High-temperature furnaces rely on refractory materials and specific manufacturing techniques to determine their maximum operating temperatures. Ceramic fiber materials typically operate up to around 1750 degrees Celsius, although they can withstand up to 1800 degrees Celsius, ensuring stable performance in practical applications. Foam ceramics, designed for temperatures as high as 1800 degrees Celsius, offer excellent thermal insulation and resistance to thermal shock in high-temperature environments. Selecting the appropriate refractory material is essential to ensure safe and efficient operation of high-temperature furnaces across diverse industrial and scientific applications.