I would suggest using a board house that has a standard finish of LPI mask.
 Our standard finish is LPI over bare copper, so there is no extra cost
associated with this product/finish.  There are probably some other shops
out there that provide the same.

Vera Payne
Graphic Electronics Inc.
Tulsa, Ok
918-835-4417

> From: [log in to unmask]
> To: [log in to unmask]
> Subject: Unidentified subject!
> Date: Monday, November 18, 1996 2:00 PM
> 
> We recently completed a single sided FR-4 design with a large area that
we
> "poured" copper into.  Two of our three high volume board shops said no
> problem when they reviewd this design. However our third house said that
it
> there is a possibility of a problem because we use a screenable solder
mask
> and they have a worry about possible flaking of the mask on the large
copper
> area.  They recommended two ideads:
> 
>         1.  Hatch the copper pour instead of leaving it solid.
>         
> Our answer to this? (Ameritech Commercial guy) ....MMMMM.......NO.  We
need
> it there for RF and ESD reasons I can't discuss.
> 
>         2.  Hatch the solder mask every 1/8 of an inch.
> 
> Again our answer to this is .....MMMMMM.......No.  This would gobble
solder
> out of our wave machines for no good reason.
> 
> So we said how about LPI and they said sure for a significant price
> increase.  Out of the three board houses this is the one who always gives
us
> the best product at the cheapest price with the least amount of rejects.
> 
> SO WHAT DO WE DO NOW ?  We want to continue to use the solid copper pour
> feature on future products.
> 
> Your thoughts would be appreciated.
> 
>
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