Printed circuit board insulation class

Thread Starter

bluestreakG1

Joined Aug 22, 2017
19
Hello. What is the meaning of insulation class for printed circuit board like Class 4 as in the attachment that I enclose? What is insulation classification for printed circuit board?

Thank you.
 

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I'm also not sure what they are referring to. My best guess is the FR (Flame Retardent) rating of the laminate (could be referred to as the insulation I guess?), FR-1, FR-2, FR-3 and FR-4. Almost all boards now are FR-4.
 
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