I was asked to informally survey PCB shops as to how they control 
things like temperature, humidity, particulate count, general 
housekeeping (ie. visible accumulation of dust) etc. in various parts 
of thier operation.  The idea is that we potentially upgrading our 
facility and want to get an idea of what is felt necessary for yeild 
purposes out in Industry.  We're a relatively small volume, high mix 
shop (captive house) looking at production capabilities in the 5mil 
lines/spaces range.

The areas of interest are: Photo & Shop Check; Layup; Lamination; and 
Plating/chemical processing.  

Any guidance/comments would be appreciated.

Thanks,

Jim Maguire
Principal Engineer, E/E M&P
Boeing Defense & Space Group
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