Conformal coatings are thin layers of polymer applied to the surface of printed circuit boards (PCBs), typically between 25 m and 150 thicknesses, to protect and electrically insulate circuits and board assemblies from environmental stress. These coatings ensure PCB reliability in environments where moisture, condensation, dust, dirt, salt, chemicals, abrasion, thermal and mechanical shock, and other factors can affect circuit performance. These products were originally developed for military applications. They can design smaller electrical assemblies while increasing mechanical support for the components and improving the fatigue life of the solder joints. PCBA conformal coatings are integrated into their products by industries such as aerospace and defense, consumer and automotive electronics, telecommunications, and appliance manufacturing. Many of these applications require conformal coating PCBs to protect them from potentially harsh environments, such as satellites exposed to extreme space (atmosphere) conditions and sensitive PCB circuits and sensors in automotive electronics that are constantly in use.
Every year, the electronics industry requires smaller printed circuit boards to function in harsher and more demanding environments. Conformal coatings are applied to PCB surfaces to protect and isolate circuits from harsh environments, or to improve dielectric withstand voltage between conductors. Here are five compelling reasons to use them in your application:
1.Provides full protection: Conformal coatings are designed to protect circuit boards from moisture, dust, fungus, extreme temperatures, and other contaminants. These coatings are resistant to many types of solvents and chemicals, and they are also resistant to heat. Normally, boards exposed to these types of environments will degrade, but conformal coatings can slow or even prevent this effect. Without a coating, leaks or corrosion can occur, damaging delicate components.
2.Improved dielectric properties: When a conformal coating is applied to PCBs, it prevents corrosion and arching while increasing mechanical support for components and improving the fatigue life of solder joints. It also helps to compress the circuit footprint, resulting in tighter spacing between components. In addition, it significantly slows down the growth of tin whiskers, reducing the risk of tin whiskers causing short circuits between adjacent conductors.
3. Convenient construction: spraying, dipping and brushing. With a single coating, they provide reliable protection for rigid and flexible film laminates as well as metal, glass or plastic substrates. They are easy to dispense, and for thicker coating requirements, some materials can be applied multiple times.
4.Save time and money: Since there is no need for housings and housings, conformal coating enables lighter weight and smaller components. For conformal adhesive manufacturers, less PCB repair means less time and labor, and more savings.
5.Protect sensitive information: Some conformal coatings have an opaque color that helps cover markings, labels, and other markings on the board.
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