Conformal Coating for Printed Circuit Board

Today we will introduce what is conformal coating, what is the advantages of conformal coating.

Conformal Coating is a method of coating on the printed circuit board to form a protective film, this layer of protective film is usually only a thin layer (about 30 ~ 210 um), it can be used to strengthen the ability of electronic products, that: moisture-proof, dust-proof, anti-fouling, chemical-pollution-proof, also can prevent the solder joint and the conductor from exposing to the air and to the problem of corrosion, it can aslo plays the role of shielding and eliminate some electromagnetic interference, and to be an insulation.

Conformal Coating has additional use, is that to increase the wear resistance and solvent resistance of the components, can also cause stress release when the high temperature change.

Because of these advantages of conformal coating, so it is often used in some products exposing to the harsh environment, such as high chemical gas environment, high pollution or dusty environment, high humidity, high or low temperature environment. In consumer electronic products the conformal coating is commonly used to protect or insulate some electrical products or electronic components devices, such as motors, generators, transformers, solenoid valve switches...

Some Conformal Coating ink appears color under UV light, easier for visual checking▼

Gas station or the parts to be used on an aircraft will be required to comply with ATEX standard, to paint onformal coating is one of the requirements, in order to avoid any electronic products may have short circuit, sparking problem resulting in fire or explosion accidents.

Conformal Coating basically have material such as: Silicone, Acrylic, Urethane (polyurethane) and other three kinds of transparent material, also used Epoxy (epoxy resin), but its opaque material, so fewer people use.

Conformal Coating can be applied with 4 methods: dipping, spraying, brushing, selective coating. We have 2 automatic selective coating lines in house now, with this both the quality and production efficiency have been highly improved, to meet customers' requirements.

Selective Coating▼

The ink can use dry by two kinds of ways: normal room temperature curing, or oven heat curing.