Basalt fiber casing is made by processing and surface treatment of high-quality basalt fibers. Basalt fibers are hailed as "the new material of the 21st century". They have excellent resistance to high and low temperatures, are resistant to acids and alkalis, corrosion-resistant, have good moisture absorption, good insulation, excellent high-temperature filtration properties, radiation resistance, etc. They are widely used in aviation, aerospace, military industry, high-speed rail, automobiles and other fields. It operates normally within the temperature range of -260℃ to 1200℃.