RoHS Compliant

Silicone Modified Conformal Coating

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  • Description
  • Technical Data
  • MSDS
  • Usage Instructions
  • FAQ
  • Resources

Ideal for high temperature environments. Silicone Modified Conformal Coating (422B) is a flexible finish product that provides a protective coating for printed circuit boards against moisture, corrosion, and thermal shock. It protects and insulates electrical and electronic components and assemblies, including generators, motors, transformers, relays, and solenoid coils. For spraying, liquid can be thinned using M.G. Thinner Cleaner. Thin up to one half part thinner to one part coating.

  • Certified UL 94V-0 (File # E203094)
  • Maximum Service Temperature of 200 °C
  • Fast Cure - tack free in 6 min at room temperature, full cure in 20 min at 65 °C
  • Protects electronics from moisture, corrosion, fungus, thermal shock, and static discharges
  • Easy to inspect: fluoresces blue at 437 nm ± 65 cm under UVA light
  • Extended Shelf Life avoids worries about premature hardening and wastage
  • Easy rework and repairs: Solders through the coat • removable with Cat. No. 435 thinner or Cat. No. 8310 stripper

Available Sizes

Catalog Number Sizes Available Description
422B-55ML 55 ml (2 oz) Liquid (includes brush cap)
422B-340G 340 gram (12 oz) Aerosol
422B-1L 950 mL (1 quart) Liquid
422B-4L 4L (1 gal) Liquid
422B-20L 20 L (5.3 gal) Liquid
422B-P 5 mL (0.16 oz) Pen
Usage Instructions

Directions of Use

Best results will be obtained by applying to thoroughly cleaned and dried parts or materials. It is essential that surfaces be free of any trace of grease or organic substances. At room temperature, the product will tack free in approximately 5-7 minutes, and full cure will be achieved in approximately 48 hours. Curing may be accelerated by applying moderate heat with either a convection oven or infrared lamps. We recommend curing in a convection oven at 65°C (149°F) for one hour, but other temperature and time combinations can work well. Heat curing will improve the physical strength of this coating.
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