A question was received from an IPC member contemplating installation of 
new clean rooms.  As there is a significant expense difference between 
one particle count class and another, the member asks:

  The basic question is how clean is clean enough for the imaging area?  
  Is there any available data indicating the correlaiton between particle 
  count in the image area and image defect rates?

Please forward any responses to my attention.

Thanks
***************************************************
David W. Bergman, Technical Director
IPC
7380 N. Lincoln Avenue
Lincolnwood, IL  60646
708-677-2850 x340 Phone
708-677-9570 Fax
email  [log in to unmask]
***************************************************