The material typically used to calibrate a porcelain furnace is a sample of the porcelain system's clearest powder, formed into discs using a lubricated metal washer from the hardware store. This method allows ceramists to test the firing cycle and adjust the furnace settings based on the translucency and texture of the ceramic.
To calibrate a porcelain furnace, experienced ceramists evaluate the parameters of translucency and texture of the ceramic by firing a sample of the porcelain system's clearest powder. An inexpensive way to make samples of clear porcelain for testing the firing cycle is to form discs of ceramic using a lubricated metal washer from the hardware store. The ceramist then examines the fired discs for sharply defined, unrounded edges and maximum clarity, and adjusts the firing cycles accordingly to achieve the desired results.
It is important to note that porcelain matures as a function of heat (time and temperature), not just end temperature. Therefore, proper calibration of the porcelain furnace is crucial for achieving optimal levels of maturity while maintaining important features of the restoration, such as surface texture, translucency, value, hue, and chroma.
In summary, the material used to calibrate a porcelain furnace is a sample of the porcelain system's clearest powder, formed into discs using a lubricated metal washer. This method allows ceramists to test the firing cycle and adjust the furnace settings based on the translucency and texture of the ceramic, ensuring optimal results for porcelain restorations.
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