Conformal Coating vs. Potting

There are two common methods for circuit board protection, conformal coating and potting. Depending on the project, the use of one of these two options typically provides sufficient protection to a circuit board.

What is Conformal Coating?

Conformal coating is a protective, nonconductive dielectric layer that is applied onto the printed circuit board assembly to protect the electronic assembly from damage due to contamination, salt spray, moisture, fungus, dust and corrosion caused by harsh or extreme environments.

What is Potting?

Potting is the covering of an electronic or electrical device to protect it from the surrounding environment. The potting method uses a “pot”, or shell, to put the device in. Then, the liquid potting compound is poured to the top of the case, covering the device and completely encasing it. The case becomes part of the finished unit. This is the most commonly used method, especially for high speed and many-units-per-hour production-line conditions.

Should I use Conformal Coating or Potting?

Typical projects that use potting instead of conformal coating would be circuit boards that are going to be facing potential impact damage or rough mechanical abrasion. Depending on the type of potting compound, potting is a very clear choice for impact resistance.

If rework is necessary or there are any sort of thickness or weight restrictions, conformal coating would be ideal. Conformal coating is very easy to inspect and can be reworked if needed. Potting does not offer the flexibility that most contract manufacturers demand in a protective finish.