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Dow DOWSIL SZ-1605 Fluid is a high-performance silicone surfactant in the DOWSIL series, designed for industrial production of rigid polyurethane foam. With excellent interfacial activity and foaming regulation ability, it stabilizes the foaming system, regularizes cell structure, effectively improves foam thermal insulation and structural strength
Wide Temperature Stability - Stable performance from -40℃ to 200℃, suitable for extreme working conditions
Efficient Waterproof Sealing - IP68 moisture and corrosion resistance, isolating water vapor and medium erosion
Excellent Electrical Insulation - High volume resistivity, ensuring insulation safety of electronic components
Food-Grade Compliance - Meets FDA and NSF H1 certifications, suitable for incidental food contact scenarios
Electronic & Electrical Field - Waterproof sealing for connectors and wiring harnesses, lubrication and insulation for switch contacts
Industrial Equipment Field - Long-lasting lubrication for bearings and gears in humid/chemical environments, anti-aging for rubber and plastic parts
Food Machinery Field - Certified models for lubrication and sealing protection of food equipment
Medical Device Field - Sealing and lubrication for precision instruments, suitable for biocompatibility verification scenarios
| Brand | DOW |
| Chemical Composition | Polydimethylsiloxane (PDMS) + Silica Thickener |
| Appearance | Paste |
| NLGI Consistency Grade | Grade 2 |
| Penetration (25℃) | 265 - 295 (0.1 mm) |
| Operating Temperature Range | -40 ℃ ~ +200 ℃ |
| Volatiles (24 h / 200 ℃) | < 1.0 % |
| Dielectric Strength | > 15 kV/mm |
| Volume Resistivity | > 1 × 10¹⁵ Ω·cm |
| Waterproof Sealing Grade | IP68 |
Q1: What is the primary function of DOWSIL SZ-1605 Silicone Oil in industrial formulations?
A: DOWSIL SZ-1605 is a specialty silicone oil designed primarily as a surface modifier and release aid. It imparts excellent lubricity, improves substrate wetting, reduces surface tension, and enhances slip and leveling—particularly in coatings, inks, adhesives, and sealants where controlled surface behavior is critical.
Q2: Is DOWSIL SZ-1605 compatible with common polymer systems such as acrylics, polyurethanes, and epoxy resins?
A: Yes, DOWSIL SZ-1605 exhibits broad compatibility with many thermoset and thermoplastic systems, including acrylics, polyurethanes, and epoxies. Its low volatility and stable molecular structure support incorporation without significant risk of phase separation or adverse interactions—though compatibility testing under end-use conditions is always recommended.
Q3: How should DOWSIL SZ-1605 be incorporated into a formulation to ensure optimal performance?
A: It is typically added during the final dispersion or let-down stage under moderate agitation. Pre-dilution in a compatible solvent or carrier may aid uniform distribution. Dosage depends on formulation requirements but generally ranges from 0.1% to 2% by weight relative to total formulation mass.
Q4: Does DOWSIL SZ-1605 affect the cure profile or pot life of reactive systems?
A: In most cases, DOWSIL SZ-1605 does not significantly interfere with standard cure mechanisms—including moisture-cure, thermal-cure, or UV-cure processes—when used within typical dosage ranges. However, it may slightly extend surface tack-free time in some condensation-cure systems due to surface migration effects; formulation-specific evaluation is advised.
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