Dow 791 Silicone WeatherpRoofing Sealant

Dow 791 Silicone WeatherpRoofing Sealant Datasheet
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  • Description for Dow 791 Silicone WeatherpRoofing Sealant

    Excellent weatherability, unprimed adhesion, rheology, low string upon gunning; meets global standards; compatible with all Dow Corning sealants.

    *See Terms of Use Below

    Application Type Bond, Seal
    1 Part or 2 Part 1 Part
    Material Form Paste
    Substrate Anodized coated aluminum, Copper, Coated glass, Mortar, Porous, Non-porous, Steel: Galvanized steel, Glass
    Manufacturer Dow Corning
    Chemistry Silicone
    Cure Method Moisture
    Cure Temperature (°C) 23, 23, 23
    Cure Time (min) 10,080 to 20,160, >10,080, >40,320
    Color Black, Gray, Limestone, Precast white, Bronze, Limestone, White
    High Temperature Resistance (°C) 150, 50
    Low Temperature Resistance (°C) -25, -50
    Key Specifications ASTM C- 920 Type S, Grade NS, Class 50, Use NT, M, G, A; Meets the requirements of ISO 11600 F&G-25LM, ASTM (American Standard Test Method): C 920: ASTM C- 920 Type S, Grade NS, Class 50, Use NT, M, G, A; Meets the requirements of ISO 11600 F&G-25LM

  • Technical Data

    Overview
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    Specifications
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  • Best Practices

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
23°C At 50% RH and 23°C 73°F
23°C As Cured – After 7 days at 50% RH and 23°C (73°F)
23°C As Cured – After 28 days at 50% RH and 23°C (73°F) – 12 x 12 x 50 mm T.A. joint
Cure Time Test Methods
Cure Time Test Method
10,080 to 20,160 min At 50% RH and 23°C 73°F
>10,080 min As Cured – After 7 days at 50% RH and 23°C (73°F)
>40,320 min As Cured – After 28 days at 50% RH and 23°C (73°F) – 12 x 12 x 50 mm T.A. joint
Tack Free Time Test Methods
Tack Free Time Tack Free Temperature Test Method
35 min 23°C ASTM C 679, At 50% RH and 23°C 73°F
Work / Pot Time Test Methods
Work / Pot Time Test Method Temperature
15 min CTM 98B, At 50% RH and 23°C 73°F 23°C
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature Cure Humidity Test Method
120 psi >40,320 min 23°C 50 % After 28 days at 50% RH and 23°C (73°F) – 12 x 12 x 50 mm T.A. joint (ISO 8339) [0.5 x 0.5 x 2 inch T.A. joint (ASTM C 1135)]
Elongation Test Methods
Elongation Test Method
460 % After 28 days at 50% RH and 23°C (73°F) – 12 x 12 x 50 mm T.A. joint (ISO 8339) [0.5 x 0.5 x 2 inch T.A. joint (ASTM C 1135), Ultimate elongation at break
Modulus Test Methods
Modulus Test Method
Low Modulus Test Method
Medium Modulus Test Method
70 psi at 100% Elongation, After 28 days at 50% RH and 23°C (73°F) – 12 x 12 x 50 mm T.A. joint (ISO 8339) [0.5 x 0.5 x 2 inch T.A. joint (ASTM C 1135)
40 psi at 25% Elongation, After 28 days at 50% RH and 23°C (73°F) – 12 x 12 x 50 mm T.A. joint (ISO 8339) [0.5 x 0.5 x 2 inch T.A. joint (ASTM C 1135)]
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
30 ASTM D 2240, After 7 days at 50% RH and 23°C (73°F) 23°C
Specific Gravity Test Methods
Specific Gravity Temperature Test Method
1.520 23°C CTM 97B