Conformal coating is a cost-effective way to protect electronic products against water, chemicals, and dust, which could harm the PCB.
　　In some cases, you can save yourself a lot of money and anguish by applying waterproof conformal coating on a PCB rather than going through the substantial effort of creating an IP65 waterproof housing
　　In this article, we will look at the different types of conformal Waterproof Resin Coating and the various application methods. When to use a conformal coating? Which conformal coating method will work best? What are the pros and cons of each method?
　　We’ll also discuss, conformal coating inspection, conformal coating removal, and electronic coating.
　　1- Waterproof Conformal Coating Vs Waterproofing The Housing
　　Making a plastic housing waterproof generally requires a lot of skill and experience. Even then quite a few iterations of testing and mold modifications will be needed to get it right.
　　It generally involves adding a soft material such as TPR between the mating surfaces. The cheapest way to do this is to friction-fit or glue a TPR o-ring in place, but this is a laborious and error-prone process.
　　Better is to combine the soft and hard plastic into a single part, using overmolding. For high quantity products, such as toothbrushes 2K molding is used technology, where a mold…. molds and injection machines.
　　The molds and injection machines needed for this technology tends to be roughly 3 times as expensive as for a single plastic part.
　　For order quantities under say 50K it is much more advantageous to use the “sneaker method” where an ABS part is taken out of one mold and walked over to the next machine where the TPR is injected over it.
　　Best is if the ABS part is still warm so that the second material will bond better to the first.
　　Conformal coating basically bypasses all those additional investments in injection molds, engineering, and endless testing and mold modifications.
　　2- The Reasons To Use A Conformal Coating
　　During the electronics product development process comes the embedded electronic design stage, especially the core of electronic products: the PCB.
　　In consumer electronics, the failure of an electronic device such as a mixer simply means a costly RMA. But the reliability is even more important in B2B industrial applications. Many electronic systems are critical to be able to run production or service, while in some cases electronic failures can be life-threatening.
　　So protecting the circuit is important, especially so when it is exposed to an aggressive environment (Solvents, high temperature, humidity/water spills, etc). Waterproof conformal coating can help with all of this.
　　In fields such as automotive, aeronautics, or medical, it is essential to provide PCBs with a suitable conformal coating in order to increase reliability.
　　When applying a conformal coating, there are four factors to be checked and optimized:
　　The conformal coating material
　　The conformal coating application method
　　The conformal coating curing and drying method
　　The conformal coating inspection method
　　Your best pick for each of these factors will depend on the production volume and lead times, the fixtures available, the environment, the complexity of the PCB, etc.
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