Sleeves are made by continuous weaving of basalt fiber. They can be processed and surface-treated once applied. Their outstanding electrical insulation, high temperature resistance and resistance to chemical corrosion, make them the best choice in the exposed parts of electrical appliance, internal connection cables and insulating pipes in all kinds of thermojunction parts. They can also be used as base materials for piping, high-temperature resistant composite piping such as automobile mufflers, and fire extinguishers. They replace carbon sleeves in the medical industry for prosthetic technology.