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Fried - Not Fired - PMC!

Though I have been taking a metal clay class, so far, the instructor has been firing our projects for us. I have my own kiln I use for fused glass, so I figured it was time for me to learn to fire my own metal clay and, boy, did I learn! I learned that firing PMC may not be as simple as I had imagined.


Both sources I have, which includes a booklet from Rio Grande and Tim McCreight’s Working with Precious Metal Clay, explain the firing procedures to be used:

1. First the clay should be left to dry. It can be air dried or a blow dryer may be used to speed up this process. Drying time will be different depending on the humidity. A minimum of a few hours is recommended.

2. After drying, place flat pieces of clay on a kiln shelf or fire brick and set them into the kiln. If pieces are hollow or three dimensional, it is recommended that they are placed in alumina hydrate.

3. Turn the kiln on high and close the door.

4. The temperature you need depends on the type of clay you have:

  • PMC silver should fire at 900 degrees C/1650 degrees F for two hours
  • PMC+ silver should fire at 900 degrees C/1650 degrees F for 10 minutes or 850 degrees C/1560 degrees F for 20 minutes or 800 degrees C/1470 degrees F for 30 minutes.
  • PMC gold should fire at 1000 degrees C/1830 degrees F for two hours.
  • 5. When the maximum temperature is reached, turn the dial back a little to make sure the kiln does not get any higher than the maximum temperature.

    6. Continue to heat the PMC at this temperature for two hours. The clay may be heated longer. However if it is fired for less than two hours, it may not be as strong as it should be.

    7. After two hours, turn the kiln off. Silver may either be left in the kiln to cool or taken out and quenched in water.

    So this is the process I followed, and all was going well until I reached step five - reaching my maximum temperature. Since I had silver PMC, I needed to reach a temperature of 1650 degrees F. After about one hour, my kiln did reach this temperature. At that point, I turned my kiln down a few notches. Then I set my timer to 15 minutes so I could come back and check it. That is where I made my fatal mistake. 15 minutes later, my kiln did not go down, nor did it stay at 1650. I instead, it went hirer to almost 1800 degrees F.


    What did this teach me, and what can you learn from my mistake? First, I learned that once I reach my maximum temperature, I must stay by my kiln and check it every few minutes. I also learned that if I did not already have a kiln, and I planned to primarily use a kiln for metal clay, then I would probably opt to buy a kiln that is programmable.

    Since my disaster, I’ve interrogated my metal clay teacher who has a kiln similar to mine. I’m going to try another attempt soon. Obviously, learning to fire your own clay is a critical step when learning this technique. So, be prepared to take the time to learn this important step when making your own metal clay jewelry.

    All graphics created by Tammy Powley.

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