What is conformal coating on PCB?
A conformal coating is a thin polymeric film applied to a printed circuit board (PCB) in order to protect the board and its components from the environment and corrosion.
Why conformal coating is used in PCB?
The performance of a PCB can be impacted by many external or environmental factors like moisture, extreme temperature, salt sprays, and chemicals. A conformal coating ensures the protection against PCB against these types of environmental contaminants and conditions.
What is conformal coating process?
A conformal coating is one such process that involves applying a thin, polymeric and non-conductive film “conforming” to the surface of the board. It is applied to protect the PCB from moisture, dust, and temperature variations.
What are the types of conformal coating?
Types of Conformal Coating The categories are: urethane resin (UR), epoxy resin (ER), acrylic resin (AR), silicone resin (SR) and parylene (XY).
Is conformal coating necessary?
Using conformal coating is absolutely necessary for your PCBs if you want to protect them from contaminants and dangerous environments. For instance, excess moisture can speed up decomposition, reduce insulation resistance and result in conductor corrosion.
Is conformal coating waterproof?
While conformal coatings can offer a moisture resistant layer of protection, most cannot be considered waterproof. Conformal coating can, however, prevent current leakage or corrosion due to ambient moisture.
How long does conformal coating last?
Oxidation and Temperature: It was reported that the minimum useful lifetime of Parylene conformal coating at 25 °C (in the absence of light) is 2,200 years for type N and 130,000 years for type C.
How do I make my PCB water resistant?
Step 3: The Different Methods
- Method #1 – Clear Nail Varnish. This is probably the easiest and most common method hobbyists use to try and prevent moisture and dust from getting on a circuit board.
- Method #2 – Special PCB Varnish.
- Method #3 – UV Curable Soldermask.
- Method #4 – Clear Silicone Adhesive.
Can you waterproof electronics?
Epoxy is commonly used as a potting material for electronics. In epoxy potting, the entire PCB is encased in the material. This method ensures that the electronics are waterproof while providing great mechanical strength.
