Features & Benefits
• Good unprimed adhesion to a variety of substrates
• Low modulus, high elasticity
• 100% silicone sealant
• Neutral cure
• Low odor
• Conforms to ISO 11600-F&G-25LM
• Resistant to ozone, ultra-violet radiation and temperature extremes
Applications
DOWSIL™ 796 Neutral Silicone is a one-part, low modulus, neutral curing silicone sealant specifically developed for the sealing of PVC-U, glass, glazed surfaces and brickwork. It is very popular for perimeter sealing applications of windows and doors.
Usable Life and Storage
When stored at or below 30°C (86°F) in the original unopened containers, DOWSIL™ 796 Neutral Silicone has a usable life of 12 months from the date of production.
How to Use
Surface Preparation
Ensure that surfaces to be sealed are clean, dry, sound and free from frost. Clean all joints of release agents, water repellents, laitance, dust, dirt, old sealants and other contaminants which could impair adhesion. Non-porous surfaces should be cleaned and degreased by wiping with a suitable solvent such as DOWSIL™ R-40 Universal Cleaner on an oil and lint-free cloth before application of sealant. Porous substrates should be mechanically cleaned using a steel brush, sanding disc or any similar means.
Note: When using any solvent, always provide adequate ventilation. Avoid heat, sparks and open flames. Use solvent resistant gloves. Observe and follow all precautions listed on solvent container label.
Masking
Areas adjacent to the joints should be masked with tape to prevent contamination of the substrates and to ensure a neat sealant line. Masking tape should be removed immediately after tooling.
Priming
No primer is required for PVC-U and for most common construction substrates including brick. However, a test placement prior to general use is always recommended.
Back-up Materials
Closed cell polyethylene backer rod is recommended as a back-up material to provide back pressure and avoid three sided adhesion that limits sealant movement capability. Low tack polyethylene tape should be used in joints too shallow to allow the use of backer rod.
Finishing
The joint should be tooled within 5 minutes of application to ensure good contact between the sealant and the substrate. Tooling of the sealant also gives a smooth, professional finish.
Clean-up
Excess sealant may be cleaned off tools and non-porous surfaces whilst in an uncured state using DOWSIL™ R-40 Universal Cleaner. If sealant is misapplied to porous substrates, it should be left until it is just cured and then removed by peeling, cutting or other mechanical means. Care should be taken not to damage plastic or coated surfaces.
