Blog

Electric Vehicles: Polymers for Performance, Reliability, & Protection

Posted by Dan Griffin on Jul 30, 2020 1:00:00 PM

Adoption of plug in -electric vehicles (EVs) has been slower than many expected, but there is little question the next few years will see adoption accelerate. Your hypersensitive dog will have to find new visitors to harass when your delivery drivers arrive without notice, driving to your door silently in all-electric commercial vans. Many of your favorite suppliers and stores have already ordered these vehicles. Game-changing battery and charging developments are eliminating range anxiety, and autonomous driving controls and safety innovations are in the final stages of building our trust.

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Topics: Thermal Interface Materials, Vibration Suppression, Thermosink, Conformal coating benefits, EMI conductive gaskets, EV, Electric Vehicle

Protective Coatings and Polymers for Hydrogen Fuel Cell Electronics

Posted by Jacek Knop on Jun 30, 2020 2:45:04 PM

Modern hydrogen fuel cell technologies require ever more sophisticated and reliable electronic control systems to assure both safety and longevity. Hydrogen fuel cells are gaining in popularity in critical industries including automotive, aerospace, ocean transportation, military, and power microgrid systems among others. Protection of printed circuit boards and their components from physical, chemical, and thermal damage is essential to produce robust and reliable fuel cell systems for demanding applications.

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Topics: UV Curable (Type AR/UR), Conformal Coatings, Humiseal Blog, Conformal coating benefits, UV Curing, microgrids, renewable energy

How to Calculate the Cost of Conformal Coating on a PCB?

Posted by Dan Griffin on Apr 16, 2020 11:00:00 AM

One of the most basic and common questions we at HumiSeal® are asked by both existing and potential new customers is,

“How much does it cost to conformally coat my printed circuit boards?”

Since conformal coatings are usually sold in liquid form by the liter or gallon, it is necessary to go through a fairly basic calculation that we will present here.

The simplest and most common way to evaluate cost is by determining the cost in dollars of coating per PCB.

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Topics: Conformal Coatings, Conformal Coating Costs, Protection for PCB

Understanding the Importance of the Moisture Vapor Transmission Rate of Conformal Coatings

Posted by Dan Griffin on Mar 25, 2020 10:00:00 AM

A critical function of conformal coatings is to protect PCBs and electronics from damage caused by moisture and humidity. In this discussion, we will attempt to answer some of the more common questions we often hear regarding the level of protection you can expect from a conformal coating.

Are conformal coatings waterproof?

The above is probably the most common question and most misunderstood subject in the area of PCB protection

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Topics: Environmental Conditions, Conformal Coating Process, Conformal coating benefits, waterproofing silicones, waterproofing

What is PCB Surface Energy and How Does It Affect Conformal Coating

Posted by Dan Griffin on Feb 24, 2020 10:15:00 AM

In previous articles, we discussed common defects in conformal coatings related to surface energy issues. These included issues such as

  • fish eyes
  • lack of coating coverage
  • poor bonding
  • delamination

We received significant feedback, and the most common response was to ask for more specifics about just what surface energy is anyway.

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The Potential Cost of NOT Conformal Coating Your PCB

Posted by Dan Griffin on Jan 23, 2020 10:00:00 AM

The PCB industry continues to evolve with ever increasing demands for efficiency and manufacturing cost reductions. From the design phase onward, suppliers and contract manufacturers are being asked by their OEM overlords for increased performance at lower and lower costs. An obvious potential source for cost reduction is the use of alternative cheaper raw materials or their elimination where possible. At some point in the discussion, it is sometimes asked,  “Why don’t we just eliminate the conformal coating?” or "Are conformal coatings necessary".

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Topics: conformal coating application, Conformal Coating Costs, Conformal coating benefits, Protection for PCB

Protective Gels: The Next Level of Protection for Your PCBs

Posted by Dan Griffin on Dec 16, 2019 9:57:33 AM

Conformal coating of printed circuit boards (PCBs) has resulted in a steady evolution in performance and protection for modern electronics. It has allowed for lightweight and reliable controls in industries such as automotive and aerospace among others. This has brought about the possibility of increased length of warranties as well as fewer failures and claims. Nevertheless, original equipment manufacturers (OEMs) and consumers continue to raise their standards and expectations for longevity and reliability to levels unimagined just 10 years ago. In the automotive industry, as an example, thermal cycling testing might have involved as few as 10 or 50 cycles in the recent past. That standard is now often 500 or even 1000 cycles with no apparent ending in sight.

So what do I do when conformal coating is not enough?

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Topics: Conformal Coatings, Protection for PCB, Protective Gels

Masking Before Conformal Coating My PCB: What Are My Options?

Posted by Dan Griffin on Nov 14, 2019 12:41:19 PM

Nobody likes masking, nevertheless it can be a necessary part of your PCB production process.

“But I thought selective conformal coating equipment had eliminated the need for masking in most cases.”

The cost of selective conformal coating equipment can easily run into the hundreds of thousands of dollars. Even those who invest in the latest selective coating technology find, at times, that masking in certain areas is the only solution.

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Topics: Conformal Coatings, Masking

Thinners for Conformal Coatings: The Basics of What, When, and How

Posted by Dan Griffin on Oct 31, 2019 10:30:00 AM

You have completed your search for an ideal conformal coating chemistry, one that will provide your PCBs the protection and reliability demanded by your industry and customers. After all that work, you probably assume your job is finished. Our apologies for being the bearer of bad news: There is still work to be done. In this basic presentation and discussion, we will talk about the proper choice and implementation of thinners for your coating. In many cases, a mistake in thinner can harm or even completely negate the protective properties of your conformal coating when applied to your PCB.

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Topics: thinners, Conformal coating benefits

How to Avoid Orange Peel Appearance in Your Conformal Coating

Posted by HumiSeal Editor on Oct 21, 2019 9:00:00 AM

Have you ever seen your conformal coating look like the pictures above? It is a fairly common report to our technical support group. The appearance is often described as “orange peel” or sometimes “alligator skin.” We would like to offer you a basic explanation of this phenomenon, along with some simple approaches to avoid its occurrence or eliminate it when it appears.

What is orange peel and what is the cause?

In our experience, the uneven appearance that looks like the surface of your garden variety orange is almost always the result of exposing the coating to heat and airflow too quickly.

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Topics: Conformal Coatings, Orange Peel