Several types of materials are used for conformal coating of Printed Circuit Boards (PCBs). Silicone conformal coating is the popular choice with most users. A variety of silicone conformal coating options is available. The different chemical properties exhibited by these materials can meet diverse industry demands. However, the material used ultimately depends on the application requirements.
When to Use Silicone Conformal Coating
Silicone conformal coating can be a wise option in the following instances:
1. High Temperature Applications
2. Moisture-rich Environments/ Applications
3. Quickturn Orders
When Not to Use Silicone Conformal Coating
The thickness of silicone conformal coating ranges between 0.00197″and 0.00827″. This measurement is much thicker than that applied when using other materials. This can prove to be difficult to work with when:
1. The PCB and application has tight clearance tolerances.
2. The solder joints are not strong enough to support stress associated with thick PCB conformal coating layers.
Hence, silicone conformal coating has various advantages and limitations, as do all materials. The conformal coating material should be chosen in accordance with the application with which it will be integrated.