Burning porcelain: That's how it works


Porcelain is burned at least twice during production. Once with and once without glaze. Here you can find out at what temperatures hard and soft porcelain is fired. You can also burn porcelain yourself at home, you will also find information about it below.

The glowing fire

In the production of each porcelain, the processed and preformed mass is first fired at about 1000 degrees. This burning, in which the porcelain is mainly dried out well, is called incandescent. The porcelain remains in the kiln for 24 hours. Here, the mass shrinks by about 3%. The porcelain then has a slightly pink-gray color and has almost reached its hardness of 8 and can therefore only be processed with diamond-coated tools. However, it is still somewhat porous. Subsequently, the still hot porcelain is coated with the glaze.

The burn

In a round oven, the now glazed mass is fired a second time around 30 hours. Soft porcelain is fired at temperatures of around 1200 to 1300 degrees. Hard porcelain, however, at temperatures around 1500 degrees. Due to the high temperatures, the glaze merges inseparably with the porcelain. The result is about 20% smaller, brilliant white and slightly translucent.

What is important when burning

  • The temperature must be evenly distributed in the oven so that the porcelain heats up evenly.
  • The sulfur must evaporate in time, so that no yellow spots on the porcelain form.
  • It is also important that the second fire is carried out at higher temperatures than the first one.
  • The porcelain is burned in chamotte capsules to protect it from the smoke.

Make your own porcelain

If you want to make porcelain yourself, you need an oven that can produce temperatures around 1500 degrees. If you do not have such an oven, you can also go to a local ceramics manufacturer or pottery and ask if you can rent their oven. Alternatively, you can also simply work with cold porcelain. How this works is explained in this guide.

biscuitware

Biscuit porcelain is burned only once and is not covered with a glaze. As a result, it shines much less than conventional porcelain. Whatever else distinguishes biscuit porcelain from conventional porcelain, read here.

Tips & Tricks

Find out here how to design and paint porcelain yourself.


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