Dow 888 Silicone Joint Sealant Datasheet Dow 888 Silicone Joint Sealant

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  • Description for Dow 888 Silicone Joint Sealant

    One-part, non-sag silicone material that cures to a low-modulus silicone rubber upon exposure to atmospheric moisture. Can be applied over a wide temperature range.

    *See Terms of Use Below

    Chemical Resistance Fuel resistant short-term exposure.
    Application Type Bond, Repair, Sealant
    1 Part or 2 Part 1-Part
    Material Form Paste
    Substrate Concrete, Silicone rubber, Portland cement concrete (PCC)
    Industry May be used in joints that are not uniform in width., Joint sealant, May also be used in joints with minor spalling., Joint sealant can be used for concrete to concrete pavement joints
    Manufacturer Dow
    Chemistry Silicone
    Cure Method Moisture, Room temperature cure
    Cure Temperature (°C) 23, 25
    Cure Time (min) 30,240, 30,240
    Viscosity (cPs) Non-sag
    Color Gray
    High Temperature Resistance (°C) 49
    Low Temperature Resistance (°C) -29
    Extrusion Rate (g/sec) 72 (mL/min)
    Key Specifications ASTM D 5893 Type NS, TT (U.S. Federal Specification): S-001543A: Meets and exceeds TT-S-001543A Class A(one-part silicone sealants); TT-S-00230C Class A (one-component sealants)

  • Technical Data for Dow 888 Silicone Joint Sealant

    *See Terms of Use Below

    Overview
    • Chemical Resistance
      • Chemical Resistance - Fuel resistant short-term exposure.
    • Application Type
    • 1 Part or 2 Part
      • 1-Part
    • Material Form
      • Paste
    • Substrate
      • Concrete - Portland cement concrete (PCC)
      • Silicone Rubber
      • Other - Irregular surfaces
    • Industry
      • Other Transportation - Airport
      • Industrial - Bridge joints
      • Joints - May be used in joints that are not uniform in width., May also be used in joints with minor spalling., Joint sealant can be used for concrete to concrete pavement joints, Joint sealant
      • Construction - For use in new construction applications., Highway
      • Other - For use in repair applications, For use in remedial applications
    • Chemistry
    • Application Method
      • Dispenser - Air-powered pump
    • Cure Method
      • Room Temperature / Air Dry - Room temperature cure
      • Moisture / Condensation Cure - Moisture
    • Color
      • Gray
    • Key Specifications
      • ASTM (American Standard Test Method) - ASTM D 5893 Type NS
      • TT (U.S. Federal Specification) : S-001543A : Class A - Meets and exceeds TT-S-001543A Class A(one-part silicone sealants); TT-S-00230C Class A (one-component sealants)
    Specifications
    Cure Specs
    Cure Temperature (°C) 23, 25 Test Method
    Cure Time (min) 30,240, 30,240 Test Method
    Viscosity (cPs) Non-sag
    Tack Free Time (min) <300 Test Method
    Bond Strength
    Tensile Strength (psi) 28 Test Method
    Material Resistance
    UV Resistance UV resistant
    Environmental Resistance Weather resistant
    High Temperature Resistance (°C) 49
    Low Temperature Resistance (°C) -29
    Hardness
    Shore A Hardness 15 Test Method
    Elongation (%) >1,000 Test Method
    Flexibility Flexible
    Modulus (psi) Low
    Other Properties
    Extrusion Rate (g/sec) 72 (mL/min)
    Specific Gravity 1.480 Test Method
    Business Information
    Shelf Life Details When stored in original, unopened containers between 0°C (32°F) and 32°C (90°F), Dow Corning 888 Silicone Joint Sealant has a shelf life of 12 months from date of manufacture.Keep containers tightly closed. Refer to product packaging for “Use By Date.”
    Shelf Life Type From date of manufacture
    Shelf Life (mon) 12

  • Best Practices for Dow 888 Silicone Joint Sealant

    *See Terms of Use Below

    1. Surface Preparation

      For optimum adhesion, the surface must be clean, dry and frost-free.

    2. Application

      Cold applied, ready-to-use as supplied

      dispensed directly from the bulk container into the joint by hand or with an air-powered pump.

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    *See Terms of Use Below

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
23°C As Supplied, 50% R.H, D 5893 Requirement, These values are not intended for use in preparing specification
25°C 50% RH., These values are not intended for use in preparing specifications., As Supplied
Cure Time Test Methods
Cure Time Test Method
30,240 min As Supplied, 50% R.H, D 5893 Requirement, These values are not intended for use in preparing specification
30,240 min 50% RH., These values are not intended for use in preparing specifications., As Supplied
Tack Free Time Test Methods
Tack Free Time Test Method
<300 min ASTM C 679, Pass, As Supplied, D 5893 Requirement. These values are not intended for use in preparing specifications.
Tensile Strength Test Methods
Tensile Strength Test Method
28 psi ASTM D 412 (Die C), Tensile Stress @ 150%, 45 psi max, D 5893 Requirement, These values are not intended for use in preparing specification
Elongation Test Methods
Elongation Test Method
>1,000 % As Cured – 21 days at 25°C (77°F) and 50% RH, ASTM D 412 (Die C), Ultimate Elongation 600% min, D 5893 Requirement, these values are not intended for use in preparing specification
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method
15 As Supplied, ASTM C 661, Durometer Shore A-2, These values are not intended for use in preparing specifications, 25 maximum, D 5893 Requirement
Specific Gravity Test Methods
Specific Gravity Test Method
1.480 ASTM C 792, As Supplied, these values are not intended for use in preparing specifications