Refractory clay is a type of clay that is highly resistant to heat and can withstand high temperatures. It is commonly used in the production of ceramics, bricks, and other heat-resistant materials. Some common synonyms for refractory clay include fire clay, heat-resistant clay, and high-temperature clay. Refractory clay is highly sought after due to its unique properties, such as its ability to maintain its shape and structural integrity even when exposed to extreme heat. It is often used in industrial settings where high temperatures are a regular part of the production process, such as steel mills, foundries, and glass factories.