Dow Corning offers a "silicone Cleaner and Surface Prep Solvent" called
OS-2.  Haven't tried it, though.  If you do, please let me know how it
works.

Thanks,
Jim M.


        -----Original Message-----
        From:   Ernie Crump [SMTP:[log in to unmask]]
        Sent:   Tuesday, October 31, 2000 2:59 PM
        To:     [log in to unmask]
        Subject:        [TN] Silicone

        We have had a vendor use a silicone rubber mat on his platen while
bonding a
        heatsink to a polymide pwb, and we suspect that the silicone has
become part of
        the pwb surface on the one side, as the UR coating process has
produced
        fisheyes, and peelable coating, just on the one side.
        We use Bioact-7R, alcohol and then di water to clean in a proper
monitored pwb
        washer, but the removal of silicone is very difficult.
        What cleaners are recommended for removing it, without destroying
components, or
        leaching under the bonded heatsink?
        Thank you.  Ernie Crump   Raytheon Systems Canada.
        Phone 519-885-0110,     fax. 519-885-1178


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