Don't laminate it at all, The thickness you have designated is typical 
     for conformal coating. This has the added benefit of insulating all of 
     the plated through solder joints.


______________________________ Reply Separator _________________________________
Subject: Insulating layer
Author:  [log in to unmask] at internet
Date:    11/1/96 9:42 AM


     Anyone,
     
     We have an application on a 2 layer board with through hole 
     technology which requires an insulating material 
     laminated/applied to one surface/side. Initially we thought 
     of having a prepreg material laminated to one surface but are 
     unsure if this is the most cost effective method. Anyone out 
     there who knows of a method or material which would support 
     this requirement please respond.
     Some of our requirements are;
     
     1. Must be a UL recognized material
     
     2. Must provide at least 500V of dielectric insulation
     
     3. Would preferably be thin, .001-.003 thick.
     
     Some questions we have are;
     
     1. What type of relief would be needed around PTH?
     
     2. How thick would the material need to be?
     
     3. Who is doing this type of fabrication today?
     
     4. Can it be applied selectively?
     
     5. What is the typical cost impact to a double sided board?
     
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