Conformal coatings are used to protect printed circuit boards (PCBs) from dust, humidity/moisture, mildew/mold, temperature extremes, and other elements whose prolonged contact might interfere with assembly function. Coatings also enhance electrical clearance-tolerance, while safeguarding PCB components from contamination (particulate or otherwise), corrosive materials, and mechanical stress.
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Selecting a suitable conformal material for coating printed circuit boards (PCBs), related electronics, or other devices requires recognition of each coating type’s unique combination of benefits and drawbacks. These must be considered in relation to a given application.
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If, for some reason, you are told parylene is NOT a conformal coating, simply because it has no liquid phase of application, just walk away. And maybe have yourself a good laugh. For, as you may already know, parylene has repeatedly proven itself to be the most definitive of conformal coatings, for a variety of reasons, including:
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Application methods must first reflect the targeted substrate’s susceptibility to the coating material. Liquid coatings – acrylic, epoxy, silicone and urethane – each possess specific performance properties. Optimal protection and operational efficiency depend on
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Printed circuit boards (PCBs) electrically connect and power all but the simplest electronic products. To function as designed, PCBs and their components – capacitors, resistors, etc. – require protection against operating problems caused by corrosive liquids, dust, physical shock, temperature extremes and, in the case of medical implants, bodily fluids. Conformal coatings are applied over PCBs to safeguard mechanisms and maintain functionality.
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Conformal coatings insulate printed circuit boards (PCBs) and similar electronics; their protection increases devices’ tolerance to harsh environments. The result is undisturbed function through a range of frequently harsh operating environments and performance conditions. Conformal coatings provide these services for aerospace/defense, automotive, consumer, and medical devices. They are adaptable for LED uses, as well as MEMS/nanotechnology, and other uses.
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The conformal coating process requires watchful administration to ensure successful implementation. Recognizing the unique properties of various coating-types is critical to selecting the kind most applicable to the project and its purposes, while meeting clients’ material and operational specifications. Regardless of the coating material and the substrate, these five fundamental procedures are essential to good conformal films.
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Managing the conformal coating process begins with a precise definition of coverage required. Pre-process negotiations between the client, the coating provider, and end-user, clarify coating requirements. They include agreement about whether:
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Liquid application resins acrylic, epoxy, silicone and urethane are applied to electronic circuitry in a liquid format by brush, dip or spray techniques, either manually or through robotic processes; they require curing before they can be used.
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Masking tapes and boots both protect components for a selected range of masking functions. Choosing between the two is crucial to achieving optimal masking protection. Conductivity needs to be maintained in all cases. In addition, such operational factors as the:
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