Updates to the Instruction Manual

The Instruction Manual for Hadar’s Clay has been updated. The date marked on the title page is March 22, 2013.

There is only one main change, but it affects different parts of the Instruction Manual, especially the quick-reference firing schedules.

Since the different options for performing phase 1 (pre-firing) seemed to be confusing, there are now only two options:

1. Pre-firing on stove top with pieces resting on carbon but not covered by it;
2. Pre-firing in the kiln with pieces resting on carbon but not covered by it.

No more pre-firing for two hours in the kiln inside carbon. This method does not seem to have any advantages over the options mentioned above. Its disadvantages are:

1. It requires a long firing process;
2. Even with 2 hours inside carbon there is no telling whether the binder did or did not burn off completely.

Reminder: White Bronze and Low-shrinkage Steel XT do not require pre-firing.

14 Responses to “Updates to the Instruction Manual”

  • Ro Germaine Says:

    So the prefiring in the Kiln is not for 2 hours but until they smoke and then for an additional 15 minutes? Is that correct? This is good news.!

  • Georgie Galante Says:

    I’m not certain how long to pre-fire in the kiln, since two hours is no longer necessary. Think I read it somewhere, but can’t remember. Thanks!

  • Hadar Jacobson Says:

    Ro, Yes. Pre-fire on top of the carbon, even with the kiln door open, until all smoke is gone and pieces are black. Additional 15 minutes will help but don’t exceed one hour.

  • Hadar Jacobson Says:

    Georgie, Stove top is better, but in the kiln it’s the same deal: wait until the smoke is gone and pieces are black. Then you know the binder is gone.

  • Kelly Says:

    Hadar…the new manual says Mid-fire in muffle kilns is now 1510 degrees??
    Is this new or a typo? :). Thanks!!

  • Kerri Says:

    Hadar, I have tried burning out the binder in the kiln on top of the carbon twice. The first time it worked great but the second time one of the three pieces (a slightly curved bracelet component) cracked almost in half with additional cracks along the surface. The side that was resting on the carbon was very cracked but the side exposed to the air looked fine. I’m not sure what to change to prevent this from happening next time. Thanks!

  • Nena Says:

    There is a small mistake in temperature conversion in the Quick Reference Table, Mid-Fire Schedule, 1460F is 793C, not 890C. 🙂

  • Hadar Jacobson Says:

    Thank you! it’s all corrected now.

  • Hadar Jacobson Says:

    Kelly, It’s not a typo: 1510 for muffle, 1460 for brick.

  • Hadar Jacobson Says:

    Kerry, I would position the curved links on their side. It will also prevent them from flattening.

  • Kelly Says:

    It use to be 1520…when did it change?? I’ve been firing bronze at 1520 this entire week. Oops!

  • Ron Taylor Says:

    Hadar, when I download your Instruction Manual from either your website or your blog, the date on the cover page is February 11, 2013, not March 22, 2013. Am I doing something wrong?

  • Hadar Jacobson Says:

    Kelly, I guess you misses an update. It changed with the introduction of Brilliant Bronze, which requires 10F lower. It turns out that 1510 works fine for all mid-fire clays.

  • Hadar Jacobson Says:

    Ron, I just opened it from the blog, and it says March 22.

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