• Description for Dow 888 Silicone Joint Sealant

    All temperature gunnability; seals irregular surfaces; unprimed adhesion; low modulus; good weatherability; fast cure.

    *See Terms of Use Below

    Application Type Bond, Repair, Seal
    1 Part or 2 Part 1 Part
    Material Form Paste
    Substrate Portland cement concrete (PCC), Concrete, Portland cement concrete (PCC)
    Manufacturer Dow
    Chemistry Silicone
    Cure Method Moisture
    Cure Temperature (°C) 25, 25
    Cure Time (min) Fast, 10,080 to 20,160, >10,080
    Color Gray
    Key Specifications 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

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  • Best Practices

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  • Comparable Materials

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
25°C As Cured – after 7 days at 25°C (77°F) and 50 percent RH
Cure Time Test Methods
Cure Time Test Method
10,080 to 20,160 min
>10,080 min As Cured – after 7 days at 25°C (77°F) and 50 percent RH
Tack Free Time Test Methods
Tack Free Time Tack Free Temperature
60 min 25°C
Work / Pot Time Test Methods
Work / Pot Time Temperature
0.17 min 25°C
Elongation Test Methods
Elongation Test Method
12 % after 7 days at 25°C (77°F) and 50 percent RH
Modulus Test Methods
Modulus Test Method
Low Modulus Test Method
45 psi at 150 percent elongation, maximum, after 7 days at 25°C (77°F) and 50 percent RH
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
15 to 25 after 7 days at 25°C (77°F) and 50 percent RH 25°C