I am posting this ? for a colleague:



"We are fabricating some boards for a customer that will be 1 oz of copper
on Duroid 6010.  They are considering two surface finishes:  HASL (Hot Air
Levelled Solder) and 150u" Nickel under 5-10 u" Gold.



The question they are asking is as follows:  What are the dielectric
properities of the Nickel/Gold finish vs. those of the HASL finish.



Does anyone know the answer?  I figured that the insulating material (the
Duriod) and the conductor thickness (copper) would have the largest
influence on dielectric performance and that the surface finish would have a
negligible impact on performance.  Is this true?"



Thanks!








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