellent adhesion for paints
  • Thixotropic and can be applied without loss of material


  • Oxidization (rust corrosion) in steel reinforced concrete
  • Freeze-thaw damage
  • Carbonization
  • Sulfates and acidic gases inhibiting rust


  • Chloride, acidic gasses (e.g.CO 2) and water absorption
  • Absorption of de‐icing salts or chlorides from marine environments
  • Alkalis
  • Chloride-ion ingress and water absorption

Iso-Tek 8500 Rises Above

Iso-Tek 8501 meets or exceeds the following tests:

  • ASTM E-96: Water Vapor Transmission
  • ASTM E-514: Water Penetration
  • ASTM C-672: Scaling Resistance
  • AASHTO T-259: Chloride Ion Penetration
  • NCHRP 244 II/IV: WVT, Chloride Intrusion
  • OHD L-34: Depth of Penetration

Auxiliary Information

  • Description

    Iso‐Tek® 8501 is a unique impregnating agent. It has an outstanding ability to impregnate high‐density concrete and reinforced concrete. Unlike conventional liquid products, Iso‐Tek® 8501 can be applied in just one coat of the desired thickness (at the very most, two coats). The silane active ingredient penetrates the substrate within 30 minutes to several hours, the exact time depending on the porosity and thus quality of the concrete. As the active ingredient is the same as in conventional liquid impregnating agents, impregnation with Iso-Tek® 8501 does not clog the pores or capillaries, nor does it affect its ability to "breathe". Iso-­‐Tek® 8501 is designed to penetrate deeply into concrete so as to afford optimum protection against absorption of water and pollutants as well as freeze / thaw cycles. This effect should not be confused with the "beading" effect imparted by impregnating agents that is often referred to as water repellency. Beading is only a surface effect, and it plays a secondary role in protecting the substrate. Concrete treated with Iso-Tek® 8501 has intially only a moderate beading effect, but this increases after the surface has been wetted.

  • Preparation

    Make sure to avoid contact with skin, eyes and clothing. No respirator is needed when applying this product. Wash your hands after use and do not take internally. Please refer to the product Saftey Data Sheet (SDS) before using.

    The preparation process should be followed to ensure adequate penetration and optimum performance of the sealer. The concrete substrate must be structurally sound, thoroughly dry and clean. Make sure to remove all paints, sealers and/or adhesives before application. The substrate must be clean of oil, grease, dirt, wax, curing compounds, efflorescence and other contaminants that might interfere with the penetration of the sealer. If you are using an acid to clean the concrete, neutralize the surface completely and rinse it with water prior to application. New concrete must be cured at least 28 days before applying Iso‐Tek® 8501. Prior to sealing check your local forecast to make sure that there are no impending threats of perception within 1 day of application. It is recommended the sealer be tested in an inconspicuous area to ensure the desired coverage and appearance is achieved.

  • Application

    Iso‐Tek® 8501 is best applied undiluted by a low pressure airless sprayer. A lambskin roller or brush can be used in smaller areas. The exact amount depends on the absorbency of the substrate. If the substrate is of high quality and hence not very absorbent, do not apply more than roughly 185 sq. ft. per gallon in one operation, as it may take several hours to penetrate completely. At higher application rates, the impregnating film might liquefy because of the concretes alkalinity and it might start to run off. Only impregnate concrete that has a uniformly dry surface with no damp patches. Should it suddenly start to rain, stop treatment and cover the impregnated areas.

    Application Notes:

    • Iso‐Tek® 8501 should not come into direct contact with bitumen. The resistance of insulant against Iso-Tek® 8501 has to be determined dependent on temperature.
    • Do not apply if rain is due on day of application
    • Do not apply in direct sunlight resulting in temperatures outside of the application parameters
    • Do not apply in high wind conditions (applies if utilizing airless sprayer and winds exceeding 35 mph)
    • Do not apply if temperature is expected to fall below 41 degrees F
  • Technical Specs

    • Feature: Water Repellent, Salt Repellent
    • Chemistry: Silane
    • Color: Clear
    • Finish: Invisible
    • Category: Penetrating
    • Carrier: Water
    • Availability: Ready to Use
    • Packaging: 5 Gallon
    • Coverage: 185 sq. ft.
    • Interior/Exterior: Interior/Exterior
    • Application Method: Airless sprayer, Roller
    • Application Temperature: 45 F - 90 F
    • Number of Coats: 1
    • Drying time : 24 Hours
    • Time before/after rain: 48 Hours
    • New Concrete: Yes, at least 28 days after being poured
    • Storage/Shelf Life: 1 Year
    • Clean up: Depolymizer
    • Paintable: Yes
    • VOC Content: 80 g/L