Erine, It was probably a Silicon rubber mat (typically reddish in color) which can withstand high temperatures and not Silicone. Silicon rubber typically should not pose a problem and the UR peeling is probably from a different source. Regards, Bruce Misner > ---------- > From: Ernie Crump[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum.;Ernie Crump > 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. 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