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???
09/28/06 03:46
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 		 #125244 - Formic acid doesn't work for me!
Responding to: ???'s previous message
Steve said:
If the case is epoxy, Formic acid will etch it.

I have made some tests with 85% formic acid, already. Unfortunately, it doesn't work for me at all! As if I would take clear water...

Kai

List of 45 messages in thread
TopicAuthorDate
How to remove the stamp from chip package?            01/01/70 00:00      
   paint the chip            01/01/70 00:00      
      Can be removed?            01/01/70 00:00      
         I am afraid...            01/01/70 00:00      
            more ideas            01/01/70 00:00      
               Yes, but...            01/01/70 00:00      
                  let me elaborate on the idea...            01/01/70 00:00      
            If its a ceramic package            01/01/70 00:00      
               Thanks            01/01/70 00:00      
            Yes..            01/01/70 00:00      
               epoxy            01/01/70 00:00      
                  Thanks!            01/01/70 00:00      
                     ESD and bead blasting            01/01/70 00:00      
                        Chips are already soldered onto the board            01/01/70 00:00      
                           Not BGA            01/01/70 00:00      
                              Thanks, Joseph!            01/01/70 00:00      
                  Formic acid doesn't work for me!            01/01/70 00:00      
               epoxy or novalac            01/01/70 00:00      
                  Yes, high tech epoxy...            01/01/70 00:00      
         some paint works            01/01/70 00:00      
            Yes, that's what I'm looking for!            01/01/70 00:00      
   Stamp?            01/01/70 00:00      
      marking            01/01/70 00:00      
      The printing on the package, the marking            01/01/70 00:00      
         Sand paper, cloth emery sheet            01/01/70 00:00      
            Thanks            01/01/70 00:00      
               How about very fine grit emery cloth damp or wet?            01/01/70 00:00      
                  Yes, this is a good idea!            01/01/70 00:00      
                     Methy-Ethyl Ketone Peroxide?            01/01/70 00:00      
                        Plastic            01/01/70 00:00      
                        MEKP            01/01/70 00:00      
   I remember that situation ...            01/01/70 00:00      
      abrasive and ESD            01/01/70 00:00      
      back in the old days ...            01/01/70 00:00      
         I may be being stupid but...            01/01/70 00:00      
            there are reasons ...            01/01/70 00:00      
               Always a pleasure            01/01/70 00:00      
         While in memory lane...            01/01/70 00:00      
            We did that at IBM, too.            01/01/70 00:00      
            Special companies do it            01/01/70 00:00      
               You can get stock numbers on anything            01/01/70 00:00      
   Use a Dremel            01/01/70 00:00      
      It's important they don't notice it!            01/01/70 00:00      
         It didn't blister            01/01/70 00:00      
      I will have a look at it            01/01/70 00:00      

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