LOCTITE® SI 5293 is a one-component, UV-curable alkoxy silicone conformal coating designed to provide environmental protection for printed circuit boards (PCBs) and other sensitive electronic components. It fluoresces under UV light and has a secondary moisture cure for shadowed areas.
| Property | Value |
|---|---|
| Appearance | Transparent amber to yellow liquid |
| Specific Gravity @ 25°C | 1.0 |
| Flash Point | See SDS |
| Viscosity (Brookfield RVT, Spindle 1, 10 rpm) | 400 to 800 cP |
| Solids Content | ≥85% |
| Property | Value |
|---|---|
| UV Cure Wavelength | 365 nm |
| Surface Tack-Free Time @ 22°C / 50% RH | 10 to 24 hours |
| Full Cure Time at Ambient Conditions | 72 hours |
Physical Properties:
| Property | Value |
|---|---|
| Coefficient of Thermal Expansion | 300 × 10⁻⁶ K⁻¹ |
| Thermal Conductivity | 0.18 W/(m·K) |
| Glass Transition Temperature (Tg) | -40°C |
| Water Vapor Transmission Rate | 1.23 – 1.37 g/(h·m²) |
Electrical Properties:
| Property | Value |
|---|---|
| Volume Resistivity | 1×10¹⁴ Ω·cm |
| Dielectric Breakdown Strength | 16 kV/mm |
| Dielectric Constant / Dissipation Factor | |
| @ 100 Hz | 4.6 / 0.005 |
| @ 1 kHz | 4.1 / 0.006 |
| @ 1 MHz | 4.1 / 0.006 |
Other Cured Properties:
| Property | Value |
|---|---|
| Shore Hardness (Durometer OO) | 60 to 90 |
| UV Depth of Cure | ≥1.3 mm |
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