I know the FR stands for Fire Resistant.  Not quite sure about the 4.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ezequiel Cruz
Sent: Wednesday, September 10, 2003 8:38 AM
To: [log in to unmask]
Subject: [TN] FR-4

Can anyone tell me what the FR-4 acronym stands for?
I know what the material is per IPC 4101, but what does the FR and the
number 4 stand for?

Thanks techies.

Ezequiel

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