Liquid Tin before drilling or after?

Discussion in 'General Electronics Chat' started by spinnaker, Nov 14, 2010.

  1. spinnaker

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    I am about to use Liquid Tin for the first time. Yes I intend to take proper precautions. Should I Liquid Tin before I drill my holes or after?
     
  2. beenthere

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    Apr 20, 2004
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    Before - when you handle the board, the copper is exposed to the nasty on your fingertips otherwise.

    Precautions? Just don't drink it.
     
  3. spinnaker

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    Rubber gloves right? Is it safe to use indoors w/o proper ventilation?
     
  4. Kermit2

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    tin is pretty harmless, zinc, copper, lead, cadmium, antimony, chromium, and a few others are toxic. Zinc is sneaky, in that you can be exposed several times and not notice any problem or even that you were exposed, but then upon the N-th exposure you get sick almost immediately and from then on, with every exposure. Big problem with brass casting profession in the day.
     
  5. jpanhalt

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    @Kermit2
    I believe the concern is not over metallic tin that is deposited on the copper. It is over the chemicals, including various salts of tin, that are included in the preparation to make the conversion coating work.

    John
     
  6. Kermit2

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    Old school delirium here. not a big solder pot of melted tin, just some stannous sulfate or something right?
     
  7. jpanhalt

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    I have no idea what you mean.

    "Liquid Tin" is not stannous sulfate. It is tin (II) (stannous) fluoroborate and fluoroboric acid plus thiourea, based on its MSDS. The older Tinnit is apparently no longer made, but was not based on fluoroborate, as I recall. It was a dry solid. I could not find and MSDS for it.

    John
     
  8. thatoneguy

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    Is TINNIT what you are using, or something else?
     
  9. spinnaker

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    The actual name of the product I am using is Liquid Tin but it looks like this is a better deal thanks.

    I got mixed results on my first run. Probably my fault. Maybe I did not clean the board good enough.
     
  10. jbeng

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    Sep 10, 2006
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    Try this link for an MSDS...
     
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