This one-part silicone sealant from Dow provides excellent adhesion to a range of non-porous surfa...This one-part silicone sealant from Dow provides excellent adhesion to a range of non-porous surfaces including aluminium, glass and painted surfaces. Fast curing, this sealant is tack-free within one hour and has a working time of 5 to 10 minutes. It is resistant to ageing, cracking and discolouring and is ideal for use in glazing, draughtproofing and general internal sealing applications. Listed by the UK Water Regulations Advisory Scheme for use in contact with potable water once cured. Conforms to ISO 11600-F&G-20LM. Application temperature range +5 to +40°C. Contents 310ml.
This guide is for anyone using Dowsil 781 Acetoxy Silicone Sealant. It helps you understand the product's features and how to use it effectively. The sealant provides excellent adhesion to many surfaces and offers flexibility for various applications, with the caveat that it is suitable for interior use only. This guide covers key features, real-world applications, setup, and troubleshooting to help you get the most out of your sealant.
All features
Colour
White
Model Part Number
3295036/C05
Brand
Dowsil
Extended Product Information
FAQs
What surfaces can I use Dowsil 781 on?
It adheres well to materials like aluminum, glass, painted surfaces, and many others. However, it's suitable for interior use only.
How long does it take for the sealant to become tack-free?
The sealant becomes tack-free in approximately 30 minutes.
What is the working time for this sealant?
The working time is between 5 and 10 minutes.
Can Dowsil 781 be used outdoors?
No, it is designed for interior use only.
What is the temperature range for application?
The application temperature range is +5 to +40 degrees Celsius.
How should I store the sealant?
Store in a cool, dry place, away from direct sunlight and extreme temperatures.
How much flexibility does the sealant provide?
It provides +/- 20% flexibility.
Is Dowsil 781 suitable for use in bathrooms and kitchens?
Yes, it is suitable for sealing joints in bathrooms and kitchens.
Troubleshooting
Sealant isn't adhering properly.
Ensure the surface is clean and dry. Use a suitable primer if necessary. Make sure to apply the sealant within the temperature range of +5 to +40 degrees Celsius.
Sealant is bubbling or not curing.
Ensure the application area has adequate ventilation. Check the expiration date of the sealant and store it properly. Apply the correct thickness for the joint.
Sealant has a strong odor after application.
Ensure the area is well-ventilated during and after application. The odor is typical and should dissipate as the sealant cures.
Pros and Cons
Pros
Strong adhesion to various materials like aluminum and glass.
Provides flexibility, accommodating movement in joints.
Quick tack-free time allows for faster project completion.
Easy to apply within the specified temperature range.
Offers 100% recovery for durable seals.
Cons
Suitable for interior use only.
Working time is limited to 5-10 minutes.
May not be suitable for all types of plastics or certain specialized surfaces.
Acetoxy silicone can have a distinct odor during application.
Requires proper surface preparation for optimal adhesion.
Setup, Compatibility & Care
Surface Preparation: Ensure surfaces are clean, dry, and free from dust, grease, and old sealant. Use a solvent if needed.
Application: Apply the sealant using a caulking gun, ensuring a consistent bead.
Tooling: Smooth the sealant with a wet finger or a smoothing tool within the working time (5-10 minutes).
Compatibility: Compatible with materials like aluminum, glass, and painted surfaces. Always test on a small, inconspicuous area first.
Care: Avoid contact with the sealant before it has fully cured. After curing, clean with mild soap and water.