422C – Silicone Conformal Coating

422C is a 1-part, acrylic-silicone blend waterproof 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.

  • Certified UL94 V-0 (File# E203094)
  • Maximum service temperature of 200 °C
  • Fast cure – tack free in about 10 min; dries in 20 min at 65 °C [149 °F]
  • Fluoresces under UV-A light
  • Validated for selective robotic coating equipment
  • Corrosion resistant

This circuit coating 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.

This circuit board waterproof coating is the best conformal coating where moisture protection, wide range service temperature, and flexibility are required. It works well as a first-person view (fpv) conformal coating and is an excellent choice for waterproofing remote systems, such as drones and remote-control cars.

This product is also available in spray and pen formats.

For a UL 746E-certified acrylic conformal coating, visit 419E.

We also offer epoxy (4225), polyurethane (4223F), and UV-curable (4200UV) conformal coatings.

Part # Net Vol. Net Wt. Packaging Packaging Preview
422C-P 5 mL 4.61 g Pen
422C-340G 406 mL 340 g Aerosol
422C-55ML 55 mL 50.7 g Bottle
422C-55MLCA 55 mL 50.7 g Bottle
422C-945ML 945 mL 871 g Can
422C-3.78L 3.78 L 3.48 kg Can
422C-19L 18.9 L 17.4 kg Pail
Regional Availability Available Alternative
Unavailable in EU/UK 422B
Warning WARNING! This product can expose you to chemicals including toluene, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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