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Firing Log



The following blank firing log can be copied for your own use. It will help you repeat good performances and avoid disastrous results.

As you experiment with glass fusing, keep a log of all of your transactions. Keep your log near your kiln with a pen or pencil so that you can write down what moves you made and how your glass reacted.

Every kiln is unique and different. Your electrical current loads might not be the same as someone else's, and your pyrometer can be off slightly or a lot.

It is suggested that you keep written records of all your fusing and slumping firings. You will want to write down what is being fired, the date and times of firings, type of glass used, your heating and cooling temperatures and times, if you used a switch or controller and what were the settings, the venting and the final results.

firing log



This schedule should help you determine future firing times and temperatures. It will assist you in determining:

  • How to plan your schedule and what the ramps and holds were for this project.

  • Estimate how long each firing should take to reach a certain temperature, or to finish your project.

  • Estimate when a segment will reach a target temperature during the fusing process.

  • Estimate the total time for the entire firing from start to finish.

  • Always add notes and pictures to remind you of what happened during firing.


    • Remember when firing your pieces:

    1. Glass needs to be ¼” thick. If you begin with a piece that you stacked up an inch or more, it is going to flatten out and get wider so it can achieve the ¼” thickness. If you begin with several thin layers then it will pull in and rounding up to achieve the ¼” thickness. So, whenever you are heating glass to full fuse, anything with less mass will pull and shrink up, anything with more mass will flatten and spread out. You can control this movement a little by fusing at a slower rate, and not firing to a full fuse.

    2. Each kiln is different. Current loads can vary, and pyrometers can be off slightly.

    3. Use this firing log as a guide, but remember to still check your glass frequently during fusing, and make notes about changes in schedules as needed.

    4. Always prepare your kiln by applying kiln wash. Prepare your kiln shelf with kiln wash or kiln paper. And, don't forget to apply kiln wash to molds.



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