Dow 890-SL Self Leveling Joint Sealant

Dow 890-SL Self Leveling Joint Sealant Datasheet
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  • Description for Dow 890-SL Self Leveling Joint Sealant

    All temperature gunnability; seals irregular surfaces without tooling; unprimed adhesion; ultra-low modulus; good weatherability; short cure time.

    *See Terms of Use Below

    Application Type Bond, Repair, Sealant
    1 Part or 2 Part 1 Part
    Material Form Liquid
    Substrate Portland cement concrete
    Manufacturer Dow
    Chemistry Silicone
    Cure Method Moisture
    Cure Temperature (°C) 25, 25
    Cure Time (min) Short
    Viscosity (cPs) Self-leveling
    Color Dark gray
    Key Specifications ASTM (American Standard Test Method): ASTM D 5893-96

  • Technical Data for Dow 890-SL Self Leveling Joint Sealant

    *See Terms of Use Below

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Liquid
    • Substrate
      • Concrete - Portland cement concrete
      • Other - Asphalt, Irregular surfaces
    • Industry
    • Chemistry
    • Application Method
      • Dispenser - An air-powered pump
      • Brush - Hand
    • Cure Method
      • Moisture / Condensation Cure - Moisture
    • Color
      • Gray - Dark gray
    • Key Specifications
      • ASTM (American Standard Test Method): D 5893-96 - ASTM D 5893-96
    Specifications
    Cure Specs
    Cure Temperature (°C) 25, 25 Test Method
    Cure Time (min) Short Test Method
    Viscosity (cPs) Self-leveling
    Material Resistance
    Environmental Resistance Good weatherability
    Hardness
    Elongation (%) 14 Test Method
    Flexibility Flexible, Resilient
    Modulus (psi) Ultra-low, 7, 8, 9 Test Method
    Other Properties
    Specific Gravity 1.260 to 1.340
    Flash Point (°F) 212.0
    % Solids (%) 96
    Business Information
    Shelf Life Details When stored in original, unopened containers at or below 32°C (90°F), Dow Corning 890-SL Self-Leveling Silicone Joint Sealant has a shelf life of 12 months from date of manufacture. Refer to product packaging for “Use By” date. Keep containers tightly closed.
    Shelf Life Type From date of manufacture
    Shelf Life (mon) 12
    Not Good For
    Don't Use For concrete pavements
    Don't Use With wet or damp asphalt

  • Best Practices for Dow 890-SL Self Leveling Joint Sealant

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    1. Surface Preparation

      the surface must be clean, dry and frost-free

    2. Application

      Dow Corning 890-SL Self-Leveling Silicone Joint Sealant is an easy-to-use, to-use, self-leveling sealant that does not require a separate tooling step as conventional, non-sag sealants do. Because the sealant is self-leveling, it cannot be used on vertical surfaces. Before attempting to seal joints in new asphalt, the asphalt must be given sufficient time to cool and to “cure,” so that damage will not result from sawing. This time will depend upon a number of factors, such as mix design, time of year for placement, geographic location and past experiences. The asphalt must also be completely dry prior to sealant installation. In new construction where the joint is a new cut, a shallow cut may be used where the backer rod is placed on the bottom of the joint. (See Figure 1.) A shallow cut saves time and saw blades. In repair or remedial work where previous sealant materials have failed, care should be taken to completely remove the failed sealant from the joint faces. A standard joint design is recommended in which the backer rod is slightly above the shelf. Extra space should be provided to allow for possible “pumping” of old failed joint sealant that may have fallen below the joint. When Dow Corning 890-SL Self-Leveling Silicone Joint Sealant is used for sealing reflection cracks in asphalt pavements, additional joint preparation steps must be used. Cracks that have formed in the asphalt pavement must be totally removed by saw cutting along both sides of the crack, exposing freshly cut and sound asphalt joint faces. When Dow Corning 890-SL Self-Leveling Silicone Joint Sealant is used to seal asphalt-to-concrete shoulder joints, care must be taken to ensure that the asphalt is completely removed from the concrete face to which the sealant will be bonding. This can be accomplished by saw cutting tightly along the concrete. A fresh and sound joint face must also be prepared in the asphalt by saw cutting. Dow Corning 890-SL Self-Leveling Silicone Joint Sealant is part of a system that must include the proper backer rod and proper installation procedures. Please refer to Dow Corning’s Installation Guide for Silicone Pavement Sealants (Form No. 61-507) for more information on applications, preparation and installation

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
25°C
25°C As Cured – after 21 days at 25°C (77°F) and 50 percent RH
Cure Time Test Methods
Cure Time Test Method
Short
Work / Pot Time Test Methods
Work / Pot Time Temperature
Elongation Test Methods
Elongation Test Method
14 % after 21 days at 25°C (77°F) and 50 percent RH
Modulus Test Methods
Modulus Test Method
Ultra-low
7 psi joint modulus, at 50 percent Elongation, maximum, after 21 days at 25°C (77°F) and 50 percent RH
8 psi joint modulus, at 100 percent Elongation, maximum, after 21 days at 25°C (77°F) and 50 percent RH
9 psi joint modulus, at 150 percent Elongation, maximum, after 21 days at 25°C (77°F) and 50 percent RH