HI LYN,

THE PROBLEM OF HEATING UP THE BOARDS AND SUBSEQUENTLY PHYSICALLY LIFTING
OFF THE EPOXY SM, IS ONE SIMPLY OF COST. TWO HUNDRED BOARDS BECOMES VERY
TIME CONSUMING TO PROCESS IN THAT MANNER, AND THAT MAY ONLY BE PROTOTYPES.
YOU, HOWEVER, DESCRIBED THE ONLY POSSIBLE METHOD FOR STRIPPING THE EPOXY
SM.

LENNY KURUP
[log in to unmask]

On Mon, 16 Jun 1997, Lynch, Lyn wrote:

> 
>      TechNet,
>      In a past life, while dealing with expensive Mil
>      boards, I have removed epoxy based masks using heat
>      and a sharp, flat wooden spatula.
>      
>      The trick here is to closely control the amount of heat
>      applied to the board. With practice and experience
>      you can raise the temperature of the board to above
>      the Tg of the mask but below the Tg of the butter coat
>      and carefully scrape the mask off the board, working with 
>      small areas and not rushing the process.
>      
>      It does take patience and practice, there is risk of damage
>      to the board, but it can be done.
>      
>      The views expressed here are not necessarily those of my 
>      employer.
>      
>      Lyn R. Lynch
>      Coates ASI
>      
>      
> 
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