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Date: | 13 Jun 1996 10:56:50 -0500 |
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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
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