Features Of Dow DOWSIL 7091 Silicone Adhesive Sealant
High-performance, one-component, moisture-curing silicone adhesive sealant with excellent adhesion to glass, aluminum, and painted metal substrates.
Offers superior resistance to UV radiation, ozone, and extreme temperatures ranging from –40 °C to +150 °C.
Low modulus formulation provides exceptional flexibility and stress relief for bonded assemblies subject to thermal cycling or vibration.
Non-corrosive, acetoxy-cure chemistry ensures compatibility with sensitive electronic components and architectural metals.
Meets ASTM C920 Type S, Grade NS, Class 25, T, NT performance requirements for structural glazing sealants.
Typical Applications Of Dow DOWSIL 7091 Silicone Adhesive Sealant
Structural glazing in commercial curtain wall systems.
Bonding and sealing of insulating glass (IG) units.
Adhesive bonding of aluminum composite panels (ACP) and metal façade elements.
Sealing and mounting of photovoltaic module frames and solar racking components.
Interior and exterior architectural bonding where high durability and weather resistance are required.
Specifications Of Dow DOWSIL 7091 Silicone Adhesive Sealant
| Chemical Type | Acetoxy-cure silicone polymer |
| Product Form | Thixotropic paste, ready-to-use |
| Appearance | Opaque white or translucent gray (color options available) |
| Primary Applications | Structural glazing, IG unit assembly, architectural metal bonding |
| Key Features | UV stable, non-corrosive, low modulus, moisture-curing |
| Shore A Hardness (7 days, 23°C/50% RH) | 20–25 |
| Tensile Strength (ASTM D412) | 1.8–2.2 MPa |
| Service Temperature Range | –40 °C to +150 °C |
Dow DOWSIL 7091 Silicone Adhesive Sealant – Frequently Asked Questions (FAQ)
Q1: What substrates does DOWSIL 7091 bond well to?
A: DOWSIL 7091 provides strong adhesion to a wide range of common industrial substrates including glass, aluminum, stainless steel, painted metals, and many rigid plastics—without requiring primers on most clean, dry surfaces.
Q2: Is DOWSIL 7091 suitable for outdoor applications?
A: Yes—this neutral-cure silicone sealant offers excellent resistance to UV exposure, temperature extremes, moisture, and ozone, making it well-suited for long-term exterior use in architectural and industrial assemblies.
Q3: How does DOWSIL 7091 compare to acetoxy-cure silicones in terms of compatibility?
A: As a neutral-cure (alkoxy-type) silicone, DOWSIL 7091 avoids the corrosive byproducts associated with acetoxy-cure systems—making it safer for use with sensitive metals, electronics, and non-metallic substrates like polycarbonate or acrylic.
Q4: Can DOWSIL 7091 be overpainted?
A: DOWSIL 7091 is generally not recommended for overpainting, as most conventional paints do not adhere reliably to cured silicone surfaces. For painted assemblies, consider alternative sealants formulated for paintability or use mechanical masking strategies.
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