Homebrew PCBs

Thanks for the suggestion(s) for determining copper weight of some 
copper clad material.  I'll see if the old micrometer can tell me 
something.  All three suggestions were to peel a little piece of the 
foil and measure it.

I wonder if another simple method might be to measure overall thickness 
of unetched material and then subtracting the resultant thickness of 
totally etched (no copper left) material.  (Take into account single or 
double sided.)

I didn't easily find a reference to "ounces versus thickness", so for 
anyone looking, this website has a nice chart:

http://www.standardpc.com/laminates.htm

or here is the info:

1/2 oz.    18 um     0.7 mil
1 oz.      35 um     1.4 mil
2 oz.      70 um     2.8 mil
3 oz.     105 um     4.2 mil

For various thickness of materials, here's the mm to mil conversions:

0.4 mm      16 mil
0.6 mm      24 mil
0.8 mm      32 mil
1.0 mm      40 mil
1.2 mm      47 mil
1.6 mm      63 mil

(OK, no quibbling over round offs!)

If anyone finds a neater form, let me know.  I did spend a lot of time 
looking at this groups resources online and may have overlooked this 
information.

Regards,
Don