PRODUCT DESCRIPTION
DOWSIL™ 791T Weatherproofing Sealant Transparent is a one-part, neutral curing silicone sealant designed for weatherproofing and sealing of expansion and connection joints in construction and façade applications. It provides durable adhesion to a wide range of construction substrates including glass, metals, concrete, masonry, brick and plastics.
Application type: Weatherproofing silicone sealant for façade and expansion joints
Manufacturer: DOW
KEY FEATURES
- One-part neutral curing silicone sealant
- Movement capability up to ±50%
- Excellent adhesion to porous and non-porous substrates
- Resistant to UV radiation, ozone and weathering
- Maintains elasticity under expansion and compression
- Suitable for manual application
- Compatible with butyl and conventional tooling systems
- Service temperature: -50°C to +150°C
DESIGNED FOR
- Expansion joints in curtain wall façades
- Connection joints in building envelopes
- Sealing joints between floors and walls
- Weatherproofing of façade systems
- General construction joint sealing
TECHNICAL DATA
- Cure system: Neutral
- Density: ~1.03 g/ml
- Skin-over time: ~10–15 min
- Tack-free time: ~15–50 min
- Extrusion rate: ~100 g/min
- Movement capability: ±50%
- Shore A hardness: ~15
- Tensile strength: ~1.3 MPa
- Elongation at break: ~575%
- Service temperature: -50°C to +150°C
STANDARDS AND COMPLIANCE
- ISO 11600 – F&G-25LM
- SNJF (F&G – 25E)
- ISO 846 (mould resistance)
APPLICATION NOTES
- Surfaces must be clean, dry and free from contaminants
- Do not apply below +5°C
- Primer required for porous substrates
- Use backing rod (closed cell polyethylene) where required
- Tool within 5–10 minutes after application
LIMITATIONS
- Not suitable for substrates that bleed oils, plasticizers or solvents
- Not recommended for use on bituminous materials
- Compatibility testing recommended for specific applications
- Not tested for medical or pharmaceutical use
STORAGE AND SHELF LIFE
- Shelf life: 12 months
- Storage: ≤30°C in original unopened containers
PACKAGING
- 310 ml cartridges (boxes of 12)
SAFETY
Refer to Safety Data Sheet (SDS) before use
📄 Technical documentation
Download the product TDS / PDF for detailed technical information.
📩 Inquiry
For pricing, product availability, technical documentation and B2B supply options in your market, please contact us.