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How to Make Sure That Your Conformal Coating Actually Conforms

Posted by Dan Griffin on Oct 1, 2020 11:00:00 AM

Take a quick look at the photograph on your right. If you are in the business of PCB manufacturing with conformal coatings, does it frighten or concern you at all? Does the magnified coating appear to truly “conform” to the surfaces evenly? And if not, what effect, if any, might this have on the protection of your PCBs?

First of all, don’t panic. What you see in the photograph is not unusual and is not necessarily a problem. It is important, however, that if you are in the business of applying conformal coatings, you should have a clear understanding of some of the unique challenges they present.

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Topics: conformal coating, silicone conformal coating, Humiseal, Conformal Coating Process

Alternatives to Silicone Conformal Coatings Exist

Posted by Dan Griffin on Sep 19, 2018 7:00:00 AM

For many electronics manufacturers, the original justification for specifying a silicone coating is lost deep within the mists of time and it may be time for a re-evaluation and consideration of the question,

“Do we really need a silicone conformal coating?”

Humiseal® remains in a uniquely qualified position to help you answer this question. Unlike many coatings sources, Humiseal offers a full line of all the major conformal coating technologies including acrylics, urethanes, synthetic rubbers, water-borne, and yes; silicones. As a result, you can be certain of an unbiased approach to product evaluation that will result in the most cost-efficient material to meet your needs.

There are a number of factors to consider when evaluating your application to answer whether there is really a need for silicone technology:

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Topics: silicone conformal coating, Conformal Coatings

The Importance of Air Quality in Conformal Coating Process

Posted by Rafael Hernandez on Sep 26, 2017 10:51:32 AM

One of the basic components used in most automatic or semi-automatic conformal coating processes is compressed air.  Pressurized air moves the liquid coating from the tank, through the hoses and the valves onto the PCB.  Since the pressurized air makes direct contact with the conformal coating, there are critical properties that must be taken into consideration, especially with moisture sensitive materials. What critical factors are important when working with UV40, UV500, 1A20 or any RTV Silicone from HumiSeal? 

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Topics: silicone conformal coating, Conformal Coatings

Easy Techniques to Abate Conformal Coating Wicking

Posted by Chase Corp Editor on Jan 11, 2017 12:24:26 PM

Have you ever experienced uncontrolled conformal coating migration?   Have you had to strip your recently coated boards because conformal coating wicked into non-desired keep out zones?   Wicking is a phenomenon caused by a combination of low surface tension coating, which is usually characterized by low viscosity, coupled with strong capillary forces generated by low standoff gaps possessed by the SMT process.   Wicking into connectors; onto grounding hole; or under sensitive components will create defects that will have to be reworked, as it may cause reliability concerns with the finished product, which we will describe in detail.   There are ways to either reduce and/or eliminate wicking issues through decisions made during preparation, application, and conformal coating selection.    

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Topics: silicone conformal coating, Electronic Protection, Conformal coating benefits, Wicking

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