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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.Application Type Seal, Bond 1 Part or 2 Part 1 Part Material Form Paste Substrate Anodized coated aluminum, Copper, Non-porous, Porous, Coated glass, Galvanized steel, Mortar, 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 (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, ASTM C- 920 Type S, Grade NS, Class 50, Use NT, M, G, A; Meets the requirements of ISO 11600 F&G-25LM
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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 |

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