Dowsil™ 791T Translucent Silicone Sealant is a high-performance, one-part neutral silicone sealant...Dowsil™ 791T Translucent Silicone Sealant is a high-performance, one-part neutral silicone sealant designed for weather sealing in both commercial and residential applications. It offers excellent adhesion to a variety of exterior surfaces and provides outstanding durability against harsh environmental conditions like ozone, UV radiation, and extreme temperature changes. The sealant has a working time of 20-30 minutes and becomes tack-free in 30 minutes. It conforms to ISO 11600-25LM and meets ISO specification 9047 class 50. Key features include remarkable flexibility allowing for ± 50% joint movement and applicability in temperatures ranging from -25 to +50°C. This translucent sealant comes in a 310ml cartridge, ideal for a durable and weather-resistant seal.
This guide is for anyone using the Dowsil™ 791T Translucent Silicone Sealant for weather sealing. The sealant provides excellent adhesion and durability against harsh environmental conditions, offering remarkable flexibility for joint movement. Keep in mind that while it works in a wide temperature range, it's best applied within the specified limits.
All features
Model Part Number
4028427/C05
Brand
Dowsil
Extended Product Information
FAQs
What is the working time of the sealant?
The working time is approximately 20-30 minutes.
How long does it take for the sealant to become tack-free?
It becomes tack-free in about 30 minutes.
What is the temperature range for application?
The application temperature range is -25 to +50°C.
Is the sealant suitable for outdoor use?
Yes, it is designed for weather sealing and is suitable for outdoor use.
Does it have good UV resistance?
Yes, it provides outstanding durability against UV radiation.
What kind of movement can it accommodate?
It allows for ± 50% joint movement.
What surfaces can it be applied to?
It offers excellent adhesion to a variety of exterior surfaces.
What is the shelf life of the sealant?
The shelf life is typically 12 months from the date of manufacture when stored properly.
Troubleshooting
Sealant isn't adhering properly.
Ensure the surface is clean, dry, and free of contaminants. Use a suitable primer if necessary.
Sealant is cracking after application.
Make sure the joint is within the sealant's movement capability (± 50%). Check the temperature conditions during application and curing.
Sealant isn't curing.
Ensure the application temperature is within the specified range (-25 to +50°C). Check the expiration date of the sealant.
Pros and Cons
Pros
Durable against harsh weather conditions.
Excellent adhesion to various surfaces.
Accommodates significant joint movement.
Quick tack-free time.
Wide temperature application range.
Cons
Limited working time of 20-30 minutes.
Specific temperature application range must be observed.
Requires proper surface preparation for optimal adhesion.
Setup, Compatibility & Care
Surface Preparation: Ensure the surfaces are clean, dry, and free of any contaminants like dust, oil, or existing sealants. Clean with a suitable solvent.
Application: Apply the sealant using a caulking gun. Cut the nozzle to the desired bead size.
Tooling: Tool the sealant within the working time (20-30 minutes) to ensure proper contact with the surfaces and a smooth finish.
Curing: Allow the sealant to cure completely according to the manufacturer's instructions before exposing it to weather or use.
Compatibility: This sealant is compatible with a wide range of materials. However, always test the sealant on a small, inconspicuous area to ensure compatibility before full application.
Storage: Store the sealant in a cool, dry place. The shelf life is typically 12 months from the date of manufacture when stored properly.