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Nancy Golden
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Platinum
Re: Silicone Conformal Coatings
Nancy Golden   3/14/2013 2:19:31 PM
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That's great, Ann - I love the calendar. There are some great topics coming up!

Ann R. Thryft
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Blogger
Re: Silicone Conformal Coatings
Ann R. Thryft   3/14/2013 1:49:59 PM
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You're welcome, Nancy. You can access the DN editorial calendar here: http://www.designnews.com/document.asp?doc_id=208723

Nancy Golden
User Rank
Platinum
Re: Silicone Conformal Coatings
Nancy Golden   3/14/2013 12:19:15 PM
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Thanks for pointing that out, Ann. I am looking forward to reading more about it in May!

Ann R. Thryft
User Rank
Blogger
Re: Silicone Conformal Coatings
Ann R. Thryft   3/14/2013 12:01:35 PM
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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.

Nancy Golden
User Rank
Platinum
Re: Silicone Conformal Coatings
Nancy Golden   3/13/2013 5:46:25 PM
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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.

Ann R. Thryft
User Rank
Blogger
Re: Very Informative Article - showing SR may be best choice...
Ann R. Thryft   3/13/2013 5:23:08 PM
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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.

Nancy Golden
User Rank
Platinum
Re: Very Informative Article - showing SR may be best choice...
Nancy Golden   3/13/2013 4:55:06 PM
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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.

Ann R. Thryft
User Rank
Blogger
Re: Very Informative Article - showing SR may be best choice...
Ann R. Thryft   3/13/2013 4:47:46 PM
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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.

Ann R. Thryft
User Rank
Blogger
Re: Silicone Conformal Coatings
Ann R. Thryft   3/13/2013 12:53:29 PM
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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.

drsmith_m304
User Rank
Iron
Silicone Conformal Coatings
drsmith_m304   3/13/2013 11:41:10 AM
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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.

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