Dow Corning 799 - Clear
Low Modulus Silicone Weatherproofing Sealant for Glazing & Cladding
Dow Corning 799 Clear is a high-performance, one-part, low modulus neutral cure silicone sealant developed for weathersealing curtain walling, building facades, and glazing systems. It cures at room temperature to form a flexible, long-lasting seal that is highly resistant to weathering, UV radiation, and moisture.
Key Features & Benefits
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Low Modulus Flexibility: Excellent movement capability for dynamic joints and façade elements.
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Neutral Cure: Non-corrosive formulation safe for sensitive substrates including metals and natural stone.
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Crystal Clear Finish: Provides an invisible joint for discreet, clean applications.
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Durable Weather Resistance: Resists UV, rain, and temperature extremes for long-term performance.
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Excellent Adhesion: Bonds well to glass, aluminium, PVC, and other common construction materials.
Product Details
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Type: Low modulus neutral cure silicone
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Colour: Clear
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Packaging: 310ml cartridge
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Skin Time: Approx. 10–20 minutes
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Curing Rate: 2–3mm per 24 hours
Application Instructions
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Preparation: Ensure substrates are clean, dry, and free of dust or grease. Mask areas if necessary.
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Apply Sealant: Cut nozzle to desired width and apply a continuous bead using a caulking gun.
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Tooling: Smooth the joint with a suitable tool within the skin time to ensure full contact.
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Finish: Remove masking tape immediately after tooling. Allow to cure undisturbed.
Limitations
- Not recommended for structural glazing or underwater joints.
- Not suitable for surfaces contaminated with oils or solvents.
Health & Safety
Use in a well-ventilated area. Avoid contact with skin and eyes. Wear gloves and safety glasses during application. Refer to the Safety Data Sheet (SDS) for full safety details.