Dowsil 784 Glazing Silicone Sealant - 310ml Cartridge
Dowsil 784 Glazing Silicone Sealant - 310ml Cartridge
Overview
Dowsil 784 Glazing Silicone Sealant is a one-part silicone sealant, specifically designed for glazing single glass panes where resistance to mildew is essential. Its fungicide formula provides excellent protection against mould, making it ideal for use in areas with high humidity, such as bathrooms and kitchens. Offering good adhesion to various non-porous surfaces, such as glass and aluminium. It is perfect for weather sealing in moisture-prone environments, ensuring long-lasting durability and a clean appearance without mould growth.
- Ideal for space subject to high humidity
- Fungus & mildew resistant
- Adheres to Aluminum, Glass & Wood
- Fast cure - tack-free in 1 hour
- Resist to ozone, ultra-violet radiation and temperature extremes
- Good elasticity
- Conforms to ISO 11600-G-20LM
| Area | Interior & Exterior |
| Recommended Use | Use as a weather-sealant in areas that may be subject to high humidity, where mould growth can occur, such as such as windows, bathrooms and kitchens. |
| Drying Time | Curing Time: 24 hours |
| Application Method | Skeleton Gun |
| Clean Up | Remove as much product as possible from the equipment before cleaning following manufacturer's recommendations |
Preparation
Before applying the sealant, verify that the surfaces to be sealed are clean, dry, and sound. Ensure they are free from frost, release agents, old sealants, and other contaminants that could impair adhesion.
- All surfaces should be cleaned and degreased. Wipe the surfaces with a suitable solvent like DOWSIL™ R-40 Universal Cleaner on a clean, oil- and lint-free cloth to remove any dirt, grease, or residues.
- Mask areas adjacent to the joints with tape to prevent contamination of the substrates and to ensure a neat sealant line.
- Allow the surfaces to dry thoroughly before applying the sealant.
- DOWSIL™ 781 Acetoxy Sealant offers good adhesion to most non-porous substrates found in glazing applications. However, due to the variety of coatings available, we recommend that the substrates be tested for adhesion prior to use.
- The use of a primer will help maximize adhesion, especially where cleaning is a concern (e.g., mill-finished aluminum).
Application
The silicone sealant is ready for immediate use. Cut the tip off the cartridge and screw on the nozzle and cut the nozzle to the desired bead size. We recommend using the Geocel Cox Skeleton Gun for application.
If back-up material is needed, it is recommended to use closed cell polyethylene backer rod. This will help provide back pressure and ensure proper sealant movement.- When back-up material is required, closed-cell polyethylene backer rod is recommended. For joints too shallow to allow the use of a backer rod, low-tack polyethylene tape should be applied. These back-up materials provide necessary back pressure and prevent three-sided adhesion, which can restrict the movement capability of the sealant.
- Apply the sealant in a continuous bead using an appropriate gun or dispensing tool. Ensure that the sealant fully covers the joint and adheres to both surfaces.
- Tool the sealant within 5 minutes of application to ensure good contact between the sealant and the substrate. Tooling also helps to create a smooth, professional finish for best results we recommend using Bedec Silicone Profilers.
- Ensure the joint width is properly designed to accommodate the sealant's movement capability
- For joints 6-12 mm wide, the seal depth should be 6 mm.
- For joints larger than 12 mm wide, use a 2:1 width-to-depth ratio.
- In situations requiring fillet joints, ensure a minimum of 6 mm sealant bite to each substrate.
- Once the sealant is applied and tooled, allow it to cure according to the product's instructions. Clean excess sealant from tools and non-porous surfaces with DOWSIL™ R-40 Universal Cleaner while the sealant is still uncured.
Always follow manufacturers instructions found on the packaging.