Mitch Morey wrote:
> 
> Help.
> 
> How do I call out 1/2oz Copper per MIL-P-13949? I know it's C1/C1 for 1oz
> over 1 oz. What's 1/2?
> 
> Thanks,
> 
> Mitch Morey

Mitch,
this is how we specify our copper:

------------------------------------------------------
Laminate shall be in accordance with MIL-S-13949/H.
Copper weight is  1  oz./sq. ft. internal and  1/2  oz./sq. ft.
external. Final composite thickness will be  .062" +/- .004".
Typical material specification, as per ANSI/IPC-D-275,
is Type GFN-0620-CH/CH-B1B where:

GFN	= FR4 glass fabric impregnated with flame retardant epoxy resin
0620	= nominal dielectric base thickness (ten-thousandths of an inch)
CH	= top side, metallic foil type and nominal weight (ounce/sq. ft.)
CH	= bottom side, metallic foil type and nominal weight (ounce/sq.ft.)
B	= laminate quality (pits and dents per sq. in.)
1	= thickness tolerance
B	= laminate material bow and twist
------------------------------------------------------

I hope this helps.
Ciao!
Eric Bonatti
PCB Design
GN Nettest, Datacom division
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