Sun&Lynn health care PCB factory tell you, a conformal coating is a polymeric thin film applied over a PCB surface to protect the board and its components from corrosion and environmental contaminants. 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.

Health care PCB factory , By providing protection from contaminants and environmental factors, the conformal coatings prevent corrosion of conductors, solder joints and short circuits. They also provide durable insulation to help reduce thermal and mechanical stress on the components.

Conformal coatings are an important part of printed circuit boards and are used in a wide range of industries including aerospace, automotive, military, marine, lighting, consumer electronics and industrial.

The thickness of the conformal coating usually varies from 3-8 mil (0.075-0.2 mm). 

Types of PCB Conformal Coating

Based on the chemical composition, the conformal coatings are classified into five types. As health care PCB factory know,they are acrylic, epoxy, urethane, silicone, and paraxylylene. The selection of a particular coating is based on the application of PCB and electronics requirements. Protecting a PCB is important, but the selection of appropriate material is essential.

Acrylic Conformal Coating:

Acrylic Resins(AR) are preformed acrylic polymers that are dissolved in a solvent and used to coat a PCB surface. The acrylic conformal coating is applied by using a hand brush, sprayed, or dipping the board in an acrylic resin coating. This is the most used conformal coating for PCBs.

Polyurethane Conformal Coating:

Polyurethane (UR) coatings offer excellent protection against the effects of chemicals, humidity, and abrasion. Polyurethane (UR) conformal coating is easy to apply but difficult to remove. Spot repairability (by thermal or soldering iron means) is not recommended as it will result in the emission of toxic gasses (isocyanate).