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Description
xDOWSIL 789 Silicone Weatherproofing Sealant is a one-part, neutral-cure, architectural grade sealant. It extrudes easily in any weather and cures at ambient temperature by reacting with moisture in the air to form a durable, flexible silicone rubber seal.
Product features
xProduct Key Features
- One-Part Neutral-Cure - Architectural-grade, one-part neutral-cure silicone sealant.
- Easy Extrusion - Easy to extrude in different weather conditions.
- Ambient Temperature Curing - Cures at ambient temperature using moisture in the air.
- Ready to Use - Supplied ready to use without additional mixing or preparation.
- Primerless Adhesion - Offers primerless adhesion to many common building components.
- Durable & Flexible Seal - Forms a durable and flexible silicone rubber seal.
Other Features
- Wide Temperature Range - Remains elastomeric from approximately -50°C to 150°C.
- Low Modulus - Low modulus formulation allows flexibility and movement accommodation.
- Movement Capability - Allows movement of approximately ±50% of the original joint width.
- Working Time - Typical working time is around 15–30 minutes.
- Curing Time - General curing time is approximately 7–14 days.
- Weather Sealing - Designed for long-term weather sealing and exterior durability.
Application areas
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Building panel joints.
Window perimeter joints.
Facade weather sealing.
Curtain wall glazing.
How to use
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Prepare the Joint Surface - Clean the glazing, façade, or building joint thoroughly. The surfaces should be dry and free from dirt, dust, grease, loose material, and old sealant.
Mask the Joint Edges - Apply masking tape along the edges to maintain a clean and uniform sealant line.
Prepare the Cartridge and Nozzle - Cut the cartridge opening, trim the nozzle to the required joint width, attach it securely, and place the cartridge into the sealant gun.
Apply DOWSIL™ 789 - Extrude the sealant evenly and continuously into the joint, making sure there are no gaps or air pockets.
Tool the Sealant - Smooth the sealant immediately to achieve proper contact with the joint surfaces and a clean profile.
Complete and Allow to Cure - Remove masking tape and excess sealant after tooling. The typical working time is 15–30 minutes, while complete curing generally takes 7–14 days, depending on conditions.
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