• Description for Dow 999-A Silicone Building & Glazing Sealant

    Long life, wide service temperature range; resists sunlight, moisture and ultraviolet radiation.

    *See Terms of Use Below

    Application Type Seal
    1 Part or 2 Part 1 Part
    Material Form Paste
    Substrate Glass, Metal, Plastic
    Manufacturer Dow
    Chemistry Silicone
    Cure Method Moisture
    Cure Temperature (°C) 25
    Cure Time (min) 10,080
    Ozone Resistance Ozone resistance
    Chemical Resistance Sleet, Snow
    High Temperature Resistance (°C) 177
    Low Temperature Resistance (°C) -60
    Other Resistance Sunlight
    Key Specifications ASTM (American Standard Test Method): C 920: Meets the qualifications of ASTM C 920 Specification, Class 25, FDA (U.S. Food & Drug Administration) and/or CFIA (Canadian Food Inspection Agency): Meets the qualifications of FDA 21 CFR 177.2600 (check colors for compliance)
  • Technical Data

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
25°C As Cured – 7 days at 25°C (77°F) and 50% RH
Cure Time Test Methods
Cure Time Test Method
10,080 min As Cured – 7 days at 25°C (77°F) and 50% RH
Tack Free Time Test Methods
Tack Free Time Test Method
10 to 20 min ASTM C 679
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature Cure Humidity Test Method
325 psi 10,080 min 25°C 50 % Ultimate, ASTM D 412
Peel Strength Test Methods
Peel Strength Cure Time Cure Temperature Cure Humidity Test Method
20 (pli) 10,080 min 25°C 50 % ASTM C 794
Tear Strength Test Methods
Tear Strength Cure Time Cure Temperature Cure Humidity Test Method
25 (ppi) 10,080 min 25°C 50 % ASTM D 624, As Cured – 7 days at 25°C (77°F) and 50% RH
4.4 (kN/m)
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
25 ASTM D 2240, 7 days at 25°C (77°F) and 50% RH 25°C