Conformal Coating Electrolube are thin polymer films that cover and protect solder joints, electronic component leads, exposed traces and other metallised areas on PCBs from corrosion in end-use environments.
Moisture, condensation, salt mist, corrosive gases or a combination of all these elements trigger the onset of corrosion, which can be accelerated by solder residues and other processes prior to coating.
Why Use a Conformal Coating on Your PCB?
With the increasing adoption of electronics in developing countries, where atmospheric pollution levels are generally higher, the need for corrosion protection is growing.
In addition, there is a growing trend towards smaller devices with greater functionality, resulting in higher density assemblies that are expected to operate trouble-free for extended periods in increasingly aggressive operating environments.
How to Choose the Right Electrolube Conformal Coating
Electrolube conformal coatings can have different chemical properties and can be more or less suited to your needs. This table summarises the main characteristics.
| Coating | Advantages | Disadvantages |
| Acrylic | Easy to use. Good general protection. Easy to rework. | Low solvent resistance. High VOC emissions. Adhesion hard to predict. |
| Urethane | Easy to use. Better chemical resistance. | High VOC emissions. Difficult to rework. |
| Silicone | Excellent performance at high and low temperatures. Perfect water protection. Low odour, easy to use. | Poor protection against corrosive gases. May emit VOCs. |
| UV Curing | Low VOC emissions. Fast curing. Reduced material in processing. | Very sophisticated process. Difficult to rework. |
Key Factors That Affect Conformal Coating Performance
Remember that conformal coating can only protect surfaces where it is applied with perfect coverage, and that gaps, bubbles and cracks in the coating are likely to initiate the corrosion process.
Choosing the right conformal coating chemistry for your needs and one that can withstand the expected environmental challenges is essential. Ask an expert which conformal coating is right for you.
