All Conformal Coatings can be described as semi permeable membranes. Although they protect the assembly from the negative effects of high humidity environments and water vapor, Conformal Coatings DO NOT render electronic or printed circuit assemblies waterproof against standing water.
With a properly applied Conformal Coating an electronic assembly MAY be able to withstand full contact with water for a short time. However this is NOT RECOMMENDED.
Wednesday, 16th January 2008