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High-performance, one-component, moisture-curing silicone sealant with excellent adhesion to glass, aluminum, and painted surfaces.
Low modulus formulation provides superior flexibility and stress relief in dynamic joints.
Excellent resistance to UV radiation, ozone, and extreme temperature cycling (-40 °C to +150 °C).
Non-corrosive and acetoxy-free chemistry—safe for sensitive substrates including electronics and architectural metals.
Good skin-over time and deep-section cure capability for reliable performance in varied environmental conditions.
Structural glazing systems in commercial curtain walls and façades.
Weatherproofing of insulating glass units (IGUs) and perimeter sealing of windows and skylights.
Sealing and bonding in transportation applications, including railcar and bus glazing assemblies.
Architectural metal panel joint sealing where movement accommodation and long-term durability are critical.
Industrial enclosures and electronic housings requiring environmental protection without substrate corrosion.
| Chemical Type | One-component, acetoxy-cure silicone polymer |
| Product Form | Thixotropic paste in cartridge or sausage packaging |
| Appearance | Opaque white or translucent gel |
| Primary Applications | Structural and non-structural glazing, weathersealing, and industrial bonding |
| Key Features | UV stable, low modulus, non-corrosive, good adhesion without primer on many substrates |
| Shore A Hardness (7 days, 23°C/50% RH) | 25–35 |
| Tensile Strength (ASTM C1135) | ≥0.6 MPa |
| Joint Movement Capability | ±25% (Class 25 according to ASTM C920) |
Q1: What is the primary function of DOWSIL SS-3551 Silicone in industrial formulations?
A: DOWSIL SS-3551 Silicone is a silicone-based surface modifier designed to improve substrate wetting, reduce surface tension, and enhance leveling and slip in solvent-borne and high-solids coatings, inks, and adhesives.
Q2: Is DOWSIL SS-3551 Silicone compatible with UV-curable systems?
A: Yes, it is generally compatible with free-radical UV-curable formulations; however, compatibility and performance should be verified in the final system due to potential interactions with photoinitiators or acrylate monomers.
Q3: How should DOWSIL SS-3551 Silicone be incorporated into a formulation?
A: It is typically added during the let-down stage under moderate agitation. Pre-dilution in a compatible solvent may aid dispersion, especially in low-viscosity systems. Avoid high-shear mixing immediately after addition to prevent excessive foam generation.
Q4: Does DOWSIL SS-3551 Silicone affect recoatability or intercoat adhesion?
A: When used within recommended dosage ranges, it generally does not hinder intercoat adhesion; however, overuse may lead to surface migration and potential adhesion issues—formulators are advised to conduct intercoat testing under application-specific conditions.
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E-mail: wangxingqiang@ericwchem.com
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