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 ---------- 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