Preparation:

Clean all joints and glazing pockets, removing all foreign matter and contaminants such as grease, oil, dust, water, frost, surface dirt, old sealants, or glazing compounds and protective coatings.

 Application Method

• Install back-up material or joint filler, setting blocks, spacer shims, and tapes.
• Mask areas adjacent to joints to ensure neat sealant lines.
• Primer is generally not required on non-porous surfaces, but may be necessary for optimal sealing of certain porous surfaces. A test placement is always recommended.
• Apply DOWSIL 995 Silicone Structural Sealant in a continuous operation using a positive pressure. (The sealant can be applied using many types of air-operated guns and most types of bulk dispensing equipment.)
• Before a skin forms (typically within 10 minutes), tool the sealant with light pressure to spread the sealant against the backing material and joint surfaces.
• Remove masking tape as soon as the bead is tooled.

The rate of surface cure and cure-in- depth of most one-component RTV silicone sealants is affected by the temperature and humidity of the environment. However, an environment of high temperatures in combination with high humidity may slow the surface cure rate of DOWSIL 995 Silicone Structural Sealant.

DOWSIL 995 Silicone Structural Sealant should not be applied:

• To building materials that bleed oils, plasticizers, or solvents– materials such as impregnated wood, oil-based caulks, green or partially vulcanized rubber gaskets or tapes
• In totally confined spaces as the sealant requires atmospheric moisture for cure
• When surface temperatures exceed 60°C (140°F)
• Where painting of the sealant is required, as the paint film may crack and peel
• To surfaces in contact with food– this sealant does not comply with Federal Food and Drug Administration food-additive regulations
• In below-grade applications
• For use as an interior penetration fire stop sealing system
• In horizontal floor joints where abrasion and physical abuse are likely to be encountered
• To frost-laden or damp surfaces
• For continuous immersion in water

 This product is neither tested nor represented as suitable for medical or pharmaceutical uses. Dow shall not be held liable for any possible claims arising from structural glazing use of this product for projects that have not been specifically approved by Dow.