High-performance, acetoxy-cure silicone sealant offering rapid skin-over and excellent adhesion to glass, aluminum, and common construction substrates.
Low modulus formulation provides superior elasticity and long-term movement capability (±25% joint movement).
Excellent resistance to UV radiation, ozone, and extreme temperature fluctuations (–40 °C to +150 °C continuous service).
Non-staining and non-corrosive—safe for use with sensitive metals and anodized aluminum.
Meets ASTM C920 Type S, Grade NS, Class 25, Use NT, T1, M1, O1 for architectural glazing applications.
Structural and perimeter sealing of insulating glass units (IGUs) in commercial façades.
Weatherproofing of curtain wall systems and aluminum-framed windows.
Joint sealing in precast concrete cladding and metal composite panels.
Secondary sealing of solar panel frames and photovoltaic mounting systems.
General-purpose bonding and sealing in HVAC enclosures and industrial enclosures requiring elastomeric performance.
| Chemical Type | Acetoxy-cure silicone polymer |
| Product Form | Thixotropic paste, single-component |
| Appearance | Opaque white or clear, smooth uniform consistency |
| Primary Applications | Architectural glazing, curtain walls, IGU secondary seal, metal and concrete joint sealing |
| Key Features | Rapid cure, high elasticity, UV stable, non-corrosive, low modulus |
| Benefits | Reduced assembly time, long-term joint integrity, compatibility with sensitive substrates, no primer required on most surfaces |
| Shelf Life | 12 months from date of manufacture when stored unopened at ≤25 °C in dry conditions |
| VOC Content | <5 g/L (meets South Coast AQMD Rule 1168) |
Q1: What are the primary end-use applications for DOWSIL EA-3500?
A: DOWSIL EA-3500 is engineered for demanding structural bonding and sealing in architectural glazing, façade systems, and high-performance curtain wall assemblies—particularly where long-term durability, UV resistance, and adhesion to challenging substrates like anodized aluminum and coated glass are required.
Q2: Is DOWSIL EA-3500 suitable for use in weather-exposed exterior joints?
A: Yes—it is a high-performance, acetoxy-cure silicone sealant formulated to withstand prolonged exposure to rain, thermal cycling, UV radiation, and ozone, making it well-suited for permanent exterior joint applications in commercial building envelopes.
Q3: How does DOWSIL EA-3500 compare to neutral-cure silicones in terms of adhesion and cure speed?
A: As an acetoxy-cure system, DOWSIL EA-3500 typically offers faster surface cure and strong initial adhesion to metals and glass without primers—though it releases acetic acid during cure and is not recommended for copper, zinc, or alkaline substrates. Neutral-cure alternatives may be preferred for sensitive materials or indoor air quality–sensitive environments.
Q4: Can DOWSIL EA-3500 be painted after curing?
A: Standard silicone sealants—including DOWSIL EA-3500—are generally not paintable due to their low surface energy and chemical inertness. For painted joints, Dow recommends evaluating alternative sealant chemistries or consulting technical support for compatible overpaintable solutions.
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