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decap:epoxy_acid

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decap:epoxy_acid [2023/11/18 11:49] – [References] philpemdecap:epoxy_acid [2025/02/03 06:42] (current) – [Rosin] mcmaster
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-====== H2SO4 + FNA ======+===== H2SO4 + FNA =====
  
 {{:decap:hno3_h2so4_swollen.jpg?300|}} {{:decap:hno3_h2so4_swollen.jpg?300|}}
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 WARNING WARNING WARNING: this is very dangerous.  The mixture will instantly explode upon contact with many organics.  Not recommended, was more of a curiosity.  In short, a mix of these two will decap a chip much faster.  At room temperature the sample chip swelled up in addition to dissolving.  See [[http://uvicrec.blogspot.com/2012/06/cold-nitric-acid-experiments.html|Cold nitric acid experiments]] for details. WARNING WARNING WARNING: this is very dangerous.  The mixture will instantly explode upon contact with many organics.  Not recommended, was more of a curiosity.  In short, a mix of these two will decap a chip much faster.  At room temperature the sample chip swelled up in addition to dissolving.  See [[http://uvicrec.blogspot.com/2012/06/cold-nitric-acid-experiments.html|Cold nitric acid experiments]] for details.
  
 +
 +===== Drain Pipe Opener =====
 +
 +Some strong drain pipe openers are essentially Piranha solutions. Based on my experiments, this solution has worked great for most epoxy packages. It is also very easy to obtain in many countries and regions without any regulation, making it a good alternative to sulfuric acid. 
 +
 +That said, it's just as dangerous as concentrated sulfuric acid, so it should be treated with extreme caution and protection of PPEs.
 +
 +The only downside is that it eats away metal and bonding wires.
 +
 +Drop the chip in a beaker and submerge it in the solution. Heat the solution to boiling (warning: intense smoking will occur), and wait about 1.5 hours until the die is fully exposed.
 +
 +My personal recommendation is the Black Swan "Zap" 51996 Sulfuric Drain Opener, but similar-looking drain pipe openers should have the same ingredients.
 +
 +{{:decap:epoxy:pipe_opener_zap.jpg?100}} {{:decap:epoxy:pipe_opener_result.jpg?300}}
  
  
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 ====== Rosin ======  ====== Rosin ====== 
 +
 +https://ic.onidev.fr/en/die/rosin_decap.html
 +
 Boil a chip for a few hours in rosin, like used for soldering. Refluxing equipment is ideal. Should eat away the casing. Might be best used with Dremeling or other techniques to remove the majority of the epoxy first. The active ingredient for this is abietic acid. Boil a chip for a few hours in rosin, like used for soldering. Refluxing equipment is ideal. Should eat away the casing. Might be best used with Dremeling or other techniques to remove the majority of the epoxy first. The active ingredient for this is abietic acid.
  
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 There's a fine line between laziness and efficiency. I don't judge. There's a fine line between laziness and efficiency. I don't judge.
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 ====== References ====== ====== References ======
decap/epoxy_acid.1700308184.txt.gz · Last modified: 2023/11/18 11:49 by philpem