Military Standards for Safeguarding Printed Circuit Assemblies
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In HZO’s business of protecting electronics from environmental contamination, the MIL-SPEC we keep a close eye on is MIL-I-46058C, which is the specification that lists the technical criteria for conformal coatings along with the requisite quality assurance tests and their testing protocol. The HZO material is based on para-xylylene, a polymer serving as an insulator and protective barrier to safeguard printed circuit assemblies.
Although MIL-I-46058C was deemed inactive for new designs, this requires more explanation. Isn’t that always the case? MIL-I-46058C does not detail a workmanship standard, nor is it a definition of quality. Rather, the spec ensures that the tested material is suitable for use as a conformal coating for electronic assemblies. Even though deemed inactive, MIL-I-46058C remains the defining standard for companies who supply conformal coatings for two important reasons: it is the only published standard that includes a qualified product list used by the DOD and the standard also requires certification by an independent third party.
Like all things, MIL-SPEC is one part of the equation. When choosing a protective barrier, it all starts by defining requirements including the environments to which the electronic assembly will be subjected. That’s the best way to keep electronics safe from damage.
* Image Courtesy of Empfasis, a publication of the National Electronics COE. For more information about types and qualities of conformal coatings visit:
https://www.empf.org/empfasis/2009/may09/conformal.html
Ryan is a 9-year veteran to the world of protecting electronics from harsh environments and a lover of all things technology.
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