Traditional conformal coatings protect the circuit well if they are selected correctly. However, where the coating is not applied there is little or no protection.
Nano coatings (FC), ultra thin coatings of thickness <2μm, provide hydrophobic properties and don’t need masking.
The lack of need for masking is due to the coating thickness being so thin that there is no resistance to removing the material. This means the FC can coat all of the circuit including connectors and offer the protection of the coating.
However, this very fact means the FC coating is delicate to handle and may not provide the long term reliability needed like a traditional coating.
So, what if we could combine the two materials and have the properties of both?
The circuit board would have:
The long term protection due the traditional conformal coating
The hydrophobic nature due to the FC coating
Protection all across the circuit board
Nexus have been experimenting wth dual coating with both traditional conformal coatings and ultra-thin coatings.
The results are extremely interesting for potentially increasing the protection of the circuit without adding a significant amount of cost to the process.