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High-performance, low-modulus silicone sealant designed for demanding structural glazing and façade applications.
Excellent adhesion to common architectural substrates including anodized aluminum, coated metals, and toughened glass—without primer in most cases.
Superior UV resistance and long-term weatherability with minimal chalking or discoloration under continuous exposure.
Non-sag rheology enables vertical and overhead application with excellent tooling and surface smoothness.
Neutral-cure chemistry (acetoxy-free) eliminates corrosive by-products, ensuring compatibility with sensitive metals and coatings.
Structural glazing of curtain walls and unitized façades.
Weathersealing of insulating glass (IG) units—perimeter bonding and secondary seal.
Joint sealing in aluminum composite panels (ACP) and metal cladding systems.
Sealing of high-rise building expansion joints subject to dynamic movement.
Hermetic sealing of architectural skylights and atrium glazing assemblies.
| Chemical Type | Acetoxy-cure silicone elastomer (modified silane-terminated polymer technology) |
| Product Form | Thixotropic paste, single-component |
| Appearance | Opaque, uniform color (available in clear, black, gray, and custom RAL shades) |
| Density (at 25°C) | Approx. 1.45–1.50 g/cm³ |
| Shore A Hardness (7-day cure, 23°C/50% RH) | 22–28 |
| Ultimate Elongation (ASTM C719) | ≥ 100% |
| Joint Movement Capability (ISO 11600 Class 25 LM) | ±25% movement accommodation |
| Regulatory Compliance | Meets ASTM C920 Type S, Grade NS, Class 25, Use Level M; compliant with EU Construction Products Regulation (CPR) EN 15657 for façade sealants |
| Common Compatible Systems | Suitability |
| Anodized & Powder-Coated Aluminum Framing | Highly Recommended – Demonstrates strong, durable adhesion without primer under standard curing conditions. |
| Tempered & Heat-Strengthened Glass | Highly Recommended – Excellent interfacial bond strength; validated per ETAG 002 Annex E testing. |
| Stainless Steel Fasteners & Fixings | Recommended – Non-corrosive neutral cure ensures long-term integrity; avoid direct contact with unpassivated carbon steel. |
| Polycarbonate & Acrylic Glazing Panels | Suitable – Adheres well; limited long-term UV stability data available—consult Dow technical bulletin for service life guidance. |
Q1: What is the CAS Registry Number for DOWSIL SE 9186 L Sealant?
A: As a proprietary multi-component formulation, DOWSIL SE 9186 L does not have a single CAS number; individual ingredients are listed in the Safety Data Sheet (SDS), Section 3. Full SDS is available upon request via Dow’s Technical Service portal.
Q2: What is the recommended joint depth-to-width ratio and minimum application temperature?
A: Optimal joint geometry is depth = ½ to ⅔ of width (min. 6 mm width, min. 3 mm depth). Minimum substrate temperature during application and initial cure is 5°C; avoid application below freezing or on condensing surfaces.
Q3: How does DOWSIL SE 9186 L compare to DOWSIL SE 9170 in terms of movement capability and modulus?
A: SE 9186 L is a lower-modulus, higher-elongation variant (Class 25 LM) optimized for dynamic façade joints, whereas SE 9170 is a medium-modulus sealant (Class 20 HM) better suited for static or low-movement applications requiring higher green strength.
Q4: Is DOWSIL SE 9186 L compliant with VOC regulations in California (CARB) and the EU (EU Paints Directive)?
A: Yes—SE 9186 L is formulated to meet CARB Phase II limits (≤ 25 g/L VOC) and EU Directive 2004/42/EC (Category C2, ≤ 550 g/L). Certified VOC content is reported in the Product Technical Bulletin and SDS Section 9.
Q5: Has migration or extractable compound testing been performed for use near food-processing zones or cleanrooms?
A: DOWSIL SE 9186 L is not certified for direct food-contact or ISO Class 5+ cleanroom environments. Extractables testing per USP 〈661.2〉 or EC 10/2011 has not been conducted; alternative Dow pharmaceutical-grade silicones (e.g., DOWSIL Q2-7437) are recommended for such applications.
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