• Item Name: 422B Silicone Modified Conformal Coating
• Manufacturer: MG Chemicals
• Technologies: Acrylic-silicone blend conformal coating
• Color: Clear (fluoresces under UV-A light)
• Cure Type: Room temperature (48 h) or oven cure (20 min @ 65 °C)
• Package Size: 945 mL, 3.78 L, 18.9 L
• Shelf Life: 5 years
422B Silicone Modified Conformal Coating is a one-part acrylic-silicone blend designed to cure to a flexible, durable, and smooth protective layer. It provides strong resistance against corrosion, fungus, moisture, dust, dirt, and static discharge. With a quick handling time of just 8 minutes and the ability to withstand high service temperatures up to 200 °C, it minimizes stress on components during thermal cycling. The coating fluoresces under UV-A light for inspection and is UL 94 V-0 certified, ensuring flame resistance.
Protection of printed circuit boards and electronic assemblies.
High-temperature applications requiring flexibility and durability.
Prevention of corrosion, short circuits, high-voltage arcing, and electrostatic discharge.
Suitable for selective coating, spray, brush, and dip applications.
Environments involving moisture, fungus, dirt, and thermal cycling.
| Property | Uncured (Not Mixed) | Cured (After Application) |
|---|---|---|
| Viscosity @ 25 °C | 10 cP | – |
| Density | 0.90 g/mL | – |
| Percent Solids | 28 % | – |
| Shelf Life | 5 years | – |
| VOC Content | 289 g/L | – |
| Resistivity | – | 1.2 × 10¹⁵ Ω·cm |
| Dielectric Strength | – | 1,056 V/mil |
| Dielectric Withstand Voltage | – | >1,500 V |
| Dielectric Constant @ 1 MHz | – | 1.99 |
| Dissipation Factor @ 1 MHz | – | 0.012 |
| Glass Transition Temperature (Tg) | – | 29 °C |
| Coefficient of Thermal Expansion | – | 275 ppm/°C (prior Tg) |
| Service Temperature Range | – | -40 to 200 °C |
| Dry Time to Handle | 8 min (1 coat), 15 min (2 coats) | – |
| Minimum Recoat Time | 3 min | – |
| Recommended Film Thickness | – | 25–75 µm |
| Theoretical Coverage @ 25 µm | – | 70,000 cm²/L |
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