devitrification on bottles

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  • #9668
    kpearman
    Participant

    Some bottles I flatten have devitrification especially the blue ones. I usually heat the bottle to 1325 for 30 minutes. I have tried hotter temps for shorter periods but still get the same devitrification. I tried a borax solution but this did not help – in fact it became worse. Any good solutions?

    Thanks.

    Keith

    #12204
    Stephen Richard
    Participant

    720C is right in the middle of the devitrification zone, so soaking for 30 minutes there is not a good idea. Try a long soak at ca. 677C or a quick one at 760C.  But the main thing is to have every thing very clean.  Contaminated surfaces, even if only a little, on bottles and float glass lead to devit very easily.

    Stephen Richard

    blogs at: http://www.verrier-glass.blogspot.com/ and  http://www.glasstips.blogspot.com/

    #12205
    kpearman
    Participant

    I usually clean with isopropal alcohol. Is there something better?

    Keith

    #12206
    Stephen Richard
    Participant

    If you have water without lots of minerals in it use it.  Otherwise do the final rinse with distilled water and polish dry.  But you will still have a portion of the bottles devitrifying – it seems to be tne nature of bottles.

    Stephen Richard

    blogs at: http://www.verrier-glass.blogspot.com/ and  http://www.glasstips.blogspot.com/

    #12207
    Anonymous
    Inactive

    Isopropal alcohol comes in different concentrations – typically 70% and 91%.  Use the 91% (most pharmacies carry it – and it doesn’t cost a lot more).  The non-alchohol portion can contain oils that don’t help.

    As Richard suggests, buff your glass clean as a last step.  Use a clean, cotton rag.  Make sure it wasn’t dried using dryer sheets – they leave residue in the fabric that transfers to the glass.



    Paul
    FusedGlass.Org
    Helios Kiln Glass Studio
    PaulTarlow.com

     

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