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What Is Conformal Coating?
Why Is a Conformal Coating Used?
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How to Apply Conformal Coating?
When applying conformal coating, PCB assembly manufacturers offer a wide range of services that can help ensure the best results. The most common type of PCB coating is a liquid-based coating applied using various methods such as spraying, dipping, brushing and electrostatic spraying. It is essential to select the correct type of conformal coating to ensure the highest level of protection for your circuit board.
The Operation Process for Conformal Coating
The usual sequence of operations is to test the filled functionality of the circuit board first and then tape or mask the areas that do not need coating. If the application allows, this can be done using temporary stencils or essential tape. The coating is then applied at a uniform thickness and waited until dry. Once the PCBA has been coated and dried, the battery pack can be mounted, and the final assembly completed. The completed battery pack can now be sent to the packaging level for testing steps, validation, packing and shipping to the customer.
How to Remove the Conformal Coating from PCB?
The method and material used to remove the conformal coating are determined by the type of PCB coating, its hardness, and the size of the area which needs removal. The most common removal methods are chemical stripping, mechanical stripping and heated stripping. When preparing a PCB for rework and repair, be very careful in stripping the coating. Careful thought, experience and handling skills are required to select the most appropriate removal method.
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Frequently Asked Questions
We need a conformal coating for PCB because it protects the circuit board from mechanical and chemical damage and allows electronics to maintain their long-term functionality.
A conformal coating is a speciality polymeric film-forming material used to protect circuit boards, components and other electronic components from adverse environmental conditions caused by corrosive air, humidity, heat, fungus and contaminants (such as dust and dirt).
The most common materials used to make conformal coatings are epoxy resins, acrylic resins, polyurethanes, silicone resins and poly-p-xylene.
The following are several ways to waterproof the PCB.
Use waterproof material such as FR-4 material to make PCB
The structure of a PCB is waterproof, effectively isolating the external package from the internal electrical part.
Potting adhesive waterproofing.
Cover the PCB with nano-waterproof coating.
There are five common types of conformal coatings.
Select the material for the conformal coating.
Different materials have different properties, and their costs vary.
Determine which components require conformal coating.
Not all components in electrical equipment will benefit from the conformal coating.
Review the different component options to show the range of components that need conformal coating and the reasons behind them.
The conformal coating can be applied by way of spraying or dipping.
It can last for many years, depending on the usages environment.
Before applying the conformal coating, the water and oil on the surface of the PCB and components must be removed first.
After the surface of the first coating film dries, we can apply it the second time.
The used brush, spray gun, etc. should be washed in time for the next time. Pay attention to ventilation when applying the conformal coating to facilitate solvent evaporation in the coating and ensure safety.
The conformal coating, once not used up, should be covered in time for next time.