It the material BT/Epoxy or real "straight stuff" BT 
        (Like Mitsubishi)?
        They process differently.
        DHH
______________________________ Reply Separator _________________________________
Subject: BT desmear
Author:  [log in to unmask] at SMTPLINK-HADCO
Date:    2/28/96 6:10 PM


Does anyone have information concerning 
desmear requirements for BT laminate 
material. Is plasma the only system
available ?  To what degree does BT
smear in the first place, some chemical 
suppliers have stated that BT does not 
smear. There seems to be consensus from 
chemical suppliers that permanganate 
does not significantly attack BT, but 
of the many board fabricators poled, 
most use a modified permanganate cycle 
for desmear.
     
Any information about this would be
appreciated.
     
     thank you,