There is hope: 3 M is about to or has released a new material called 
Hydrofluoroether
 Some unique features claimed are:
          Runs in a conventional degreaser ( still need a free board on the 
degreaser)  Can be dipped or sprayed also.
          No Ozone depleting potential
          Nonflammable
          Density 1.5
          High thermal temperature stability
          No VOC emissions
          Cleans like the old now banned Freons
          Not a skin sensitizer
          Inhalation No observed effect at 10,000ppm
          Not an eye irritant
          Wide Range of material compatibility (except fluorocompounds)
     They are in Minnesota , it is the specialty chemicals group and the 
MSDS gives a phone number of 612-733-1000.  A Dr Richard Mindy there or 
Lester Sandy in Los Angeles can provide information 213-726-6438


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From: [log in to unmask]
To: [log in to unmask]
Subject: FAB: LPISM over Reflow Sn/Pb
Date: Thursday, June 13, 1996 9:34AM

     Problem: We phased out our last CFC-degreaser to help patch the 
              alleged ozone hole.
     Problem: We phased in Probimer 65M which ostensibly has slightly lower 
              adhesion than Probimer 52.
     Problem: curtain-coated S/M peeling from reflowed tin/lead         Our 
standard surface prep for SMOBC is pumice (no brushes) but pumice      dulls 
the reflow finish and has been rejected by the customer for      aesthetics 
in the past.  Customer is high-rel avionics and will likely      be a bit 
stubborn with design change recommendations.
     Does anyone have a successful pre-clean method for S/M over reflow?
        a conveyorized solder brite?
     a non-CFC degreaser?
     a solvent?
        Thanks in advance.
     Joe Felts
     PC World, Toronto