Pcb Varnish. To ensure solderability and to protect exposed copper circuitry. Knowing which types of surface finishes exist is simple enough but how do you determine which is best for your pcb.
Once it hardens it remains transparent and creates a hard protection layer but still maintains some flexibility that prevents it from cracking if you have some flexing in your pcb. To ensure solderability and to protect exposed copper circuitry. Epec engineered technologies anyone involved within the printed circuit board pcb industry understand that pcbs have copper finishes on their surface.
A pcb surface finish is a coating between a component and a bare board pcb.
Hasl osp and enig when creating surface finishes for printed circuit boards pcbs you can choose from either organic or metallic materials. The simplicity of the process a flat surface and a low cost. The 9 different pcb surface finishes electroless nickel immersion gold enig enig is the most popular option and is used on about 80 of all pwbs. If they are left unprotected then the copper will oxidize and deteriorate making the circuit board unusable.
