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DOWSIL 791 Silicone Weatherproofing Sealant

Neutral silicone sealant for weatherproofing joints and glazing.

DOWSIL 791 Silicone Weatherproofing Sealant is a one-part, neutral curing silicone sealant designed for effective weatherproofing of expansion and movement joints. With excellent adhesion properties, it is suitable for various applications in curtain walls and building facades, ensuring durable performance across temperature extremes and environmental conditions.
This low odor sealant offers ease of application while conforming to international standards, making it an ideal choice for construction professionals.

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Technical Details

DOWSIL 791 Silicone Weatherproofing Sealant is versatile and can be utilized in a variety of applications, including:
• Weather sealing for expansion joints
• Connection joints in building facades
• Perimeter joints around windows and doors
• Glazing applications in curtain walls
• Movement joints in construction projects
DOWSIL 791 Silicone Weatherproofing Sealant offers numerous advantages that enhance its performance and usability in construction applications. This product is designed to meet various requirements while ensuring durability and reliability in sealing joints and facades.
• Neutral cure formulation ensures minimal odor during application
• Excellent adhesion to a wide range of substrates
• High resistance to ozone, ultraviolet radiation, and temperature extremes
• Capable of accommodating joint movement up to ± 50%
• Conforms to international standards such as ISO 11600-F&G-25LM
• Low modulus design facilitates easy application and tooling
• Suitable for both interior and exterior applications
DOWSIL 791 Silicone Weatherproofing Sealant offers a range of technical properties that define its performance and application suitability:
Test Property Unit Result
Cure system Alkoxy
Application temperature °C +5 to +40
Specific gravity 1.50
Extrusion rate g/minute 220
Skin-over time (23°C, 50% R.H.) minutes 20
Tack-free time (23°C, 50% R.H.) minutes 30
Cure rate (23°C, 50% R.H.) 1 day 2.0 mm
3 days 4.0 mm
Modulus 100% (2 mm thickness S2 dumb-bells) MPa 0.45
Tensile strength MPa 1.9
Elongation at break % 700
Modulus 100% (12x12x50 mm size T.A. joint) MPa 0.35
Tensile strength MPa 0.75
Elongation at break % 380
Hardness (Shore A) 29
Elastic recovery % > 90
Joint movement capability % ± 50
DOWSIL 791 Silicone Weatherproofing Sealant is designed for a variety of applications that require effective sealing and weatherproofing:
General Glazing:
DOWSIL 791 is particularly suitable for general glazing tasks, providing strong adhesion for glass and framing elements in building facades.
Weather Sealing:
It is ideal for weather sealing expansion joints, connection joints, and perimeter joints around windows and doors, ensuring protection against environmental conditions.
Movable Joints:
The sealant accommodates movement, making it perfect for use in movement joints in construction projects where flexibility is required to handle structural shifts.
Facade Applications:
DOWSIL 791 is extensively utilized in curtain wall systems and building facades, contributing to overall building durability and efficiency.
Temperature Resistance:
Its resistance to temperature extremes ensures reliable performance in a wide range of climates and conditions, enhancing longevity and reducing maintenance needs.
DOWSIL 791 Silicone Weatherproofing Sealant is available in convenient packaging options:
• 310 ml cartridges
• 600 ml sausages

For warranty information regarding the DOWSIL 791 Silicone Weatherproofing Sealant, please contact our team at SMCC. Our representatives are available to assist you with any inquiries you may have. You can reach us using the contact methods provided on this page.

Product FAQ

Yes, DOWSIL 791 is suitable for exterior applications.
DOWSIL 791 can effectively seal expansion joints, connection joints, perimeter joints, and movement joints in construction projects, providing reliable performance in glazing and weather sealing applications.
Yes, DOWSIL 791 is resistant to ozone, ultraviolet radiation, and extreme temperatures, making it suitable for harsh weather conditions.
The ideal application temperature for DOWSIL 791 is between +5°C and +40°C.
The maximum joint movement capability is ± 50%.
The cure time for DOWSIL 791 is approximately 2 mm in 1 day and 4 mm in 3 days at 23°C and 50% relative humidity.

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For further inquiries about DOWSIL 791 Silicone Weatherproofing Sealant, please reach out to our expert team at SMCC. We are committed to supporting construction and contracting professionals with tailored solutions, product specifications, and application guidance to ensure successful project outcomes. Your satisfaction is our priority.

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DOWSIL 791 Silicone Weatherproofing Sealant