I've had trouble with bloating using Standard 266. I know I'm not the first person to have this issue, but my options for preventing it are limited. I fire my pots in a community studio, so can't change the firing schedule (we bisque to cone 06 and glaze fire to cone 6, both in an electric kiln). Is it reasonable to assume that putting a piece through the bisque again will burn out the remaining organic matter, and therefore prevent bloating? I don't know the exact bisque firing schedule, but it
Callie and timbo pretty much have it, but I wanted to add a few more thoughts.
As identified, the two main causes of bloating are
1) insufficient burnout of organic materials in the clay, (I will come back to this below), and
2) metals in the clay which will not burn out at any temperature. These metals are mostly harmless at standard bisque temps, but at the higher temps experienced during the glaze firing these metals can melt and form gaseous pockets in the clay.