Conformal Coating: Protection for Electronic Devices
Moisture-proof coatings are generally referred to as Conformal Coating.

A conformal coating is a very thin layer of polymer applied to printed circuit boards (PCBs) and components in electronic devices to protect them from moisture and other environmental factors. This process is widely implemented across different fields in the manufacturing of electronic devices.

Conformal coating is formed by applying a polymer (resin) solution onto the substrate or the surface of precision electronic components.

It is also called PCB coating or moisture-proof coating and is commonly applied to circuit boards, sensors, LEDs, motors, and other electronic devices.

Commonly used conformal coating materials include:

• Acrylics

• Epoxy resins

• Polyurethanes

• Silicones

• Fluoropolymers

The purposes of conformal coating include:

• Protecting circuit boards from moisture to prevent corrosion and ionic migration

• Preventing short circuits and arcing effects caused by humidity

• Anti-rust protection

• Protecting electronic devices from chemicals and solvents

• Providing circuit board protection while enabling lightweight design

• Preventing fire accidents caused by electrolyte leakage

With the increasing performance and miniaturization of electronic devices, the internal density of components continues to rise.
As electronic devices become more compact, external stresses on circuit boards from heat, moisture, and chemicals (such as solvents used in other components) are also increasing.