Type of FR4 Board

[vick5821]

Hey guys,

I realised there are different type of FR4 Board available like for example XB, DS....

However, I cant able to search for the difference between them.

Anyone knows about that ?

Thank you

 

[CocaCola]

Where are you seeing these additional designations? FR = Flame Resistant, the 4 = epoxy fiberglass substrate...

There are a few other designations like military grade stamps, but I have not seen this CB. DS rating? Possibly an in house rating for board thickness and copper pour?