Cracked Kiln Shelf

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  • #9691
    Saturations
    Participant

    I recently did a long thick pot melt with great success on the glass, but my shelf cracked during cool down.  any idea why that would be??

    #12255
    Anonymous
    Inactive

    Sorry to hear that.

    If none of the glass stuck to the shelf it was probably thermal shock.

    What kind of kiln and what was the schedule?



    Paul
    FusedGlass.Org
    Helios Kiln Glass Studio
    PaulTarlow.com

     

    #12256
    Saturations
    Participant

    1000 1000 15 min

    250 1100 15 min

    1000 1700 90 min

    9999 1500 45 min

    9999 950 180 min

    12 800 15 min

    24 700 10 min

    120 100 0 min

     

    #12257
    Anonymous
    Inactive

    A couple more questions:

    1) Did the glass break too – or just the kiln shelf?

    2) How do you know it broke on the way down?

    3) Were you firing right on the shelf – or fiber board/fiber paper?

    Paul



    Paul
    FusedGlass.Org
    Helios Kiln Glass Studio
    PaulTarlow.com

     

    #12258
    Saturations
    Participant


    The glass did not have any sign of the cracked shelf under it – no creases etc. I was using shelf paper 1/16″ under the glass and around the stainless molds. I assume it cracked on the way down because there was no healed marks on the bottom of the glass. I did discover a crack forming on the 6×6 piece but not the other one after a few days.

    I may have been aggressive taking the glass out of the the stainless dam (which I did in the kiln and on the shelf).

    The shelf was thinner than most (I got it second hand – made in taiwan with riddges on the bottom).

    #12259
    bhawbaker
    Participant

    Same thing happened to me doing the kiln pressed glass project.  I normally have the shelf on 1/2 inch posts to even the heating, and I should have put the shelf directly on the kiln floor.

     

    But all is not lost!  I just cut up the broken shelf with a tile saw (using the tile blade) into 1″ strips to use as dams, holders for screen melts, etc.

     

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