Bromine is used as a fire retardant in laminates. If the FR4 material is
94-V-0, it is almost sure that bromine is used.

Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]

-----Original Message-----
From: Anil Kher [mailto:[log in to unmask]]

While measuring Gold plating thickness on FR-4 material - Bromine correction
is used - this ends up with lower than actual thickness in our case - Why is
this done and is Bromine a neccessary component of all FR-4 laminates?
Please reply earliest as my Gold plate thickness of 0.5 mic is measuring
same on Fundamental Parameters but as low as 0.3 microns with Bromine
correction and my customer is pissing mad

Anil Kher

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