Low fusing porcelain is a special type of porcelain that is fired at lower temperatures compared to standard porcelain.
This type of porcelain is particularly important in the process of fixing overglaze enamels on porcelain wares.
It prevents the discoloration of pigments that can occur at higher temperatures.
4 Key Points to Understand What is Low Fusing Porcelain
1. Purpose of Low Firing Temperatures
The primary reason for using low firing temperatures is to preserve the integrity of overglaze enamel colors.
Most enamel pigments are sensitive to high temperatures and can discolor if subjected to the temperatures required for firing the porcelain body and glaze.
By using a muffle kiln, which isolates the objects from the direct heat source, the temperature can be controlled to prevent damage to the enamels.
2. Process in Muffle Kilns
Muffle kilns are specifically designed for this purpose and are generally smaller than the kilns used for the main firing of porcelain.
The isolation of the objects from the heat source, originally achieved through the kiln's design, ensures that the temperature remains within the optimal range for the enamels.
With modern kilns using electricity, the isolation is less about preventing direct flame contact and more about precise temperature control.
3. Duration and Cooling
The firing process in a muffle kiln typically lasts between five and twelve hours, depending on the specific requirements of the enamels being used.
After the firing, the kiln is allowed to cool over a period of more than twelve hours.
This controlled cooling is essential to prevent thermal shock and to ensure that the enamels properly adhere to the porcelain surface.
4. Importance in Porcelain Furnaces
The concept of low fusing porcelain extends to other applications, such as in dental porcelain, where maintaining specific properties like translucency and color is crucial.
The calibration and operation of porcelain furnaces play a significant role in achieving the desired characteristics in the final product.
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