Let's continue to learn about the common quality requirements of conformal coating.
The Quality requirements for PCB when applying conformal coating include:
1. No runs and drips:
After applying conformal coating, the PCB surface must not have any paint runs or drips. Especially when using a brush to apply the coating, it is essential to ensure that drips do not occur on the isolated areas of the board that do not require coating.
2. Coating uniformity:
The conformal coating layer should be smooth, shiny, and uniformly thin across the entire PCB surface. This layer must fully cover the solder pads, surface-mounted components, or conductive surfaces to provide effective protection.
3. Coating and component surface quality:
There should be no bubbles, pinholes, ripples, shrinkage holes, dust, or foreign objects on the coating surface or components. The coating should be free from powdering and peeling. Importantly, the coating should not be touched arbitrarily before it has dried on the surface.
4. Local isolation areas:
For components or areas on the PCB that require local isolation, conformal coating should not be applied to ensure normal circuit functionality and ease of subsequent maintenance.
Next, we will learn about which electronic components or parts that can’t be covered by conformal coating.
