Caustic soda.

  1. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    I have a question about hot caustic soda.



    Simply put.

    I want to remove paint and crud from a metal lantern.



    But there is a sheet of 3mm glass I can not remove, yet.



    If I place the lantern into the hot caustic, will it affect the glass?
     
  2. rtbcomp

    rtbcomp Moderator Staff Member

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    Don't know about the glass, but make sure the metal isn't aluminum.

    Personally I'd be looking to getting some methylene chloride base paint stripper.
     
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  3. Tinbasherdan

    Tinbasherdan Bodger in chief

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    I’d take it to your friendly , local soda blasters myself
     
  4. hotponyshoes Member

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    Try chucking an old jam jar or something in first and see what happens?
     
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  5. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    All steel.
    But bady restored, that's why I want to remove paint before I rebuild/restore it.
     
  6. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    I will have to part with your money.
     
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  7. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    Like that idea.

    I have some old and new glass I could try.
     
  8. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    Beside there are a few blind areas I need to remove paint before I de rust with citric acid.
     
  9. More Amps Member

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    107
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    Scottish borders
    Caustic soda will not affect glass - unless its been stained or painted after manufacture.
     
  10. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    DSCN0196.JPG


    Well it seams to be working.
     
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  11. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    DSCN0202.JPG

    It worked.

    150g to 5lts of water and heated to 40Deg C.
     
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  12. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    DSCN0209.JPG

    Finished.
    Same mix, cooler temp through.

    After the first attempt I used a "Scotch-Brite" pad to remove the loose and crinkled paint. The soot was stubborn, but a filr card had to gone.

    Round two. Had all the remaining paint gone. Again a "Scoych_brite" pad was used to get into all the nooks.

    Then it was dried using a Hot air gun. That drone all moisture from the folds. Plus some old fuel.

    It has been given a coat of primmer to keep rust at bay.
     
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  13. Maker

    Maker nEw mEmBeR

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    Sodium hydroxide won't touch glass unless it's molten, at around 320 degrees.
     
  14. slim_boy_fat

    slim_boy_fat Forum Supporter

    Amazing turn-round there, fella!! :thumbup:
     
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  15. 123hotchef Member

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    Kent
    looks sweet
     
  16. The_Yellow_Ardvark

    The_Yellow_Ardvark If in doubt ask. Same rules for everyone

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    Thanks guys.
     
  17. Munkul Member

    Messages:
    778
    Cumbria, UK
    nice work!

    This. We use a lot of caustic soda in processes at work, up to 46% IIRC, hot, and all the tanks used to have level sightglasses on - just regular glass is fine. We had a devil of a job trying to replace them with non-glass ones though - the plastic kept turning milky.
     
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