Why use slow bisque over fast bisque? Is it just a moisture issue?

  1. Slow bisque is the safest to use and ensures a better firing to get out fumes and water vapors.
  2. The more carbonaceous materials you oxidize during the bisque firing the less potential you have for outgassing during your glaze which will cause pitting in your glazes.
  3. For very thin work or for certain clays you can use the Fast Bisque - or if it just works fine for you. Start with Slow Bisque and experiment later.
  4. Remember: Heat-work is always a function of time and temperature. You achieve the same cone firing if you fire slower for a longer time to a lower temperature.
  5. See this post for an even slower bisque program to use if the standard SLOW BISQUE Easy-Fire program does not work for you.