MG Chemicals 422B-55ML 422B Silicone Modified Conformal Coating

SKU# 422B-55ML
MFR# 422C-55ML
  • Certified UL 94V-0 (File# E203094)
  • Maximum Constant Service Temperature of 200 °C [392 °F]
  • Fluoresces under UV-A Light
  • Validated for Selective Robotic Coating Equipment
  • Excellent Corrosion Resistance—Tested in Salt Spray Environment with No Oxidation or Coating Damage
Select Store to check availability.

This item is oversized and requires a quote.

We will determine a shipping option and the quote will be updated with shipping costs.

Questions about the process? Call us at (800)-531-5369.

Have questions? 800-531-5369


Hazmat Shipping Required - Please add this item to a Quote for updated Shipping Costs.


422B is a 1-part, acrylic-silicone blend conformal coating that cures to a durable, flexible and smooth finish. It is easy to apply and can be handled in only 10 minutes. It may be removed with appropriate strippers or soldered through for repair or rework.

422B is designed for applications where both high service temperature and flexibility are required. It puts minimum stress on components during thermal cycling, making it ideal for applications that involve a wide temperature range. It provides strong protection against moisture, corrosion, fungus, dirt, dust, thermal shock, short circuits, high-voltage arcing, and static discharge.

Cured Properties
  • Resistivity: 1.2 x 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
  • CTE prior Tg: 275 ppm/°C
  • Service Temperature Range: -40–200 °C
Usage Parameters
  • Dry Time To Handle (1 coat): 10 min
  • Dry Time To Handle (2 coats): 15 min
  • Minimum Re-coat Time: 3 min
  • Recommended Film Thickness: 25–75 µm
  • Theoretical Coverage @ 25 µm: 70 000 cm2/L
Uncured Properties
  • Viscosity @ 25 ˚C: 10 cP
  • Density: 0.90g/mL
  • Percent Solids: 28 %
  • Shelf Life: 5 y
  • Calculated VOC: 289 g/L
Material Safety Data Sheet (MSDS)

Ratings & Reviews