Removing the coating is not just potentially important in repairs, but it's essential for Design For Disassembly/Design For Recycling practices. Our upcoming May materials feature article addresses some DFD/DFR topics along these lines.
I'm just wondering how important it is to be able to remove the coating, drsmith... We used to have the mindset of repairing a product at board level, then we started board swapping, and now we don't even bother to do that in many cases...our it's broke - throw it away mentality may preclude the need for being able to access the board and if the coating is doing its job - I am thinking that the need for repairs should go down.
You're right about that, of course. Both that I didn't get to take advantage of volume pricing, and the effects of the Walmartization of America. Personally, I don't shop there as my own form of boycotting. The practice of only caring about large numbers especially burns me living in a low-population density area where the whole point is individualized tastes and service--or it should be. Instead, I'm told that YXZ product has disappeared from my local store because volumes aren't high enough. Those practices may work, and make sense, in NYC, but not in a small town of 4000 or 6000 people.
Having run a small business Ann, I am sure you did not get to take advantage of volume pricing like Walmart. That is what is running the Mom and Pop shops out of business and it's a shame - usually the quality is so much better since they take personal pride in their product. What was really frustrating is that we chose the better material, knowing we wouldn't be able to compete but refusing to compromise. Unfortunately initial cost will often call the shots even when it makes sense to do otherwise...and if you don't let it, you'll fail because you can't be profitable.
Nancy, I know what you mean. Seems like that subject--engineers want a better product/component/material, but management/beancounters won't go for the slightly higher cost--comes up a lot in the comment boards. But your point about smaller companies buying smaller quantities is a good one, too. I know that from having run a small business for several years.
Thanks for the feedback drsmith. Interesting points about the difficulty of silicone removability, since one of the supposed pluses of silicone coatings is it good adherence to typical board substrate materials. OTOH, Design For Disassembly/Recycling are not yet established best practices everywhere. Stay tuned--our upcoming May materials feature article addresses some DFD/R topics.
If boards are ever to be repaired, or parts replaced, the coatings have to be removed. With Acrylic or Polyurethanes removal is relatively easy, so the repair is easy. However, silicone coatings are a different story. From the HumiSeal website:
Silicone - This is the most difficult coating to remove and the coating least compatible with all of the other coating types. There are no solvents to remove silicone so it may only be removed by abrasion and this will leave silicone contamination on the board surface. Complete removal is virtually impossible so local repair is generally all that is attempted.
Also, companies that outsource their board manufacturing typically lose their PCBA fabrication kowledge over the years (if they had any to begin with) and are constrained to initially judge coatings based only on their manufacturing costs, which include the material cost and the extra time, equipment and labor to cure the coating. Surprisingly, some of the most popular non-USA Contract Manufactures have little if any experience with coating, coating chemistry or coating processes - so these CM can offer virtually no well considered advice on coatings. Bean counters ask "Which is the cheapest and easiest to apply?" and the answer is usually "Acrylic" due to the similarity with ordinary acrylic spray paints.
“How can European standards affect me, especially since I only use machines built in the US?” This is a common question, and one way to answer this is to look at how machine safety is enforced, where the information comes from, and how well you can prove you followed the regulations.
In order to keep in line with safety protocols, industrial networks need to be filtered in a semantic way so that only information related to diagnostics is flowing back to the vendor and that any communications that could be used for remote machine operations are suppressed.
While people may talk about the procurement process, the procurement discipline actually encompasses a number of different processes. They include spend analysis, supplier relationship management, and contract management, just to name a few.
As the Industrial Internet of Things and machine-to-machine communications movements gain speed, some companies are asking themselves, “Wait. How much information do we really want to flow in and out of our premises? Aren’t we supposed to be doubling down on cyber security?”
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.