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RE: [teacherartexchange] Glaze Firing with Cracking

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From: San D Hasselman (shasselman_at_TeacherArtExchange)
Date: Fri Oct 10 2008 - 15:24:22 PDT

Cracking is usually caused by quick cooling. Did you crack the top of your kiln open with a stilt and let it cool down slowly?

San D

>
> I just did a glaze firing and I experienced a tile project that cracked and
> one that broke in half. I have the option on my kiln to do a fast glaze - 5
> hours or a slow glaze cycle - about 7 hours. My thought is that the
> fast glaze heated up to fast and caused the cracking. Does anyone have some
> thoughts of why this happened?
> 

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