Use DOWSIL™ 791 Silicone Weatherproofing Sealant for: Weatherproofing and glazing applications in curtain walls, building facades, and other areas requiring a durable, weather-resistant sealant.
DOWSIL™ 791 Silicone Weatherproofing Sealant is a one-part, neutral-curing, low-modulus silicone sealant that provides exceptional performance in demanding weather conditions. It is ideal for various applications, including expansion joints, connection joints, perimeter joints, and other movement joints in curtain walls, building facades, and other structures. The sealant offers excellent resistance to ozone, UV radiation, and temperature extremes, ensuring long-lasting protection against the elements. With its low odour and neutral cure formulation, DOWSIL™ 791 Silicone Weatherproofing Sealant is easy to apply and provides a durable, weather-resistant seal.
Key Features of DOWSIL™ 791 Silicone Weatherproofing Sealant
- Neutral cure
- Low odour
- Resistant to ozone, UV radiation, and temperature extremes
- Joint movement capability ± 50%
- Conforms to ISO 11600-F&G-25LM
Technical Overview
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Chemical Properties: Neutral silicone sealant
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Application Temperature Range: +5°C to +40°C
Trade Professional Information
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Required Tools: Sealant gun, backing rod (if necessary), masking tape, cleaning cloths, DOWSIL™ R-40 Universal Cleaner (for cleaning surfaces).
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Trade-Specific Tips: Ensure surfaces are clean, dry, and free of contaminants before application. Use masking tape to protect adjacent surfaces and ensure a neat sealant line. Use backer rod to control sealant depth and prevent three-sided adhesion. Tool the sealant within 5 minutes of application for a smooth, professional finish.
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Common Issues and Solutions: Avoid using on substrates that might bleed oils, plasticizers, or solvents. Do not use in a totally confined space, as the sealant requires atmospheric moisture to cure. For porous substrates, bleeding may occur; conduct specific testing on sensitive substrates.
Storage and Shelf Life
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Storage Requirements: Store in a cool, dry place.
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Shelf Life Information: 12 months from the date of production when stored at or below 30°C in original, unopened containers.
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Temperature Considerations: Avoid storing in extreme temperatures to maintain product integrity.
Certifications
- ISO 11600-F&G-25LM
- SNJF (F&G – 25E)
- DIN 18540 Class F
- EN 15651 - CE MARK
- EMICODE EC1 Plus
