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Acetoxy-cure silicone formulation offering rapid surface cure and excellent adhesion to common building substrates without primer.
Excellent resistance to weathering, UV radiation, ozone, and extreme temperature fluctuations (–40 °C to +150 °C).
Low modulus elasticity provides high movement capability (±25% joint movement) while maintaining long-term seal integrity.
Non-staining, non-corrosive, and compliant with ASTM C920 Type S, Grade NS, Class 25, Use NT, M, and T.
Low VOC content, meeting stringent indoor air quality requirements including GREENGUARD Gold certification.
Perimeter sealing of insulating glass units (IGUs) in commercial façades and curtain walls.
Sealing of expansion joints in precast concrete, aluminum, and stone cladding systems.
Weatherproofing of window and door perimeters in residential and light commercial construction.
Joint sealing in architectural metal panel systems and composite wall assemblies.
Interior and exterior glazing applications where high durability and optical clarity are required.
| Chemical Type | Acetoxy-cure silicone elastomer |
| Product Form | Thixotropic paste, single-component |
| Appearance | Opaque white, off-white, or clear (depending on variant) |
| Primary Applications | Structural and non-structural perimeter glazing; architectural joint sealing |
| Key Features | Primerless adhesion, fast skin-over, high movement accommodation |
| Benefits | Reduced labor time, long service life, consistent performance across climates |
| Compliance | ASTM C920 Type S, Grade NS, Class 25; ISO 11600 F25HM; GREENGUARD Gold |
| Shelf Life | 12 months from date of manufacture when stored unopened at ≤25 °C |
Q1: What substrates is DOWSIL 790 compatible with?
A: DOWSIL 790 adheres well to a broad range of common construction substrates including glass, aluminum, anodized metals, most painted surfaces, ceramic tile, and concrete—without requiring a primer in many cases. Surface cleanliness and compatibility testing under actual job conditions are recommended prior to full-scale application.
Q2: Can DOWSIL 790 be painted over after curing?
A: No, DOWSIL 790 is a high-performance silicone sealant and is not paintable. Its formulation is designed for long-term elasticity and weather resistance, and conventional paints do not adhere reliably to cured silicone surfaces.
Q3: How does temperature affect the cure speed of DOWSIL 790?
A: Cure speed increases with higher ambient temperature and relative humidity, and slows under cold or dry conditions. Optimal installation is typically achieved between 10 °C and 35 °C with moderate humidity; extended cure times may be expected outside this range.
Q4: Is DOWSIL 790 suitable for structural glazing applications?
A: No, DOWSIL 790 is formulated as a general-purpose, non-structural silicone building sealant. It is not intended for load-bearing or structural glazing applications, which require specialized high-strength silicone adhesives meeting specific industry performance standards.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
