Kiln scum refers to the undesirable residue or deposit that accumulates on the interior walls and surfaces of a kiln. A kiln is a high-temperature furnace or oven that is primarily used for drying, firing, or hardening materials such as ceramics, clay, or glass.
The formation of kiln scum is a natural byproduct of the kiln firing process. When materials are heated to extreme temperatures, impurities and minerals present in the material can react with the heat, resulting in the formation of a thin layer of residue. This residue can adhere to the walls, floors, and other internal components of the kiln, hindering its efficiency and affecting the quality of the final product.
Kiln scum is typically composed of various compounds, such as oxides, carbonates, sulfates, and silicates. The specific composition of the scum depends on the materials being fired, the firing temperature, and the duration of the firing process. It is often characterized by its powdery or crust-like texture and can vary in color, ranging from white or gray to brown or black.
To maintain optimal kiln performance and prevent the accumulation of kiln scum, regular maintenance and cleaning are essential. This can involve measures such as scraping and scrubbing the interior surfaces, using specialized cleaning agents or solvents, and occasionally conducting more thorough deep cleanings. Proper kiln maintenance helps ensure consistent heat distribution, prevents contamination of materials, and prolongs the lifespan of the kiln.
