Bubble Squeeze in TAC firing schedule

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    I have just made a tile using two 8″ pieces of thin black 96 glass.. I used these as a base for a decorating layer using white pieces. This was a flower using many small pieces covering about a thilrd of the base. I used The TAC pre-programmed  schedule on my Deluxe 15-6 Kiln to fire it.

    When fired, the black background has many small indentations – not really like bubbles- but maybe they are really air caught inbetween the layers. Maybe  I should have added a bubble squeeze?

    The schedule was

    300 F/hour            1250F            .30

    400 F/hour 1310F            .10

    FULL                     960F            1.00

    100F/hour               800F              .00

    Where and how long should the bubble squeeze be?

    Could there be another reason for this problem?





    Look at the bottom of this page for good info on a bubble squeeze.


    Dana W.

    Jester’s Baubles Fused Glass Designs


    Stephen Richard

    If you are firing Spectrum S96, even at 677C you are not really getting a proper tack fuse with only 30mins at the temperature.  The bumps and indentations are probably a result of an incomplete adhesion of the glasses.  Tack fuses normally occur in the 720-760C range.

    Don’t rely on the pre-programmed schedules.  Instead look at some of Paul’s here on the site.

    Stephen Richard

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

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