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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